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习题练习:DC Circuits



 作者: admin发布日期: 2025-05-16 08:25   总分: 111分  得分: _____________

答题人: 匿名未登录  开始时间: 25年05月16日 08:25  切换到: 整卷模式

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1#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Explain why birds can sit l)e9rx5 6x(m-u8q tmemrcmw 1 on power lines safely, whereas leaning a metal ladder up against a power line to fetch a stuck kite is extrux 9 mw-(ce 1m 5rq8lx)mmetr6emely dangerous.
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2#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Discuss the advantages and dismos9 w43 :sk;at wstr1advantages of Christmas tree lights connected in parallel versus those cos:swrt3 m4 9a ;tsowk1nnected in series.
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3#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If all you have is a 120-V line, would it be possible to light sev wyzc6- wbg.do5 6xr)xvv 35jseral 6-V lamps without burg vy3 jvcwxz rswb5x66d-o) .5ning them out? How?
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4#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Two lightbulbs of reopd ru2* dx; tz/8pjzi xnm8:)sistance $R_1$ and $R_2(R_2>R_1)$ are connected in series. Which is brighter? What if they are connected in parallel? Explain.
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5#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Household outlets are often double outlets. Are these connected in series or p 9.8-pdvhnof6dbz k w+arallel? Hb.9-ndw 6d8fp +zhvok ow do you know?
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6#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
With two identical lightbulbs and two identical batteries, how wo3h4eacd*w7hap y8dx0o 7;s1j pi9xpo uld you arrange the bulbs and batteries in a circuit to get thhi oa*4h8;9p 7 odp d0x jaeswyx7c13pe maximum possible total power out? (Assume the batteries have negligible internal resistance.)
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7#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If two identical resistors are connected64l7enq 2pu tixfpvk20 :zo6v in series to a battery, does the battery have to supply more power or less power than when only one of the resistors is co7p4v2o ti l:vnx66 p 0ezf2ukqnnected? Explain.
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8#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
You have a single 60-W bulb on in your room. How does the overall resistance oi 0 9xvk;ii0aof your room’s electric circuit chii0ai ovk90;x ange when you turn on an additional 100-W bulb?
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9#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
When applying Kirchhoff’s loop rule (such as in Fig. Below), does the sign /3o whdd :th56hx2pqt (or direction) of a battery’s emf depend on the direction of current through the batteryh32/wt :o 5dhq dtpxh6? What about the terminal voltage?

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10#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Given the circuit shown in Fig. 19–36, use the words “increas:ygakm (g y5xqn)*8ae6r5una es,” “decreases,” or “stays the same” to complete the following state)r m5an6aa(*kyg y:q8xn ug5e ments:
(a) If $R_7$ increases, the potential difference between A and E   . Assume no resistance in Ann meter and power supply.
(b) If $R_7$ increases, the potential difference between A and E   . Assume Ann meter and power supply have resistance.
(c) If $R_7$ increases, the voltage drop across $R_4$   .
(d) If $R_2$ decreases, the current through $R_1$   .
(e) If $R_2$ decreases, the current through $R_6$   .
(f) If $R_2$ decreases, the current through $R_3$   .
(g) If $R_5$ increases, the voltage drop across $R_2$   .
(h) If $R_5$ increases, the voltage drop across $R_4$   .
(i) If $R_2$,$R_5$, and $R_7$ increase, power supply (r = 0)   .



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11#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
For what use are batteries connected in series? For what use are they n 3cm/-khia9aconnected in parallel? Does it matter if the batteries are nearly identical or non-k a9/3ic hamt in either case?
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12#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can the terminal voltage of a battery ever exceed,6qap , isb gkuem*5d, its emf? Explain.
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13#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Explain in detail how you could measure thet5+vt5m -mx tb internal resistance of a battery.
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14#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Compare and discuss )wwl4i e)iob 5the formulas for resistors and for capacitors when connected in serieseo)ww5 biil )4 and in parallel.
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15#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Suppose that three identical 4gr0mq yj,dr1xpd :fvarm +y 67ni37qcapacitors are connected to a battery. Will they store myr ,0q61 :ar7gy4q+fm7dn v3rixm pjdore energy if connected in series or in parallel?
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16#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Why is it more dangerous to turn on an electdong+a l:tg 12e -dgq0ric appliance when you are standing outside in bare feet than when you are inside wearing shoes wdaq:+t ngggl d0 o2-1eith thick soles?
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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
(Fig. Below) is a diah+h4m 3kai*g-,vxy nogram of a capacitor (or condenser) microphone. The changing air pressure in a sound wave ca -h, i*y4x+mg3okanvhuses one plate of the capacitor C to move back and forth. Explain how a current of the same frequency as the sound wave is produced.
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Design a circuit in which two differehlh pqu0esr*d4q8kmh 6(g cz( l;a6(qnt switches of the type shown in (Fig. Below) can be used to operate the same lightbulb from opposite*d 4;6emg (hqq8c0la h(zp (rqhuksl6 sides of a room.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
In an RC circuit, current flows from the battery until e rh go7sm.c7gqu qg:9h0mg:* the capacitor is completely charged. Is the total energy supplied by the battery. ggh s79:*orhe7gc0:g qmq mu equal to the total energy stored by the capacitor? If not, where does the extra energy go?
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20#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
What is the main difference between an analsq2vk k c0n,0e f.y lgom1c:x6og voltmeter and an analog ammeter?
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21#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
What would happen if you mistakenly used an ammeter where you needed tp7h+,a,w:q2fgn am4s6m )n um ok orh-o use a vo q, h4 a+n,fnm62 7)m:kswmpgaohu-or ltmeter?
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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Explain why an ideal ammeter woul5u,ln0 gv2fe2jggb m0d have zero resistance and an ideal voltmeter infinite u0 nmegbggl50,fjv 22resistance.
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23#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A voltmeter connecte 3)g w:-pu r.mny)jiasmsm )/sd across a resistor always reads less than the actual voltags.)jw g i-m3 :as/)s)mrnpyume across the resistor when the meter is not present. Explain.
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24#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A small battery-operated flasvodds(d8qpd7 y1rx w;u5r ( 7ohlight requires a single 1.5-V battery. The bulb is barely glowing, but when you take the battery out d r u751yd7 ;(ddovsrxwo(pq8and check it with a voltmeter, it registers 1.5 V. How would you explain this?
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25#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the terminal voltage for a battery with an internal resistans, nh e/2vp;j7ogg agdyz+i+*ce of $0.900\Omega$ and an emf of $8.50\,V$ when the battery is connected in series with
(a) an $81.0-\Omega$ resistor,    V
(b) an $810-\Omega$ resistor.    V

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26#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Four $1.5-V$ cells are connected in series to a $12-\Omega$ lightbulb. If the resulting current is $0.45\,A$, what is the internal resistance of each cell, assuming they are identical and neglecting the wires?    $\Omega$

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27#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the internal resmbi 48voqu.0pl0,-r1r2dsv8 dori kc istance of a $12.0-V$ car battery whose terminal voltage drops to $8.4\,V$
when the starter draws $75\,A$?    $\Omega$
What is the resistance of the starter?    $\Omega$

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28#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $1.5-V$ dry cell can be tested by connecting it to a low-resistance ammeter. It should be able to supply at least $22\,A$. What is the internal resistance of the cell in this case, assuming it is much greater than that of the ammeter?    $\Omega$

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29#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Four $240-\Omega$ lightbulbs are connected in series.
What is the total resistance of the circuit?    $\Omega$
What is their resistance if they are connected in parallel?    $\Omega$

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30#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three $45-\Omega$ lightbulbs and three $75-\Omega$ lightbulbs are connected in series.
(a) What is the total resistance of the circuit?    $\Omega$
(b) What is their resistance if all six are wired in parallel?    $\Omega$

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31#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $650-\Omega$ and a $2200-\Omega$ resistor are connected in series with a $12-V$ battery. What is the voltage across the $2200-\Omega$ resistor?    V

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32#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Given only one $25-\Omega$ and one $35-\Omega$ resistor, list all possible values of resistance that can be obtained.    $\Omega$    $\Omega$    $\Omega$    $\Omega$

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33#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you have a kojeh57 gap+ uwzyj:a09 xx.- -c0ots$680-\Omega$, a $940-\Omega$ and a $1.20-k\Omega$ resistor. What is
(a) the maximum,    $\Omega$
(b) the minimum resistance you can obtain by combining these?    $\Omega$

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34#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Suppose that you have a+pv3rse62v7uza q q d) $6.0-V$ battery and you wish to apply a voltage of only $4.0\,V$. Given an unlimited supply of $1.0-\Omega$ resistors, how could you connect them so as to make a “voltage divider” that produces a $4.0-V$ output for a $6.0-V$ input?
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35#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three $240-\Omega$ resistors can be connected together in four different ways, making combinations of series and/or parallel circuits. What are these four ways, and what is the net resistance in each case?
The resistors can all be connected in series   $\Omega$
The resistors can all be connected in parallel.   $\Omega$
Two resistors in series can be placed in parallel with the third.   $\Omega$
Two resistors in parallel can be placed in series with the third.    $\Omega$

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36#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A battery with an emf :lrhx19x tmry5ug6c/ of $12.0\,V$ shows a terminal voltage of $11.8\,V$ when operating in a circuit with two lightbulbs rated at $3.0\,W$ (at $12.0\,V$) which are connected in parallel. What is the battery’s internal resistance?    $\Omega$

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37#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Eight identical lights arqo hvzrt4f4j0r am 4)qel*orhw s3-: ,e connected in series across a $110-V$ line.
(a) What is the voltage across each bulb? V$\approx$    V(Round to the nearest integer)
(b) If the current is $0.50\,A$, what is the resistance of each bulb, and what is the power dissipated in each?
R $\approx$    $\Omega$(Round to the nearest integer)
P $\approx$    W(retain one decimal places)

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38#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Eight lights are connected zzm.h:y fa,csos.+pi ,6qyx5 in parallel to a $110-V$ source by two long leads of total resistance $1.6-\Omega$. If $240\,mA$ flows through each bulb, what is the resistance of each, and what fraction of the total power is wasted in the leads?
$V_R $ =    $\Omega$
firaction wasted =   

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39#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Eight $7.0-W$ Christmas tree lights are connected in series to each other and to a $110-V$ source. What is the resistance of each bulb?    $ \Omega$

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40#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A close inspection of an electric ci135zaabj8o 74xjinkx rcuit reveals that a $480-\Omega$ resistor was inadvertently soldered in the place where a $320-\Omega$ resistor is needed. How can this be fixed without removing anything from the existing circuit?    $\Omega$

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41#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Determine
(a) the equivalent resistance of the circuit shown in (Fig. Below),
$R_{eq}$ =   $\Omega$
$V_{470}$ =    V
(b) the voltage across each resistor. $V_{parallel}$    V



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42#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $75-W$, $110-V$ bulb is connected in parallel with a 40-W, 110-V bulb. What is the net resistance?    $\Omega$(Round to the nearest integer)

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43#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the network of resistors shown in (Fig. Below). Answer qua/rbm /ts ;21yf pwmqdw*2sk6zlitatively: //dwbpms wm 2f;r16kqzt y*2s
(a) What happens to the voltage across each resistor when the switch S is closed? $V_1$    $V_2$    $V_3$    $V_4$  
(b) What happens to the current through each when the switch is closed? $V_1$    $V_2$    $V_3$    $V_4$  
(c) What happens to the power output of the battery when the switch is closed?  
(d) Let $R_1=R_2=R_3=R_4=125\Omega$ and $V\,=\,22.0\,V$. Determine the current through each resistor before and after closing the switch. Are your qualitative predictions confirmed? Notice that the current through each of the parallel resistors is half of the total current, within the limits of significant figures. $I_1$ =    A $I_3$ =    A $I_4$    A Notice that the current through each of the parallel resistors is one third of the total current, within the limits of significant figures.$I_1$ =    A $I_2$ =    A $I_3$ =    A $I_4$ =    A  



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44#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the net resistance z ptpe r(::;okof the circuit connected to the battery in (Fig. Below)? Et :zppo:(;erk ach resistance has $R\,=\,2.8K\Omega$.   k$\Omega$(retain one decimal places)


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45#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three equal resistors (R) are connected c6u xd:4dyl6e1 lm2hfqy7um, to a battery as shown in (Fig. Below). Qual4 6,u2dmx hydlm76lfuqye :c1itatively, what happens to
(a) the voltage drop across each of these resistors, $V_{left}$    $V_{right}$    $V_{right}$  
(b) the current flow through each, $I_{left}$    $I_{right}$    $I_{right}$  
(c) the terminal voltage of the battery, when the switch S is opened, after having been closed for a long time? terminal voltage  
(d) If the emf of the battery is 15.0 V, what is its terminal voltage when the switch is closed if the internal resistance is $0.50\Omega$ and $R\,=\,5.5\Omega$?
$V_{terminal\,closed}$ =    V
(e) What is the terminal voltage when the switch is open? $V_{terminal\,closed}$ =    V



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46#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $2.8-k\Omega$ and a $2.1-k\Omega$ resistor are connected in parallel; this combination is connected in series with a $1.8-k\Omega$ resistor. If each resistor is rated at $\frac{1}{2}W$ (maximum without overheating), what is the maximum voltage that can be applied across the whole network?    V

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47#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the currentd5qq 9v1rhc;s in the circuit of (Fig. Below) and show that the sum of all the voltage changes around the circuit v5drqq 91; schis zero.
I $\approx$    A(retain two decimal places)
$\sum$ =    V


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48#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Determine the terminal voltage of each battery in (Fig. Bel ildw8az.:*cxxv m*0b ow). 18V battery =    V 12V battery =    V


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49#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  (a) What is the pote5eq3m,xzd5km ntial difference between points a and d in (Fig. Below a) (same 5mx 53qedk,mzcircuit as Fig. Below b, ), $V_{ad}$    V
(b) what is the terminal voltage of each battery?
80V battery =    V
45V battery =    V

a
b

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50#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For the circuit shown in (Fig. Below), find the polp4mm7w p*9ys tential difference between points w mm*9pl4 7spya and b. Each resistor has $R\,=\,75\Omega$ and each battery is 1.5 V.    V


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51#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Determine the magnit n(ocqap-*f 1(hk7/0jsq wna budes and directions of the currents through $R_1$ and $R_2$ in (Fig. Below). $I_1$    A    $I_2$    A  


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52#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Repeat Problem 27, now as po;h xzcl-4 n,o08l2mniz5 qzsuming that each battery has an internal resistance $r\,=\,1.2\Omega$.
$I_1$ $\approx$    A   (retain two decimal places)
$I_2$ $\approx$    A    (retain two decimal places)
$I_3$ $\approx$    A    (retain two decimal places)

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53#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Determine the magnitudes ajjk1nw goa55+ nd directions of the currents in each resistor shown in (Fig. Below). The battkj51 5n+awo gjeries have emfs of $E_1\,=\,9.0V$ and $E_2\,=\,12.0V$ and the resistors have values of $R_1\,=\,25\Omega$,$R_2\,=\,18\Omega$, and $R_3\,=\,35\Omega$
$I_1$ $\approx$    A   (retain two decimal places)
$I_2$ $\approx$    A    (retain two decimal places)
$I_3$ $\approx$    A    (retain two decimal places)


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54#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Repeat Problem 29, assuming each battery has internal resistance *-dmq3oi6y v,plvmdjj/8r) u$r\,=\,1.0\Omega$.
$I_1$ $\approx$    A   (retain two decimal places)
$I_2$ $\approx$    A    (retain two decimal places)
$I_3$ $\approx$    A    (retain two decimal places)

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55#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the currents in each resistor of (Fig. Bekl+pzay8t/n no)tkt* i;(v/mx +iu 7 jlow).
$2\Omega$    A
$6\Omega$    A
$8\Omega$    A
$10\Omega$    A
$12\Omega$    A


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56#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  (a) Determine the cun,xc. -g ge5harrents $I_1$,$I_2$, and $I_3$ in (Fig. Below). Assume the internal resistance of each battery is $r\,=\,1.0\Omega$$I_1$ $\approx$    A(retain two decimal places)
$I_2$ $\approx$    A (retain two decimal places)
$I_3$ $\approx$    A (retain three decimal places)
(b) What is the terminal voltage of the 6.0-V battery? $V_{terminal}$    V


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57#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What would the current bjyo**kkffc c(:8w 6cn u /hri;jn8 0z$I_1$ be in (Fig. Below) if the $12-\Omega$ resistor is shorted out? Let $r\,=\,1.0\Omega$. $I_1$    A


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58#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose two batteries, with unequal emfs of 2.00 V and 3.00 V, are 8xpm *khw us4a45 9b ,epfv(ddb*r.gsconnected as shown in (Fig. Below). If each internal resistm,5bp.gh 94 wr4edxavs b sf*(u*pkd8 ance is $r\,=\,0.100\Omega$ and $R\,=\,4.00\Omega$, what is the voltage across the resistor R? $V_R$ $\approx$    V (retain two decimal places)



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59#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  (a) Six $4.7-\mu F$ capacitors are connected in parallel. What is the equivalent capacitance? $C_{eq}$ =    $\mu F$
(b) What is their equivalent capacitance if connected in series? $C_{eq}$ =    $\mu F$

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60#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You have three capacitorzy lov p::yu-5s, of capacitance 3200 pF, 7500 pF, and $0.0100\mu F$ . What maximum and minimum capacitance can you form from these? How do you make the connection in each case?
$C_{max}$ =    $ \times10^{-8 }\;F$ in  
$C_{min}$ =    $ \times10^{-9 }\;F$ in  

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61#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $3.00-\mu F$ and a $4.00-\mu F$ capacitor are connected in series, and this combination is connected in parallel with a $2.00-\mu F$ capacitor (see Fig. Below). What is the net capacitance? $C_{eq}$ =    $\mu F$


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62#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If 26.0 V is applied across the whole network of (Fig. Below), ca)hpf4t)co9/bi l7 :kra (qvyqlculate the volbol:t9c) 4/ hpiya7(f q)k rqvtage across each capacitor.
$V_{2.00}$ =    V
$V_{3.00}$ =    V
$V_{4.00}$ =    V



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63#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitance of a portion of a circuit is to be reduced frh/zn gj; /b3etk*: ;k1itiypt9c; igrom 4800 pF to 2900 /pit gtzk ;nj i ;bthrcg1/3*ke;i9:ypF.
What capacitance can be added to the circuit to produce this effect without removing existing circuit elements?    $ \times10^{ -9}\;F$
Must any existing connections be broken in the process?  

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64#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric circuit was accidentaltvmzi727tux z/fpy0 2 ly constructed using a $5.0-\mu F$ capacitor instead of the required $16-\mu F$ value. Without removing the $5.0-\mu F$ capacitor, what can a technician add to correct this circuit?
   $\mu F$
conneected in  

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65#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Determine the equivalent capaciudtd)zqh;;w hzm5pps jcs1 / 0;h(p-c tance of the circuit shown in (Fig. Below).
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66#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In (Fig. Below), if 7,ax j1df(vg ;gn d)s1zzmk5 go ;y.io$C_1=C_2=2C_3=22.6\mu F$, how much charge is stored on each capacitor when $V\,=\,45.0V$?
$Q_1$   $ \times10^{-3 }\;C$
$Q_2$   $ \times10^{-4 }\;C$
$Q_3$   $ \times10^{-4 }\;C$



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67#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In (Fig. Below), supp nh;4nqo k8o 9+0wgc2aqp xuj*ose $C_1=C_2=2C_3=16.0\mu F$, If the charge on $C_2$ is $Q_2\,=\,24.0\,\mu C$, determine the charge on each of the other capacitors, the voltage across each capacitor, and the voltage V across the entire combination.
$ Q_{1}$ =    $\mu C$, $V_{1}$=   V
$ Q_{2}$ =    $\mu C$, $ V_{2}$=    V
$ Q_{3}$ =   $\mu C$, $ V_{3}$=    V
V=    V


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68#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In (Fig. Below), letxemtw3b2 0psk/on(euc5 m +5 rw8.ru:qh;har $V\,=\,78V$ and $C_1=C_2=2C_3=7.2\mu F$. How much energy is stored in the capacitor network?    $ \times10^{-2 }\;J$


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69#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A $0.40-\mu F$ and a $0.60-\mu F$ capacitor are connected in series to a 9.0-V battery. Calculate
(a) the potential difference across each capacitor,
$V_1$ =    V
$V_2$ =    V
(b) the charge on each. $Q_1$ =    $ \times10^{-6 }\;C$
(c) Repeat parts (a) and (b) assuming the two capacitors are in parallel.
$V_1$ =    V
$V_2$ =    V
$Q_1$ =    $ \times10^{-6 }\;C$
$Q_2$ =    $ \times10^{-6 }\;C$

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Three conducting plates, each o ,a ;kz,3vw+vh jwkyb5f area A, are connected as shown in (Fig. Below). vw; 5 ky hwv,z3kj,+ba
(a) Are the two capacitors formed connected in series or in parallel?
(b) Determine C as a function of $d_1$,$d_2$, and A. Assume $d_1+d_2$ is much less than the dimensions of the plates.
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71#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circuit contains a single 250-pF capacitor hooked across a battery. It )nsst((kw0qc is desired to store three times ()tk(0wq s sncas much energy in a combination of two capacitors by adding a single capacitor to this one.
How would you hook it up? 
what would its value be?    pF

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72#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 185-pF capacitor is connected in series with an unknown capacbge+u /ek4 9qxitance, and as a series combination tk +49/qexube ghey are connected to a battery with an emf of 25.0 V. If the 185-pF capacitor stores 125 pC of charge on its plates, what is the unknown capacitance?    pF

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73#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electrocardiographs are often connected as shown in (Fig. Below). The l/8o ivor:bho oh4e6d m9+lay: eads are said to be capacitively coupled. A time constant of 3.0 9ol+omi ayr:6h4vo:oeb8h/ds is typical and allows rapid changes in potential to be recorded accurately. If $C\,=\,3.0\mu F$, what value must R have? [Hint: consider each leg as a separate circuit.]    $ \times10^{6 }\;\Omega$


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74#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. Below a (same ag mb,*2 nenwt30fbu sc;ze:-m s Fig. Below b), the total resistance is $15.0k\Omega$, and the battery’s emf is 24.0 V. If the time constant is measured to be $35.0\mu s$, calculate
(a) the total capacitance of the circuit    $ \times10^{-9 }\;F$
(b) the time it takes for the voltage across the resistor to reach 16.0 V after the switch is closed.    $ \times10^{-5 }\;s$

a
b

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75#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The RC circuit of Fig. Below a (same as Fig. Belhj z+;fz i e/ 0uyk1w:v/w4nlv -dpqz2ow b) has $R\,=\,6.7k\Omega$ and $C\,=\,3.0\,\mu F$. The capacitor is at voltage $V_0$ at $t=0$. when the switch is closed. How long does it take the capacitor to discharge to 1.0% of its initial voltage?    $ \times10^{ -2}\;s$
a
b

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76#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two resistors and two uncharged capacitors arenti0 7fd.,nbkuc )ih ( arranged as shown in (Fig. Below). Then a potential difn nh,.dbf(ui kt)7c0i ference of 24 V is applied across the combination as shown.
(a) What is the potential at point a with switch S open? (Let $V=0$ at the negative terminal of the source.)    V
(b) What is the potential at point b with the switch open?    V
(c) When the switch is closed, what is the final potential of point b?    V
(d) How much charge flows through the switch S after it is closed?    $\mu F$


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77#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resistance of a voltmeter on the 250-V scale if the meter sensi 2hhbbm/c b270rggsvd2(py* ativity is *c2y b(rvbhh ggp07 2sd2/mba$30,000\,\Omega/V$?    $ \times10^{6 }\;\Omega$

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78#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ammeter has a sensitivik:k. zti.88e oqzf0fiyxp8 +cr1w yq8ty of $20,000\,\Omega/V$? What current in the galvanometer produces full-scale deflection?    $\mu A$

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79#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A galvanometer has an i6a3esq an 4f:fpby)b,nternal resistance of $30\Omega$ and deflects full scale for a $50-\mu A$ current. Describe how to use this galvanometer to make
(a) an ammeter to read currents up to 30 A,    $ \times10^{-5 }\;\Omega$
(b) a voltmeter to give a full-scale deflection of 250 V.    $ \times10^{6 }\;\Omega$

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80#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A galvanometer has a sensy drwvi7cr.h *7.q:b i4bt 7ffitivity of $35k\Omega/V$ and internal resistance $20.0\Omega$. How could you make this into
(a) an ammeter that reads 2.0 A full scale,
   $ \times10^{-4 }\;\Omega$ in
 
(b) a voltmeter reading 1.00 V full scale?
   k$\Omega$
 

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81#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A milliammeter reads 10 mA full scale. It /jys+fc t-h)r8az 5r5 f k)d4os)yigb consists of a $0.20-\Omega$ resistor in parallel with a $33-\Omega$ galvanometer. How can you change this ammeter to a voltmeter giving a full-scale reading of 10 V without taking the ammeter apart? What will be the sensitivity ($\Omega/V$) of your voltmeter?
$R_{ser}$ $\approx$    $\Omega$(Round to the nearest integer)
The sensitivity is    $\Omega/V$

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82#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 45-V battery of negli5- pk0 n7j3x:tchcv7l5r zyragible internal resistance is connected to a $R_1$=$38-k\Omega$ and a $R_2$=$27-k\Omega$ resistor in series. What reading will a voltmeter, of internal resistance $95k\Omega$ give when used to measure the voltage across each resistor? What is the percent inaccuracy due to meter resistance for each case?
$V_1$$\approx$    V (retain one decimal places) % error    % too  
$V_2$$\approx$    V (Round to the nearest integer) % error    % too  

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83#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ammeter whose internal resistan;bpvcw f9 n6k- gmt4l,ce is $63\Omega$ reads 5.25 mA when connected in a circuit containing a battery and two resistors in series whose values are $750\Omega$ and $480\Omega$. What is the actual current when the ammeter is absent?    $ \times10^{ -3}\;A$

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84#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A battery with $E\,=\,12.0V$ and internal resistance $r\,=\,1.0\Omega$ is connected to two $9.0-k\Omega$ resistors in series. An ammeter of internal resistance $0.50\Omega$ measures the current, and at the same time a voltmeter with internal resistance $15k\Omega$ measures the voltage across one of the $9.0-k\Omega$ resistors in the circuit. What do the ammeter and voltmeter read?
$I_{source}$   $ \times10^{ -4}\;A$
$V_{meter}$    V

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85#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two $9.4-k\Omega$ resistors are placed in series and connected to a battery. A voltmeter of sensitivity $1000\Omega/V$ is on the 3.0-V scale and reads 2.0 V when placed across either resistor. What is the emf of the battery? (Ignore its internal resistance.) $\approx$    V(Round to the nearest integer)

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86#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What internal resistance should the voltmeter of Example 19–15 have to be*ja (wepo 4 ,wl)mnllax ;bz;/ in error lb l;;nxwm)4je , *(zwal/ oapby less than 3%? $\approx$    k$\Omega$

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87#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When the resistor R in m a,s wgg dew288o:n:n(Fig. Below) is $35\Omega$, the high-resistance voltmeter reads 9.7 V. When R is replaced by a $9.0-k\Omega$ resistor, the voltmeter reading drops to 8.1 V. What are the emf and internal resistance of the battery?
r $\approx$    $\Omega$(retain one decimal places)
$\varepsilon$ $\approx$   V(retain one decimal places)



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88#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to apply a 0.25-V potential difference b ,dwofw;2ks2 f6 hrdiw +z2phwo03hw 0etween two points on the huh3 wo d;2wwi0zr +k f22w6pwhs odh,f0man body. The resistance is about $2000\Omega$, and you only have a 9.0-V battery. How can you connect up one or more resistors to produce the desired voltage?    k$\Omega$

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89#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A three-way lightbulb can produce 50 W, 100 W, or 150 W, at 1o 2qh4ntah f);20 V. Such a bulb contains two filaments that c aqon)2t ;h4fhan be connected to the 120 V individually or in parallel.
(a) Describe how the connections to the two filaments are made to give each of the three wattages.
50 W output use  
100 W output use  
150 W output use  
(b) What must be the resistance of each filament?
$R_{50W}$    $\Omega$
$R_{100W}$    $\Omega$

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90#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose you want to run some appara4wpr)pz3f-w8yyl/lo cvb;6h ; )hepetus that is 95 m from an electric outlet. Each of the wz6 l/ fbo)8e hc);p;rphl4 eyw-pwv3yires connecting your apparatus to the 120-V source has a resistance per unit length of $0.0065\Omega/m$. If your apparatus draws 3.0 A, what will be the voltage drop across the connecting wires and what voltage will be applied to your apparatus?
$V_{wires}$    V
the voltage applied to the apparatus is $\approx$    V(Round to the nearest integer)

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91#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electricity can be a hazard in hf, enwldtuy0h* h 2i0q7wirp3v 4v8h,ospitals, particularly to patients who are connected to electrodes, such as an ECG. For example, suppose that the motor of a motorized bed shorts out to the bed frame, and the bed frame’s connection to a 7rv2,hfh0u0 43teyw* ph,i liwv8qnd ground has broken (or was not there in the first place). If a nurse touches the bed and the patient at the same time, she becomes a conductor and a complete circuit can be made through the patient to ground through the ECG apparatus. This is shown schematically in Fig. 19–60. Calculate the current through the patient. $\approx$    $ \times10^{-3 }\;A$(retain three decimal places)


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92#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy must a 45h9 jxy-x(jfa 3-V battery expend to charge a $0.40-\mu F$ and a $0.60-\mu F$ capacitor fully when they are placed
(a) in parallel,    $ \times10^{-3 }\;J$
(b) in series?    $ \times10^{-4 }\;J$
(c) How much charge flowed from the battery in each case?
$Q_a$ =    $\mu C$
$Q_b$ $\approx$    $\mu C$(Round to the nearest integer)

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93#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A heart pacemaker is designed to operate at 72 beats/mt8(-icme:b8mjwp rw ,(wt* x gin using a $7.5-\mu F$ capacitor in a simple RC circuit. What value of resistance should be used if the pacemaker is to fire (capacitor discharge) when the voltage reaches 63% of maximum?    $ \times10^{-5 }\;\Omega$

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94#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a person’s body(xtnsb 1o ode- 321ur.z x0znj resistance is $950\Omega$
(a) What current passes through the body when the person accidentally is connected to 110 V?   A
(b) If there is an alternative path to ground whose resistance is $45\Omega$, what current passes through the person?   A
(c) If the voltage source can produce at most 1.5 A, how much current passes through the person in case (b)? $\approx$    mA(retain three decimal places)

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95#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A Wheatstone bridge is a type of “*c)d1midg u). ey qlelu49hz2bridge circuit” used to make measurements of resistance. T hz*u1elqed l24mydg.) i9c)u he unknown resistance to be measured, $R_x$, is placed in the circuit with accurately known resistances $R_1$ ,$R_2$, and $R_3$(Fig. Below). One of these, $R_3$, is a variable resistor which is adjusted so that when the switch is closed momentarily, the ammeter Ann Meter shows zero current flow.
(a) Determine $R_x$ in terms of $R_1$ ,$R_2$, and $R_3$.
(b) If a Wheatstone bridge is “balanced” when $R_1\,=\,630\Omega$,$R_2\,=\,972\Omega$, and $R_3\,=\,42.6\Omega$, what is the value of the unknown resistance?    $\Omega$



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96#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An unknown length of platinum wire 0.9p0:kffu/13 vqnpj vdtm *k,:v20 mm in diameter is placed as the unknown resistance in*vfnv 0kp/ fp1ud,:jq: 3mt vk a Wheatstone bridge (see Problem 71;Fig. Below). Arms 1 and 2 have resistance of $38.0\Omega$ and $46.0\Omega$ respectively. Balance is achieved when $R_3$ is $3.48\Omega$ How long is the platinum wire?    m


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97#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
What are the values of effective capacitance which can be obtained by 8 pn4n21ibu*bvy/)cig gj5 afms.o9qconnecting four identical capacitors, each4*8y1u/2oinjp sg maqg 5b 9cn.iv)bf having a capacitance C?
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98#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The variable capacitance of an old radio tuner consists of four plates co x+k +s(gwi8qnwj:g)m nnected together placed alternately between four other plates, also connected together (Fig. Below). Each ngjw:)+8 ksg+( mxiq wplate is separated from its neighbor by 1.5 mm of air. One set of plates can move so that the area of overlap of each plate varies from $2.0cm^2$ to $9.5cm^2$
(a) Are these seven capacitors connected in series or in parallel?  
(b) Determine the range of capacitance values. from    pF to    pF



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99#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A battery produces 40.8 V when 7.40 A is drawn fldpjz :l xwqm3o5k32, rom it and 47.3 V when 2.20 A is drawn. What are the emf and internal re32z:jm 5 ,xdqpl olk3wsistance of the battery?
r =    $\Omega$
$\varepsilon$ =    V

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100#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many $\frac{1}{2}-W$ resistors, each of the same resistance, must be used to produce an equivalent $2.2-k\Omega$, $3.5-W$ resistor?    $\Omega$ resistors, each rated at ½ W, in  
What is the resistance of each, and how must they be connected? Do not exceed $P\,=\,\frac{1}{2}W$ in each resistor.    k$\Omega$ resistors, each rated at ½ W, in  

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101#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through the q3yoe v k o,uhi8gtm/ 4 /tsf8fpr-:2z$4.0-k\Omega$ resistor in (Fig. Below) is 3.50 mA. What is the terminal voltage $V_{ba}$ of the “unknown” battery? (There are two answers. Why?) [Hint: use conservation of energy or Kirchhoff’s rules.]
right $V_{ab}$    V
left $V_{ab}$    V



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102#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
An air-filled parallel-plate capacitor has capacitgu3 (0 mnmo:3gx) qtahance $C_0$. If two identically sized dielectric slabs of dielectric constants $K_1$ and $K_2$ are inserted as shown in Fig. 19–64, what is the new capacitance? [Hint: treat this as two capacitors in combination.]
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103#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For the circuit shown inr(-t1ux8mx 6j/gp phm (Fig. Below), determine
(a) the current through the 14-V battery $I_1$ =    $ \times10^{-5 }\;A$ 
(b) the potential difference between points a and b, $V_a-V_b$ =    V



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104#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A solar cell, 3.0 cm square, has an output of 350 mA at p;.ckzb km-/m0.80 V when exposed to full sunlight. A so;c/b pkmmkz-.lar panel that delivers close to 1.0 A of current at an emf of 120 V to an external load is needed.
How many cells will you need to create the panel?    cells
How big a panel will you need, and how should you connect the cells to one another?    $m^2$
How can you optimize the output of your solar panel?    banks of    cells in series per bank, with the banks in    always have the panel   directly at the sun。

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105#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power supply has a fixed output v7(f fzce5bu7yoltage of 12.0 V, but you need $V_T\,=\,3.0V$ for an experiment.
(a) Using the voltage divider shown in (Fig. Below), what should $R_2$ be if $R_1$ is $10.0\Omega$? $\approx$    $\Omega$(retain one decimal places)
(b) What will the terminal voltage $V_T$ be if you connect a load to the 3.0-V terminal, assuming the load has a resistance of $7.0\Omega$? $\approx$    V(retain one decimal places)



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106#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The circuit shown in (Fig. Below a) uses a neo.*6fmlon3 bben-filled tube as in (Fig. Below b). This neon lamp nb ol b*fe3.6mhas a threshold voltage $V_0$ for conduction, because no current flows until the neon gas in the tube is ionized by a sufficiently strong electric field. Once the threshold voltage is exceeded, the lamp has negligible resistance. The capacitor stores electrical energy, which can be released to flash the lamp. Assume that $C=0.150\mathrm{~}\mu\mathrm{F},R=2.35\times10\mathrm{~}^6\Omega,V_0=90.0\mathrm{~V}$ and Ann meter=105 V
(a) Assuming that the circuit is hooked up to the emf at time $t\,=\,0$, at what time will the light first flash?    s
(b) If the value of R is increased, will the time you found in part (a) increase or decrease?  
(c) The flashing of the lamp is very brief. Why?
(d) Explain what happens after the lamp flashes for the first time.

a
b

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107#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through the c6qiid-d yfo5+h, k0t/p wo8b $20-\Omega$ resistor in (Fig. Below) does not change whether the two switches $S_1$ and $S_2$ are both open or both closed. Use this clue to determine the value of the unknown resistance R.    $\Omega$


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108#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the circuit shown izsh/ hhhb-lb):7o auw *k) d/bn (Fig. Below), the $33-\Omega$ resistor dissipates 0.50 W. What is the battery voltage? $\approx$    V(retain one decimal places)


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109#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  (a) What is the equivalent resistance of the circuit showc 8 +g5-f+yvvio ulw0 /oyc/a 0aeoc4en in (Fig. Below)? $R_{eq}$ $\approx$    $\Omega$(retain one decimal places)
(b) What is the current in the $18-\Omega$ resistor?    A
(c) What is the current in the $12-\Omega$ resistor?    A
(d) What is the power dissipation in the $4.5-\Omega$ resistor?   W



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110#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
(a) A voltmeter and an ammeter can be connected as shown in (Fig. B+w u8 zbswyynk7, 7x4nelow a) to measure a resistance R. If V is the voltmeter reading, and I is the ammeter reading, the v,yxyz+su4 7 w8kbnn7walue of R will not quite be $V/I$ (as in Ohm’s law) because some of the current actually goes through the voltmeter. Show that the actual value of R is given by
$\frac{1}{R}=\frac{I}{V}-\frac{1}{R_\mathrm{V}}$,
where $R_V$ is the voltmeter resistance. Note that $R\approx V/I\quad\mathrm{if}\quad R_\mathrm{V}\gg R$ .
(b) A voltmeter and an ammeter can also be connected as shown in (Fig. Below b) to measure a resistance R. Show in this case that
$R=\frac{V}{I}-R_\mathrm{A},$
where V and I are the voltmeter and ammeter readings and $R_A$ is the resistance of the ammeter. Note that $R_\mathrm{A}\quad\mathrm{if}\quad R\approx V/I\quad\mathrm{if}\quad
R_\mathrm{A}\ll R.$

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111#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flash lightbulb rated at 2.5,ksjr /po5r61knl i5i W and 3.0 V is operated by a 9.0-V battery. To light the bulb at its rated voltage and power, a resistor R is connected in series as shown in (Fig. Bel5/j o 15ikrklr6pi ns,ow). What value should the resistor have?    $\Omega$


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