题库网 (tiku.one)

 找回密码
 立即注册

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp,上传完成后会在上方生成预览,用鼠标连续双击缩略图,或拖动缩略图,该图片就被绑定至本题,显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片,绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


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

标记此题
1#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Explain why birds can sit on power liercu ka5ej4* j0lb m+.sjzrd+ s3;- vines safely, whereas leaning a metal ladder up against a power line jrjkji5c su3e; mbr+e4z v +l*.0sad-to fetch a stuck kite is extremely dangerous.
参考答案:    

标记此题
2#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Discuss the advantagesu6:r;vi vhh1l and disadvantages of Christmas tree lights connected in parallel versus those connected rvu hv:;1l6h iin series.
参考答案:    

标记此题
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 ga5(tykfh i ,hse4.-jh, bu3d possible to light several 6-V lamps without burning ths idh,3e4hf gtabyh k .,u(j-5em out? How?
参考答案:    

标记此题
4#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Two lightbulbs of refnhw17v lem)uv5l64usistance $R_1$ and $R_2(R_2>R_1)$ are connected in series. Which is brighter? What if they are connected in parallel? Explain.
参考答案:    

标记此题
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 orp+fsvro(wv,ro)la q2avb8l;sjb 28; parall2 vj; ,bvoq) a+ o;sf2b8(srv8p rawllel? How do you know?
参考答案:    

标记此题
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 would youwt tsm 5.r4 :q5stmxv owe(r4)6bs w.sq17awi arrange the bulbs and batteries in a circuit to get the maximum possible total power out? (Assume the batteries ssb( wwr1 so4q :w.t m745 .tirwma)sx65etvqhave negligible internal resistance.)
参考答案:    

标记此题
7#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If two identical resistors are connected in series to a batteryq 2n ikc vup-7cio n++o7(hp*v, does the battery have to supply more power or less power than when only one of-pcvivpik7 7 +hoonq( nc2 u*+ the resistors is connected? Explain.
参考答案:    

标记此题
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 res a1 -gifqrojb) xi8)6uistance of your room’s electric cirrxii8qou ) gb6-fj)1acuit change when you turn on an additional 100-W bulb?
参考答案:    

标记此题
9#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
When applying Kirchhoff’s loop rule (su, +zejktky1 fx eqr((3 kd;b+jch as in Fig. Below), does the sign (or direction) of a battery’s emf depend on the direction of current through the battery? What about the t(+ke3rf e+z b;k1j(,xy jkdtqerminal voltage?

参考答案:    

标记此题
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 word-x b-gnb h*9jns “increases,” “decreases,” or “stays the saj *hn-9b gxb-nme” to complete the following statements:
(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)   .



参考答案:     查看本题详细解析

标记此题
11#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
For what use are batteries connecd1na6 +a1cya mted in series? For what use are they connected in parall6madya n1ca+1 el? Does it matter if the batteries are nearly identical or not in either case?
参考答案:    

标记此题
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+) 4o7u2 h vkb9uyibm la92zjnxix/x8 its emf? Explain.
参考答案:    

标记此题
13#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Explain in detail how you could measure the internal resistance of a batp z tb6td yo mbtj,,(9w(i;mjgb-d*(btery.
参考答案:    

标记此题
14#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Compare and discuss the formulas for resisto pecv4d-oh gn. r8se+g+7j(usrs and for capacitors when connected in scd( sg78u ej v+ 4oge+-.nprhseries and in parallel.
参考答案:    

标记此题
15#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Suppose that three identical capacitors ar8k ;kw2z/jdze e connected to a battery. Will they store more energy if/ zje;8wkk 2zd connected in series or in parallel?
参考答案:    

标记此题
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 electric apzy 8 w*xzsl3f 94umcv:pliance when you are standing outside in bare feet than x9zmfclyz4 u: 8sv*3wwhen you are inside wearing shoes with thick soles?
参考答案:    

标记此题
17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
(Fig. Below) is a diagram of a capacitor (or condenser) micropcd yk9z cochu5 h2/.m*hone. The changing air pressure in a sound wave causes one plate of the capacitor C to move back and forth. Explain how adh 9 kc* 2mz5uocyc./h current of the same frequency as the sound wave is produced.
参考答案:    

标记此题
18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Design a circuit in which two different switches of the type shown mxsogff os)zu4,-5eip;x3/h in (Fig. Below) ca/ imxhfogp, ez-)4fx5s u;3 son be used to operate the same lightbulb from opposite sides of a room.
参考答案:    

标记此题
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 untics;e 0.pa0 jwgl the capacitor is completely charged. Is the total energy supplied by the battery equal to the total energy stored by the capacitor? If not, where does the eswc.p0a j0g; extra energy go?
参考答案:    

标记此题
20#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
What is the main difference between an analog voltmeter and an analog,i.: :ahux* r/vbdvaz ammeter?
参考答案:    

标记此题
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 whe +qv,fh) owo.xre you needed to use a voltme)o xvofh wq.,+ter?
参考答案:    

标记此题
22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Explain why an ideal ama-zv q;-keg b+meter would have zero resistance and an ideal voltmeter infinite resist ;-qv-ega+kbz ance.
参考答案:    

标记此题
23#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A voltmeter connected across a resistor always reads less than the actual volta)hx pk h1/ bsiw 30m79sk4ycusge across the 0ypkw43sxsm /u sihbc hk )917resistor when the meter is not present. Explain.
参考答案:    

标记此题
24#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A small battery-operated flashlight requires a single 1.5-V battery. Te/u) jv kto3p9he bulb is barely /juo) 3tpk9evglowing, but when you take the battery out and check it with a voltmeter, it registers 1.5 V. How would you explain this?
参考答案:    

标记此题
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 i93 d0fptz 5z y/-d;ovetv*v cqnternal resistance 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

参考答案:     查看本题详细解析

标记此题
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?    $\Omega$

参考答案:     查看本题详细解析

标记此题
27#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the internal res.x)5s9mufify4qss ,-s ok q;c 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?    $\Omega$

参考答案:     查看本题详细解析

标记此题
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?    $\Omega$

参考答案:     查看本题详细解析

标记此题
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?    $\Omega$

参考答案:     查看本题详细解析

标记此题
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?    $\Omega$

参考答案:     查看本题详细解析

标记此题
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

参考答案:     查看本题详细解析

标记此题
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.    $\Omega$    $\Omega$    $\Omega$    $\Omega$

参考答案:     查看本题详细解析

标记此题
33#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you have gk 3klqpyb:d;j :xrsl9 (l+q6 a $680-\Omega$, 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?    $\Omega$

参考答案:     查看本题详细解析

标记此题
34#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Suppose that you have a of / n6/ikl/ff$6.0-V$ 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?
参考答案:    

标记此题
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.    $\Omega$

参考答案:     查看本题详细解析

标记此题
36#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A battery with an em -egytt-ati875 oij8;p8wuj zf 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?    $\Omega$

参考答案:     查看本题详细解析

标记此题
37#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Eight identical lights are connected mwyzbv ; er.yt7(-lpo.j ,*yh)b 5bjwin 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)

参考答案:     查看本题详细解析

标记此题
38#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Eight lights are connecteddsk*dytn67. qco fio).o*jvn f4 a(c- 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 =   

参考答案:     查看本题详细解析

标记此题
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$

参考答案:     查看本题详细解析

标记此题
40#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A close inspection of an electric circuit reveals thatxm)wtzc-my72 j)onb. 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?    $\Omega$

参考答案:     查看本题详细解析

标记此题
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



参考答案:     查看本题详细解析

标记此题
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)

参考答案:     查看本题详细解析

标记此题
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). Answew9+yz )kcc.jaw zl5;m r qualitatively: zcc w)9kj5mw la.yz; +
(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  



参考答案:     查看本题详细解析

标记此题
44#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the net resistance of the circuit co i-pqhwegy ,2p.v* t-lnnected to the battery in (Fig. Below)? Each epgy.w- t2li ,-pqvh *resistance has $R\,=\,2.8K\Omega$.   k$\Omega$(retain one decimal places)


参考答案:     查看本题详细解析

标记此题
45#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Three equal resistors (R) are connected to a batmyx0;3*qto2p s6jvcm tery as shown in (Fig. Below). Qualitatively, what happen*m py ox0 6c2vs;3tqmjs 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



参考答案:     查看本题详细解析

标记此题
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

参考答案:     查看本题详细解析

标记此题
47#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the current in the circuit of (Fig. Below) and show r)ko qnt-yps(j/( w)rthat the sum of all the voltage changes around thet/w-jr nsko)(yq p (r) circuit is zero.
I $\approx$    A(retain two decimal places)
$\sum$ =    V


参考答案:     查看本题详细解析

标记此题
48#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Determine the terminal vq)4mr . /w mn4*b6y cqgpkhedgsq,j10 oltage of each battery in (Fig. Below). 18V battery =    V 12V battery =    V


参考答案:     查看本题详细解析

标记此题
49#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  (a) What is the pote8jc;*:bg giu untial difference between points a and d in (Fig. Below a) (same circuit :cjguib ;ug* 8as Fig. Below b, ), $V_{ad}$    V
(b) what is the terminal voltage of each battery?
80V battery =    V
45V battery =    V

a
b

参考答案:     查看本题详细解析

标记此题
50#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For the circuit shown 9mv65amlqk(whk5 ev3in (Fig. Below), find the potential difference between points a and hek 5km5m 6 3w9qav(vlb. Each resistor has $R\,=\,75\Omega$ and each battery is 1.5 V.    V


参考答案:     查看本题详细解析

标记此题
51#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Determine the magnitudes and directions of pzb3aqz ot)4z)+) anc1kirh2 the currents through $R_1$ and $R_2$ in (Fig. Below). $I_1$    A    $I_2$    A  


参考答案:     查看本题详细解析

标记此题
52#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Repeat Problem 27, no/bzr/nf(sk*1 h5a1i( x8h ktgclxb-ow assuming 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)

参考答案:     查看本题详细解析

标记此题
53#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Determine the magnitudes and directions of the currents in each qv , a4x vy/g7i* s;4bpzf3iocresistor shown in (Fig. Below). The battg ;v* 7a oqsyc4fb 4zpvii,/x3eries 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)


参考答案:     查看本题详细解析

标记此题
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 resg mosg 14x7lv5istance $r\,=\,1.0\Omega$.
$I_1$ $\approx$    A   (retain two decimal places)
$I_2$ $\approx$    A    (retain two decimal places)
$I_3$ $\approx$    A    (retain two decimal places)

参考答案:     查看本题详细解析

标记此题
55#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the currents in each resis5in d e -i+67opmnl9f7, nsqovtor of (Fig. Below).
$2\Omega$    A
$6\Omega$    A
$8\Omega$    A
$10\Omega$    A
$12\Omega$    A


参考答案:     查看本题详细解析

标记此题
56#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  (a) Determine the curogf 074xwn/9gexev 67r z5xvbrents $I_1$,$I_2$, 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


参考答案:     查看本题详细解析

标记此题
57#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What would the current y ibis )ko7c+.$I_1$ be in (Fig. Below) if the $12-\Omega$ resistor is shorted out? Let $r\,=\,1.0\Omega$. $I_1$    A


参考答案:     查看本题详细解析

标记此题
58#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose two batteries, wjfg feg.(k )tm)(y*tlith unequal emfs of 2.00 V and 3.00 V, are connected as s t(j* t.g(mk)ffl)yeghown in (Fig. Below). If each internal resistance 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)



参考答案:     查看本题详细解析

标记此题
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? $C_{eq}$ =    $\mu F$

参考答案:     查看本题详细解析

标记此题
60#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You have three capacito:dbl6hl17+ym yc i2 8nmj/oy46lhu l grs, 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  

参考答案:     查看本题详细解析

标记此题
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? $C_{eq}$ =    $\mu F$


参考答案:     查看本题详细解析

标记此题
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. +lirfvevb.i , g3e8 v0Below), calculate the voltage acror+ ,gibe0lv8e . fv3viss each capacitor.
$V_{2.00}$ =    V
$V_{3.00}$ =    V
$V_{4.00}$ =    V



参考答案:     查看本题详细解析

标记此题
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 froq0lay vazws): k,nq*; m 4800 pF to 2900 pF. :qw z skva, q;)nal*y0
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?  

参考答案:     查看本题详细解析

标记此题
64#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric circuit was accidentally const*vc* tsm0a i:pructed 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  

参考答案:     查看本题详细解析

标记此题
65#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Determine the equivalent capacitance of the circuit shown i3hnu9iow bkdfwqk/ja(m )5vpn1717k n (Fig. Below).
参考答案:    

标记此题
66#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In (Fig. Below), if s0 a rca,rus(m/+q r-j$C_1=C_2=2C_3=22.6\mu F$, 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$



参考答案:     查看本题详细解析

标记此题
67#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In (Fig. Below), suppose a(cz3. plr rr j x/ef6u6b.:fi$C_1=C_2=2C_3=16.0\mu F$, 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


参考答案:     查看本题详细解析

标记此题
68#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In (Fig. Below), let 5edxc3r:r qp1$V\,=\,78V$ and $C_1=C_2=2C_3=7.2\mu F$. How much energy is stored in the capacitor network?    $ \times10^{-2 }\;J$


参考答案:     查看本题详细解析

标记此题
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$

参考答案:     查看本题详细解析

标记此题
70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Three conducting plates, each of area A, are connected as shown in (Fubp9 uh*32h2pca r,ldz 1(kusig. Below).9z lp1bsh2u up(k2, uar*3c dh
(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.
参考答案:    

标记此题
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 battet0xddz2wn ua *,xvq2 wye/v2 0ry. It is desired to store three times as dy00t xwqewx/2 ad2vu2,* nzv 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

参考答案:     查看本题详细解析

标记此题
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 capacitance, anfdl+m4 y0kd o2d as a series combination they are connected to a battery with an emf of 25.0 V. Imkl4y2 o+d0fdf the 185-pF capacitor stores 125 pC of charge on its plates, what is the unknown capacitance?    pF

参考答案:     查看本题详细解析

标记此题
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). Theb93ep2 x: mc r0c6rlog leads are said to be capacitively coupled. A time constant of grl 9mox30:c ecrpb62 3.0 s 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$


参考答案:     查看本题详细解析

标记此题
74#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. Below a (same as x;j 0d)jo hway*xt(*wwrf8 ) *f 3qvxeajxp66Fig. 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

参考答案:     查看本题详细解析

标记此题
75#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The RC circuit of Fig. Bef yx3s.6u3 cyl -s9axvlow a (same as Fig. Below 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

参考答案:     查看本题详细解析

标记此题
76#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two resistors and two uncharged capacitors are arranged as shown in (Fig.5,x(d l1 bkj: *yte6 d*n zdayfigp(am0+gp /a Below). Then a potential d* dzg05ipd *afy(:bxpldan,( je6k +tgm1/ ayifference 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?    $\mu F$


参考答案:     查看本题详细解析

标记此题
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 iv4qnxe;pdn3*m0 7om tfah q5 *f the meter sensitivitt mnp vx 7nao4fe0dhq*;5 *3qmy is $30,000\,\Omega/V$?    $ \times10^{6 }\;\Omega$

参考答案:     查看本题详细解析

标记此题
78#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ammeter has a sensitivityj h9ca;aaf8;y2q p4sx of $20,000\,\Omega/V$? What current in the galvanometer produces full-scale deflection?    $\mu A$

参考答案:     查看本题详细解析

标记此题
79#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A galvanometer has an internal4aup)dyjzd/0 j39x2 vs vio0g 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$

参考答案:     查看本题详细解析

标记此题
80#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A galvanometer has a sensitivity of zg;3f ch89m av$35k\Omega/V$ 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$\Omega$
 

参考答案:     查看本题详细解析

标记此题
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 consists of a dw+om9i tylnzp5zr+ -70qaux 2:9ptp $0.20-\Omega$ 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    $\Omega/V$

参考答案:     查看本题详细解析

标记此题
82#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 45-V battery of negligir0 2 ;gxvc qk 6/pru9c+mgd*lvble 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  

参考答案:     查看本题详细解析

标记此题
83#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ammeter whose intxspm1nasb7x(b:0v tbm3d .*o ernal resistance 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$

参考答案:     查看本题详细解析

标记此题
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

参考答案:     查看本题详细解析

标记此题
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)

参考答案:     查看本题详细解析

标记此题
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 in9jr za-mx0za6 error by lezja-69 rm0zx ass than 3%? $\approx$    k$\Omega$

参考答案:     查看本题详细解析

标记此题
87#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When the resistor R in (Fig. Below) is ayu*d07tpi- se zjgd1;v7r8o $35\Omega$, 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)



参考答案:     查看本题详细解析

标记此题
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 betweencx8h d i1q(cxgr;q:tz z 36a-o two points on the human body. The resist;6x z8:odi3acz rq h1c (tq-xgance 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$\Omega$

参考答案:     查看本题详细解析

标记此题
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,;q mkf gbpj8-* at 120 V. Such a bulb contains two filaments that can gpq*j8k -;mbfbe 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?
$R_{50W}$    $\Omega$
$R_{100W}$    $\Omega$

参考答案:     查看本题详细解析

标记此题
90#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose you want to run some apparatus that is 95 m from an electri(za4jwrs.8t c c outlet. Each of the wi 8t(zjcr.sa4 wres 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)

参考答案:     查看本题详细解析

标记此题
91#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Electricity can be a hazard in hospitals, particularly to patientsxcj(xsuq5ep7 6c5-i d 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 ground ha5isjp-d6(ec5uxq xc 7s 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)


参考答案:     查看本题详细解析

标记此题
92#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy must a 45-V battery e;vgg10hfm: loa 8*rwjrr);0m apj4 bt xpend 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)

参考答案:     查看本题详细解析

标记此题
93#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A heart pacemaker is d3dsf;aw7bf o6esigned to operate at 72 beats/min 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$

参考答案:     查看本题详细解析

标记此题
94#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a person’s body re5zt6kd ygo27i ,y0yyqwn5 l, lsistance 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)

参考答案:     查看本题详细解析

标记此题
95#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A Wheatstone bridge is a type-b/rgaxu9 ,cq7vp6ie of “bridge circuit” used to make measurements of resistance. The unknown resistance tce 67gv-uri,qx 9/ap bo 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?    $\Omega$



参考答案:     查看本题详细解析

标记此题
96#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An unknown length of platinum wizd1f m4 ;:2wi ph0elcpic 65pire 0.920 mm in diameter is placed as the unknown resistancpifp12p z;de i:cml5h0i4 6 wce in 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


参考答案:     查看本题详细解析

标记此题
97#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
What are the values of effective captxe5;. ein. slacitance which can be obtained by connecting four identical capacitorsl;e5sni..x t e, each having a capacitance C?
参考答案:    

标记此题
98#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The variable capacitance of an o zm4 l pzwl5cp.b8f+wpc00d f4;2t .fcr b)xtlld radio tuner consists of four plates connected together placed alternately between four otherw45 fllttlw2c;c8 rzpf4).+f c bpd.mpbx0z0 plates, also connected together (Fig. Below). Each plate 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



参考答案:     查看本题详细解析

标记此题
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 drawnkigt(xrz8es3u pvt- 6ced .03 from it and 47.3 V when 2.20 A is drawn. What are the emf and int (txd80er. piz3evts3c k-ug6 ernal resistance of the battery?
r =    $\Omega$
$\varepsilon$ =    V

参考答案:     查看本题详细解析

标记此题
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  

参考答案:     查看本题详细解析

标记此题
101#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through the pqw3lodx )8z e,2fz6j $4.0-k\Omega$ 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



参考答案:     查看本题详细解析

标记此题
102#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
An air-filled parallel-plate capacitor has capacitanc*3 tk1kp7h ep ezh3:lke $C_0$. 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.]
参考答案:    

标记此题
103#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For the circuit shown in(Fig. Below),cdlm.r;-gv h1n 5pc -o 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



参考答案:     查看本题详细解析

标记此题
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 +e.- 9pgbhkjhat 0.80 V when exposed to fulk +bhj9-gehp.l sunlight. A solar 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。

参考答案:     查看本题详细解析

标记此题
105#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power supply has a fixed outt my(x3-jv ,by koo3)iput voltage 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)



参考答案:     查看本题详细解析

标记此题
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 neon-filled tube as in (Fig. B. qhw6af1pzk9il5v7;r :f 8onwi1 d lze2b0qk elow b). This neon lamp has a thrizv;2rh 1 5ko eqq19w6w.0bzalf7k:i dl nfp8eshold 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

参考答案:     查看本题详细解析

标记此题
107#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through t82 (i2g2tniwl( zc d,uidz.i ghe $20-\Omega$ 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.    $\Omega$


参考答案:     查看本题详细解析

标记此题
108#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the circuit shown in (Fig. Belu ms/itf+fnoitb.an k6/j0xs) 45 s.u ow), the $33-\Omega$ resistor dissipates 0.50 W. What is the battery voltage? $\approx$    V(retain one decimal places)


参考答案:     查看本题详细解析

标记此题
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 circuiw 4pih6f 7el6q38je eft shown 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



参考答案:     查看本题详细解析

标记此题
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 (F. 9m8.vlci/ snezcmwe+t yy6.ig. Below a) to measure a resistw m.ze c..ceyn/9 ms 8i+tlv6yance R. If V is the voltmeter reading, and I is the ammeter reading, the value 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 $R_\mathrm{A}\quad\mathrm{if}\quad R\approx V/I\quad\mathrm{if}\quad
R_\mathrm{A}\ll R.$

参考答案:    

标记此题
111#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flash lightbulb rated at 2.5 W and 3.0 V is operated by a 9.0-V battbdw1x qf7: 7 13w;yvqf *ndjuprdi g6;ery. To light the bulb at its rated voltage and power, a resistor R is connected in 1q;w*r7xfvd; 1ddfubg3 :6p7 w nyjiq series as shown in (Fig. Below). What value should the resistor have?    $\Omega$


参考答案:     查看本题详细解析

  • :
  • 总分:111分 及格:66.6分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题,此次习题练习共有 111 道题
    本系统支持习题练习,作业与考试三大模式,作业考试自动评分,成绩排序一键导出,可设定动态变量同一试卷千人千题
    如果您对本系统感兴趣,想加入我们或者想进行任何形式的合作,请加微信 skysky1258

    浏览记录|手机版首页|使用帮助|题库网 (https://tiku.one)

    GMT+8, 2025-7-23 13:31 , Processed in 0.504692 second(s), 243 queries , Redis On.