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习题练习：Physics Unit18: Electric Currents
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 作者: admin  发布日期: 2022-08-17 11:19    总分: 80分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月17日 11:19  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A device that produces electricity by cb ilg ,spdgtp ;t4 xj+5rp3qwz-:04i transforming chemical energy into electrica3wdx4si ipt4g+ p-:lzr ;0 qjg5tbcp,l energy is called a

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car battery

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total amount of charge that passes through a wire's full cross section7 obt vaqi9t-/g,x7 kh at any point per ux/ h,atko7gi qt9b 7-vnit of time is referred to as

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The direction of convention cgn1r+)j0vh (kkfusw) urrent is taken to be the direction that

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coulomb per second is rwa q/w54xinh (acs( +the same as

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car batteries are rated in "amp-hours." This is a measure of their v;b,.x; y+hdjggbab ,

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistance of a wire is 7sy bgfm,/d,j defined as

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is $1 \; \Omega$ equivalent to?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistance of a wire 2 7yr+5ucuytg is

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistivity of a wire depene+wicl:jq bkovs:-)v,vy3w aa:: 7uyds on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting material has the lowest3.u8inf dgij*i ouog0e16 /yy resistivity value?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. One has twice the length of the other. How do the 18dx7emh w)f 3 jkwcnpd xr4og;n ;)+-gu-s joresistivities of these jd 7rkx3 j s)8-+x;; w c f4u)m-n1ooegpdwnghtwo wires compare?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. One has twice the length of the og3dq4zw 3 3 )jl8 tk1q s(orvnpog30ton;0t yather. How do the resistances of these two wires compar3qv0ypl)n34(g z t10sdjo oqnk3;3 goa w tt8re?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. One has twice the crossrfg )h unj9)mv kzv.(y0(p)jc-sectional area of the other. How do the resistances of these two wires com( p.j)cjhvkm)zn ug y0f9rv()pare?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. fywwi sl+ .oc3fd+g/ - One has twice the length and twice the cross-sectional a i3l/+o-dg .w+sfyfcwrea of the other. How do the resistances of these two wires compare?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The length of a wire is doubled and the radius is doubled. By whahp1/o t a2k:qht factor does the resistanceha:2h t1kopq / change?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much more resistance does 4jln 1zy.qq/kde7 is 8a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the sad zqil/4n 8k1eqj sy.7me length and made of the same material?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistivity of most cov :z6pg7g+ prummon metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficients of resist qkn;:l ,-o99 :v j f(od9mgnblfdxa:sivity

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is 1 W equivaletmr706+gs)9sasj flbnt to?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A kilowatt-hour is equivalen,mtpb,zzsl j441kbci( kz. z9 t to

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the resistance in a constant voltage circuit is doubled, the poq1bf5k58+z .;oydik 4zl h wfjwer dissipated by thaf+5o4 ik.bdf;jy5h k 1z lwz8qt circuit will

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the voltage across a circuit of constant resistance is doubled, thel;6 e3j +gd yqbuy/8be power dissipa ;yee qd6/3yb gj8+lubted by that circuit will

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the resistance in a circuit with constant current flowing is double+xb wd 5 (fxxq-dahnd75m wl*,d, the power dissipated by that circuit wia-whxmd +d5blx7q ,(n 5*fwdx ll

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the current flowing through a circuit of constant resistan 1 2hj2ls4 x5rj5gw+cxtnc6tcce is doubled, the power cgsjjxc+ 6 2t5 5h4rwcxn2t l1dissipated by that circuit will

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  During a power demand, the voltage output is rhg88a1z.pzxu*b 8v)xrpx g+k educed by 5.0%. By what percentage is the power on a resistor affehgu k.* z8apz+x8)b8r v1xgpxcted?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A current that is sinusoidal with respect to time is referred to a8l-0 l;tzeu f5rtjc vq80 ud:cs

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires each carrying a current of 3.0 A. One wirf4eip3 9t*/kr7md2v -d( mllsep nr9f e has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in the lar -9fin4f/pt7 v3l rme(*rlesm 9dp2kdger diameter wire is

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Materials in which the resistivity becomes essentially zero at vek)guy djt pz::/54 qdtry low temperature)/ zkt q5:tdjdyu:g4ps are referred to as

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current is flowing if 0.,eu-l /e5.oc bn7k(2wwkdedi67 C of charge pass a point in 0.30 s?

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charge of 12 C passes through an eleyf, h7a y(gyyzygmo5siy 0fy5 *. v-u2ctroplating apparatus in 2.0 min. What is the average curmz07i,a5f*yy hy oyy su5( yvf2gg.y -rent?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much charge must pass by a point in 10 s for the current to be 09 hbpv62sr *tc.50 A?

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A total of $2.0 \times 10^{13} \; protons$ pass a given point in 15 s. What is the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current is flowij zvs,k;s1*ne2gg1(nn y4td ( hetp1lng if $4.0 \times 10^{16} \; electrons$ pass a point in 0.50 s?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If $3.0 \times 10^{15} \; electrons$ flow through a section of a wire of diameter 2.0 mm in 4.0 s, what is the current in the wire?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coffee maker, which draws 13.5 A of current, has been left on for 1*mw(pvgb09 ju 0 min. What is g*(p vmbj90uw the net number of electrons that have passed through the coffee maker?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In an electroplating process, it i;)y v-o)r:+fvag doras desired to deposit 40 mg of silver on a metal part by using a current of 2.0 A. How long must the current be allowed to run to deposit this much silver? (The silver ions are singly charged, and the atomic weight of silver is 10+og of;a)yrv a:-v )dr8.)

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What potential difference is requirj 6-pyt+lr(bqed to cause 4.00 A to flow through a resistance of qj b6t -(rly+p330 W?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the voltage across ta.; qzcq2h dml(o*(p e*x0 osh2rj7ra 5.0-W resistor if the current through it is 5.0 A?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4000-W resistor is connected across 220 V. What *3-1mn*fh0gjb zed i10hf mggcurrent will flow?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A light bulb operating.4 oyogp h t,figlm:k*yl1o11 at 110 V draws 1.40 A of current. What is its resistance?ol4. hf, l:migtyoygo1*11kp

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-V battery is connecte s7 e)+rflaq6ud to a 100-W resistor. How many electrons flow through )fa+e7l6ur sq the wire in
1.0 min?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resistance of 1.0 m copper wire of diameter 0.40 inch? (The r t64u.bmuo 9zsesistivity of copp uo6.sbt uz49mer is $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resistance of a circular rod 1.0 cm in diacg snw2weu)-4meter and 45 m long, if the 24-ncs wg wue)resistivity is $1.4 \times 10^{-8} \; \Omega \cdot m$?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What length of copper wireolh3u 2owospd 8p6 a,/ (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) of diameter 0.15 mm is needed for a total resistance of $15 \; \Omega$?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 120-m long copper wire (reml bq9136r mi-fzozq1sistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) has resistance $6.0 \; \Omega$. What is the diameter of the wire?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.5-cm square rod, 4.0 +e-pf7zf7nph pjgz/- m long, measures 0.040 ohms. What is its resistivity?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the current through a 10.0-m long 22 gauge (the radius is 0.3mgsl zh*,+amr 9lid 0s;4c z-p21 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity of nicsdam,l zrg+ i 0h4*zm; -p9lschrome is $100 \times 10^{-8} \; \Omega \cdot m$.)

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A heavy bus bar is 2esf,,6zm -nlml *;z6qkgf sc)0 cm long and of rectangular cross-section, 1.0 cm x 2.0 cm. What ,)*l,fn g6 zmk;fc l -qss6ezmis the voltage drop along its length when it carries 4000 A? (The resistivity of copper is $1.68 \times 10^{-8} \Omega \cdot m$)

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-m length of nichrome wire has a radius of 0.50 mm and zxgk8 pr te981a resistivity of $100 \times 10^{-8} \; \Omega \cdot m$. If the wire carries a current of 0.50 A, what is the voltage across the wire?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-mm diameter copper wir + wsw)e9iuj0ee (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) carries a current of 15 A. What is the potential difference between two points 100 m apart?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A carbon resistor has a resistaqzb 8.s o5vq)wnce of $18 \Omega$ at a temperature of $20 ^{\circ}C$. What is its resistance at a temperature of $120 ^{\circ}C$? (The temperature coefficient of resistivity for carbon is $-5.0 \times 10^{-4} /^{\circ}C$.)

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The temperature coefficient of resistivity of platinumue )b,l7z4 jjb is $3.9 \times 10^{-3} /^{\circ}C$. If a platinum wire has a resistance of R at room temperature ($23 ^{\circ}C$), to what temperature must it be heated in order to double its resistance to 2R?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A platinum wire is used to determine the melting point of indium. The res5q hh/,r+nn5s:kh ji shx/v 9tistance of 5/9xntv h:+/qrhh ns5 ,ikhjs the platinum wire is $2.000 \; \Omega$ at $20 ^{\circ}C$ and increases to $3.072 \; \Omega$ as indium starts to melt. What is the melting point of indium? (The temperature coefficient of resistivity for platinum is $3.9 \times 10^{-3} /^{\circ}C$.)

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.00 A is flowing through22s-pjv3 :u2csu3 mt-pkd mdw an $10.0 \; \Omega$ resistor. How much power is being dissipated?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 110-V hair dryer is rated j)rj62pbr( gs at 1200 W. What current will it draw?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W light bulb running +w mr7r;8)6puhozewtmgn t3e 6b*/ tnon 110 V draws how much current?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the nominal resistance of a 100-W light bulb designed hj1w :9yhju1ps /cuh3quci(8 )t2wtbgd /*evto be used in a 120 d3e j2 hv1iwj)/t/ hyghqs98(u pb:cutwuc*1-V circuit?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toaster is rated 800 W at 120 V. What is the resistance of its heatinwn (5lmgvwfs.10 vfxum: r/ u(g element5 wmg/fu.rnux0fv1(lm swv(: ?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 200-W resistor is ra-:c rj1-i/g 7lj2 .zlyn2:sbuijsy)6fp zs ubted at $1/4 \; \Omega$. What is the maximum current it can draw?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 200-W resistor is rated am29hvcpdrs;f7 :da t-t $1/4 \; \Omega$. What is the maximum voltage?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lamp uses a 150-W bulb. If it is used at 120 V, what curredkjg: o-b6 e0ent does it draw?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lamp uses a 150-W bulb. If it is used at 120 V, what is its resis 5-4htffemkn-uf;k.ia a 8)bztance?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 25-W soldering iron runs on 110 V. What iqm ;i q3jurvo:drib0*9 u3yq :s its resistance?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much does it cost to operate a 2kuk;3cf d9 mm//zd;m a qg39o vkwp.8c5-W soldering iron for 8.0 hours, if energy costs q d9kk/3p9k;/ zg voacmwmu cf m3;.d8$0.08/kWh?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy doeswuucdlul+. 3,se:gn j/m d6 t. a 100-W light bulb use in 8.0 hours?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-W heater is co (vi(ajie a4g0+j y;punnected to a 120-V line for 2.0 hours. How much heat energy is prode j( u;(ii04jvaypg+auced?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A battery is rated at 12 V prn-rvx 2zj: z+,e /yhand 160 A-h. How much energy does the battery store?hjn x:/+yr z2-pve,rz

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy does a 25-W soldering iron use in 8.0 hou i4dc9 (om6o 1+otqtxji9k s7frs?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-W driveway light bulb .t ie7f- yfns3z lgl:-is on 10 hours per day. Assuming the power company charges 10 cents fot 7gf.fs:3eynz-i -llr each kilowatt-hour of electricity used, estimate the annual cost to operate the bulb.

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-W computer (computer plusqqnt2m( ;xv:k monitor) is turned on 8.0 hours per day. If electricitmq:n;2 xqtvk(y costs 10 cents per kWh, how much does it cost to run the computer annually?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The monthly (30 days) electric bill included the cost of running a cenb.deb0p y)nl-f h54mz j4dep;bhew (4tral air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light bulbs for 5.dp hnmb-4j( dewe;e0) b4l4zf .5py hb0 hr/day. How much did these items contribute to the cost of the monthly electric bill if electricity costs 8.0 cents per kWh?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The heating element in an electric drier operates on 240 V and generates; (uw/d( pbtuwc. k)ud heat at the rate of 2.1 kW. The heating element shorts out and, in repairing it, the owner shortens the Nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its teu (uk t/dcb).wdwp ;u(mperature.) What effect will the repair have on the power dissipated in the heating element?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  14 A of current flows throughsl z5r 2 dfnhp18o6wjbuw,7*e $8.0 \; \Omega$ resistor for 24 hours. How much does this cost if energy costs $0.09/kWh?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 9.0-V battery costsnt jib6 hp7(a9sp1jl87 +kny a $1.49, and will run a portable CD player for 6.0 hours. Suppose the battery supplies a current of 25 mA to the player. What is the cost of energy in dollars per kWh?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motor that can do work at th ;5m*e-. iskycgn;bbge rate of 2.0 hp has 60% efficiency. How much current does it draw fbsen myik.c-g*b;5g;rom a 120-V line? ($1 \; hp = 746 \; W$)

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-W device is connected to a 120-V ac power source. What rms current flows 9f bjp-zuj63 uthrough jj9pfb6 zu- 3uthis device?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-W device is connected to a 120-V ac power source. What peak current flow /6yct ixswpz5pv0/p;s yv z0x/pts/p5 c6;wpi through this device?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-W device is connected to a 120-V ac power source. What is the33* *mglbm 0sx9wepf,riu r5e peak voltage acrose5m*0gl*pmb3xs9 eiruw f3r, s this device?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diameter of a copper wire is 0.081 inch. The maximum safe current siac,w w1f;-cit can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift velocity of the electrons? (Tcfiws w ;a-c1,he number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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