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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://5edu.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 76，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://5edu.win/test76.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 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 transforming chemical energy iqyoj y5h,w s7(1mh oa-nto electrical energy m,7 ysjah-5q1w (hoyois called a

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 patzzcqb/ b-.k./j 1 ktusses through a wire's full cross section at any point per u1 t ./jz./bcktbqukz- nit 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 current is taken to be the direction tha1jaj xvwvacf y2m88 *.t

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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 the1pucuv12g*ho+j.hon jp i 3i. 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 raof2 osl/9 hy.bted in "amp-hours." This is a measure of their

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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 defined x..o+z c9lrjzp7b 4efas

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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 wibx4flj88 lygk 5y3ywd7 fk7b, re 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 d8m qw:41:nqf y*j jnkuepends 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 low/ 3*a2 :xsmf4 -+hztaimwerxiest 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 tledb6) a+z8(iwfp4c xhe length of the other. How do the resistivildziw )4x8+b6f c(eapties of these two 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 other. How do the5v( 6bdxeg+uo resistances of these t vobd g5x6ue+(wo wires compare?

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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. kb r+z7/e385f* btof+myww axOne has twice the cross-sectional area of the other. How do the resistances of these two wbyrwek* f8f +x5az+7/m3to b wires compare?

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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. One has twice th av q i0ae,i9y7zy5o;pdev8)ne length and twice the cross-sectional area of the other. How do the resistances of these two wirpo 09z)eiiv, 8 navy7 qda5y;ees 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 what falhthvtgi4p ( r5a2ks k.+7j:vctor does the resistance change?7 atr ljh42vvit.p5+( gh k:ks

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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 a 1.0 cm diame+ 2 f*t btsgf,j1dszuqeo )1)kter rod have compared to a 2.0 cm diameter rod of the same length and made of the same matedf o ksgs)q*j ub2z1+ft) 1et,rial?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistivity of mow q,(rq6gg1t mst common 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 )c cgq+e 4f3(iupie ;opk 7r1cof resistivity

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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 equivalet35e7 ywg3vfp1f wl7gnt 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 equivalent)dj fy0m9jnd* 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 dounfnlszj- /-6 zuf+t/vbled, the power dissipated by that circuit wjf+su-/n f /nlz 6vz-till

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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 cir.dorkp(fi 7-uta fx((- vj yh3cuit of constant resistance is doubled, the power dissipated.ufyk(a3j d-tf or-(ip7(x hv 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 constabr :. uh wir45irmcy6g8 fa)/j u2ng*gnt current flowing is doubled, the power disig.h:ny 4iu5r68gjrw/ 2r *u m )fbcagsipated by that circuit will

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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 consta7,m9qj3 bm qihnt resistance is doubled, the po,3 mmhbqq9j i7wer dissipated by that circuit will

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 red ;vzj-br 9tu3ruced by 5.0%. By what percentage is the power r 9tu r3bvz;j-on a resistor affected?

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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 sinusl rxjd5 :+o+quoidal with respect to time is referred to as

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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. O d/)*.pii+s f*dczpy g2bu fz:ne wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in the larger di*+ffbd * )c/sy2zui:i. zdpgpameter wire is

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 lv/+o3(fjeix/ eii -cs1ztq5 resistivity becomes essentially zero at very low temperatures are referred to c-/x1fs5tz ieoq/(e +vjil3ias

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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 *h+bu 22cyogp0.67 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 electroplating apparatus in 2.0 min. b,7 s13faxgjc 7o- k;n er)kqqWhat is the ave)qs1b 3cx;7n j,f-a okq rgk7erage current?

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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 adu r8*eck:zcq3 ,)lykd-x/ x w point in 10 s for the current to be 0.50 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 flowinmp ;uuph120 seg 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 10 mi+gflo(: m*tnmw r6:s xn. What is (rm6:wf gts: *loxmn+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 is desired to d*nuokqr,*en. gq9h s 5eposit 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 ionserqn u59sh.*q,*n ogk are singly charged, and the atomic weight of silver is 108.)

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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 requux*np i7q 7:btired to cause 4.00 A to flow through a resistanceqn:it p*7u7xb of 330 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 a 5.0-W resistor if3 ia ov ksm2,(a30qfwp 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 current willuhek6 8 o ivw8+1gvqfee()/gy 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 at 13-ee(ur k n9v tws)mp310 V draws 1.40 A of current. What is its resistance e9uksn) (p-r3 wm3tve?

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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 connected to a 100-W resistor. How many electrons flow thrd + u ,/7bmaql0fht-*kt 1wyrcought 1k-ubw/ a h7,fdy mcrt*0ql+ 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 uw+r r02 u5st 7fgvmh 4 ek:x3.8dqw(bixisi4 diameter 0.40 inch? (The resistivity of copper r: m23wfiuebhdiqgtx8 +rwksv7 u.s (5i4 40xis $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 diameter and 45 m lon4xx wnns;(sl+gw 9j0 zg, if the resiw;njg(xsxn+ zs0 9 4wlstivity 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 wire (resistivitf3 d7 g7vxzciq4 )e:bvy $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivity g , .gj6ksm0 yn9 io-mwuk:n9r$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 m long, measures 0.040 ohms. What is its resistivi hor,d6a,f 73y9jglpkrx, n.lty?

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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 1h * dx 1bq0lh0x58ftrm0.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivlhdt50xb 1 0rmq8 hfx*ity of nichrome 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 20 cydy bu;ut h/4x)gpq,s82pc- om long and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the volta-g4uyxht/ o dq,ppy 2cs8)b;uge 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 a resistivity o uiud/ 7 ot;s(f(sx+ya y5he)tf $100 \times 10^{-8} \; \Omega \cdot m$. 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 wire jv r)0ej1rbp v;79 0 vtrwixj7(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 resistance ocg,jj,k9+z lhrta. 3x f $18 \Omega$ 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 resislm3ebh ;vll1mo7)e u m, r2t7itivity of platinum 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 z s0/+e.grhxfzvxwb (bt4:7 g of indium. The resistance t0b( z+:gx /szvbf4x.r e7hgwof 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 through i 65i-;xee,y(y9krutnc:d9vnp k f ,p 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 at 1200 W. What current will ity rybip+eh h5v) .e.4j 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 on 110 V draws how mup agszc o, n82c71to+ach 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 bulbg *x*,r kr)b uzomo;2.vws fc6 designed to be used in a 120-V cigrsz. o;c )mbkr6*, * wvofu2xrcuit?

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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 resistxey .an:( pd;aance of its heating element (;nyeda :xpa.?

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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 rated a xgs:b4 th zp4pgr*9jx9*vks8t $1/4 \; \Omega$. 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 .,o u2jtgab d k8od0l+at $1/4 \; \Omega$. 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 vuu+*(g +mil i*jas.m at 120 V, what current 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 12g 5j1jjfax 0jql.k)* z0 V, what is its resistance?

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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 3c7 pvuojroy2/e7k8a is 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 costy *f/wcsl hsi,iv+/89wrp3ix to operate a 25-W soldering iron for 8.0 hours, if energy costsivwy,w9sfs r/*pxcil /3 h+i8 $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 does a 100-W 72*lx/ o5zz jowtn6mxlight 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 connected to a 120-V line for 2.0 hours. How much heat ea8 us6 0eg3fwot.7cg nnergy is 6.c7eas3 nf0g8t wugo produced?

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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 cxm0+w;*e6pgf oz h.l V and 160 A-h. How much energy does the battery store? +wgleph0oc.zm6 ;fx *

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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 ala)chd -z6+g use in 8.0 hours?

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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 is on 10 hours per day. Assuming the power coj4v- dz (sh7r k9anmu4- 9knemmpany charges 10-mduenkz 9(kh7j r44 sm9van- cents for 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 plus monitor) iswl;gfuft:9398 k xu dw turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost toxdfwt 398g :;lk u9wuf 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 central aitk-vgnai urp :1 ( fekp4esmukg112-(r-conditioning unit for 2.0 hr/day at 5000 W, and a series co1u ns-p 4tek2gk-(pfe: k 1rivg(ua1m nnection of ten 60 W light bulbs for 5.0 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 driero 6n1hv 1ly:j(b/ ehhjsw+pa0 operates on 240 V and generates 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 temperature.) Whv1h+p(l: bs06hnw eja 1oh jy/at 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 p -e;e --run -6kkfc1 uoahxt6a s,2etw(x t)tthrough $8.0 \; \Omega$ 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 costw g b;ewt7c1:ms $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 the rate of 2.0jj/ v.r0v 7+*i;pjv:c kaihzd hp has 60% efficiency. How much current does it draw from a 120rpavz;:dij +7vj/ v.i0 *hkcj -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 15w/f sstfg2*f7x6 vfj20-V ac power source. What rms current flows thg76f/s v *52fsjxftwfrough this 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 po88ktp4lg d(k/pqhi st2x0 /a qwer source. What peak current flows through thisqhlktg st/p/i4 kq8d20 xa8p( 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-z,c+u2s kd*39.orc ktr +aor cV ac power source. What is the peak voltage across this devicrk tk*2r+ocoras., c d+u z39ce?

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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 inchb ah+,(jy ul:y. The maximum safe current it 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?jahy+ : ly(u,b (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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