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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 ccvuhz5 ak*vz82s 2b( nleqv-)hemical energy into electrical energy is cal2 28-nhzvv (vb)ul5cq *sak zeled 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 thrqral avu0dv 55x8jz19 ough a wire's full cross section at any point per unit of time is referred to axauj58 vq9l10avzr 5ds

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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 +k(tawb0lyy l+ez3(-c,izlq4s1z k m v ps3b/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 thmcy pz))jog4k,psh 3+ e 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 daz6sc2 ph)aa .: o5vk2ro7zttheir

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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 cmp zn fmnblw++ b)99*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 i+h -86-+yht9l tyhup /fteynns

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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 h:rv3 elkz2.z depends 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 lowest resistivity i2al41il5dmje 7p jx1h-z vn/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 t)-n()aej+isy rma :kfy;t7sk he other. How do the resistivities of these two wires com: ja)tyym ; 7eknf(-)kai+srspare?

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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 ,5k0k 7mlu mdwlength of the other. How do the resistances ofu0 7mkwkd,lm5 these two 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. One hass8;(4xg ejgvm twice the cross-sectional area of the other. How do the 4 g8(m;vxgej sresistances of these two 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 wiresls 90*54rq.xq ju+psm,mx0o r9vu b rs. One has twice the length and twice the cross-sectional area of the other. How do th9+sl 4 u xbu0 qjrvmrs*.s,5prq09xmoe 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 iu3k4d gfsa(;:8 bk,kutevb +vs doubled. By what factor does the resist; u:f (3svekv akud 8tbb,kg+4ance 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 dtwypku8w12 i jc9c1j )oes a 1.0 cm diameter rod have compared to a 2.0 cm diameter rw)1uw 1yi tp2k9jj8c cod of the same 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 cok4qgx+o1xbj +mmon 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 gmck ) olg2r 2a/l,0j po-ezn5of 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 equivalent ton02t 7jay u(tgme :3fo?

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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 eq5 jtimaxw ;cdf6fcj0 s7*:v9 puivalent 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 circuitmcfdl o;;qn;vin+.lhf2.wq g4b*d5/bv( mwz is doubled, the power dissipated bdvn5lqgmb.4v*h.i w;+ /d 2;fo mqc;(nf z wlby that 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, the power.hfw6n.1 /:ebjq ek ke dissipated by that circuit willqkjwb6eeekf:h/.n 1 .

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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 dr9g*bqr (f gc;v 2mmt)s/os: doubled, the power b )mg:f/qo(c ;t*vgm srr2d9 sdissipated 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 oto hpzk;f )u;1f constant resistance is doubled, the power dissipated by that circuit tu)f;o1p khz; 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 reduced by 5.0%. By woj)xy ss - qpn*b,:y vg*w1 s0-pl)gcdhat percentage is the p-yl ) *gx1vnps)w:qop *-0bscdgs,yjower 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 sinusoidal with respect to 27- w0ot* l r5bido jki/7x;k1u:v:hjpa gobu 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 wireswhje68k43-)a h g im76lkrdw2j)sf y d each carrying a current of 3.0 A. One wire has twice the diameter of the other. T-k2)y6sdae8 ) 34hjh f7mk ljidrwwg 6he ratio of the drift velocity in the smaller diameter wire to that in the larger 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 becomesb,0x; spau2l b7gib. w essentially zero at very low temperatures are referred to; w7.la b,sibp2 xgbu0 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 0.67 C of chae81,bg gm0crr rge 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 electroplat ixwhs,rmaw 1))gf53z ing apparatus in 2.0 min. What is the average ai)gxrzm53wh w f1, s)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 a point in 10 s for the current to bjib6vxb6:ph + vg*la. e 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 flowing if.hc(mz vy5w rfu 51b+d $4.0 \times 10^{16} \; electrons$ 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 drawsc1 jq;cr/vk2b z o*3yz 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have passed thc23jrb/ yk*z; q1vocz rough 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 deposit 40 mg of silver on bc3dj:0td/h e284yf rmh bz6 ia 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 yi30b fz4j/ d28tehr h :bcm6dweight 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 require8 ggs;,u dko,j qfp,1kd to cause 4.00 A to flow through a resistance of 330 W? 1gsg,q ;kkofj8ud, p,

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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 resis7 5au2 4e*k,dboay./u zqohc,k 1gabztor 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 cur.mpmpxy wz/cc+,n y , ah:t6v1rent 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 at 110 V draws 1.40 A of current. What is its res .rg cgm:;ipe0istance.cgg i :0mr;ep?

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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. Ho 9x.z,7w6xx,zf4phcppie .lpw many electrons flow through tzpiz7 4x.xxl cwh, p,.f6pp9ehe 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 res7aox.g/; l6ru tkmp7ristivity of copper iso; .mar tru/xk67lp g7 $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 e i5t-2y flw1u1.0 cm in diameter and 45 m long, if the resistiviie-uf 521lyw tty 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 copperg/my biwom,+-+b l6 ah wire (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 (res n5 (zu gg+mf6n,tdpu-g mia/v8bb9 6jistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 ohmsnm0i)g9ljk 1p. 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 0.321 mm) nibpjf-zcrhw- 2al2xb 6 *,z.wichrome wire if it is connected to a 12.0-V bal,px--j. a2fziw 62*cb h zrwbttery. (The resistivity 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 cm long and of rectangular cross-section, 1.0 c(59c )pbbk:ybm,b .eykmi : 1 izm8rycm x 2.0 cm. What is the voltage drop along ibb9pc m y .)yeim(5 iy :kb8:cmk1b,zrts 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 wirr*vo :2 daujk5e has a radius of 0.50 mm and a 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 wire (resistivi v4vge kv ;:r:y8/i uw1spg;bkty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resi,yd68ahy; m sumqmd+9stance 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 ngum / tpo 6p7d4bk(p //8bf(nylob4ovp8a9y 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 po 7et*c g3*k7xokzu;km int of indium. The resistance of the platinum wire k ;*37ez muog*7ktkcxis $2.000 \; \Omega$ 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 througc 45lm v2g(z d)vidp(:gwhig0 mz w/g3h 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 itz8 cbswjr**w- 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 mucwd q.17k l iak;84typoh 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 resistanpc(9c0)fj;clag a 6p oce of a 100-W light bulb designed to be used in a 120cg(apcoljf;6)9c0 ap-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 r.2ov *vx+ct. hmm)kzhudt xi 6:q8c.resistance of its heating elemendmx r.)h co i.2m+ *xhtkvc:utvz6.q8t?

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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(ldi07nf- t b-lghos4 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 rbuf0f 6x3c)xw* t 1sbp3acozyz w6i4 .ated 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 8mzzb )o4qdm:djxm( 2used 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 120 V, what is kz /ogegi(y;8 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 is itsj0ofav3m*q xdm p/1)t 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 operat*fo:hp2iiz8- xuwrs( 6ox2 tf e a 25-W soldering iron for 8.0 hours, if energy costs8 f(:zirphixo2-2t uwof *6sx $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 light bulb use in 8.0 ;h .:kvsrbu. whours?

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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 eni zdzhljhx0ib1p30*/la 2 b)fergy is proddi )ha/*lx01lz3b hizjfp0b 2uced?

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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 and 160 A-h. How much energy does the ba ttl2:/+kyx+ 42shn t;vi avemttery store?; k/t2x+as2h mt:evlt+ yni 4v

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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 +*zwgund p ,f825-W soldering iron 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 o;fmvc1jop j:dn ;/z4day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estipvo:j fmd14;c/jnz ;omate 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) is turned on 8.0 houv um a2zv wn;4 m;/ x/)adfs6ts3nstp3rs per day. If electricity costs 10 cents per kW td vnx4/;;n6 a)3smsa3 fsptuv2 /mwzh, 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 x o//ai(v)lbh the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a a(bh l)ovx/ i/series connection 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 electr60pw- iakq:wg ic drier 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 temp gapqwk-i6 0w:erature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) 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 thnkd.su n )r3s0ki1lbx(v3ag9rough $8.0 \; \Omega$ 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 costs .j 6hm qnlbl.hya9hygts8x+ a3xylz4m:.0m6$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 2.0 hp hasfp (7dx:ulimj3z- d,b 60% efficiency. How much current does it draw from zjpu(m x:i7ddlb,f- 3 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, nrtd7v- ,qsf o4m9ygnup5b( rms current flows throuy,s funmqo7 5n r-,4d(gbtpv9gh 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 power source. What peak current flowsllol;s 57/ 2 swec-pbz through this dcs7o2/b zwlsel-l p;5evice?

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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 x9*gl316yde lk;p)or dqcl;e is the peak voltage across thiql ly3r ;dlge)ckxoe91dp6; *s 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 shdlio))rl 7.4e5o uo+qg. aedafe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what i+.) i)ag5d74 luqoeeohl. dros the drift velocity of the electrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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