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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 eaf:y8n:k guy qu( vv.p:r9v8ynergy into electrical energy 8 ::q9yry8v.v :n kf upu(yagvis 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 char 7dkhd7u2za(lge that passes through a wire's full cross section at any point per unit of time is 7a lkzd 27(udhreferred 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 trg+5plrm;i: a l ytp0(hat

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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 the same a o 0czibf*r*t6moso9pt , :w/bs

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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 i, rxw5ymo8o9; a(6ri e.dtmds s 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 wire5+txr8/layb( vob)v y is 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 i0-nkc4z1yonfq7 w12v fvk5y 0 8npr uss

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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 depends oirxqanlvv843 2) ih4/,r g jobn

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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 regn81 3zk,qsci )i45wzyqzg *u sistivity 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 otp.k c7 s8v nbrwa17lb,f0si t*her. How do the resistivities of these7btn 0lsa* r pw,s8c1ib 7fk.v 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 twi t3x699abpyle cso(;gce the length of the other. How do the resistances of these two wires c6;3pctglba9 9 xy( soeompare?

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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 croz7uze8 ; h4*hzkl)wmqss-sectional area of the other. How ezw8m lh4 u*)hkz7; qzdo the resistances 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 wires. One has twice the len xlgmp8q.-;uqwj* *zq, (6ofuime-jtgth and twice the cross-sectional area of the other. How do the resistance(6fz imqqe*l*puwj8 q-j ,o.m ugt;x-s 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 what factor doesi zc7y9n2nv;xl 5. dgf th.ix 29gf;lzn5yd7ncv e resistance 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 a 1.0 cm diameter rod have compared to a 2.j;bax4 ql:c3 h)e+ tgt0 cm diameter rod of the samceh:);x t tq+bg34lja e 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 common 4tk+g(tvk2u5(2;l qs bjw q hdmetals

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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 recqvh0ib 0hj o:1nf 6t5rr(0a hsistivity

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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 to?f .rhu :ptzfmv,ef6-;gqn1 m+

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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 tod1z7 z5 mltaj3

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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 constantybg wbh( kq5 mrny.;t6 ds0:r5 voltage circuit is doubled, the power dissipated by that c; .rkns0dtw(5y:yrqb5 6h mgb ircuit 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 f9f :aeuw26pa56z/ i0o kr cgdis doubled, the power dissipated by that co/fpe656afu k02g9rcdi:z wa ircuit 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 kgj) 1tw) 2:pkidf/pscurrent flowing is doubled, the power dissipated by that circui:tw2gdkj fpk1 i/ ))pst 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 constant resistance is doubled, thvcz*kn (*3rio e pi*okr (zv *3ncower dissipated 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 ougn9j3k a; suhnhxcn9b;zx) 61 w 24,tdyme o(ftput is reduced by 5.0%. By what percentage is the power(uwk;o 29jbmh3) c;xg 1adfn4 ntz eny9x,s6h 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 time is referred ttsjj 5l( e-bf8o 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. One wire hayi.;is-lth f)4cm;sepf/ s ,;pop3urh d k*:qs twice the 4f3u;t)lfqp,s; ;e ioc-d/ py.ksr* sm hp:ihdiameter of the other. The 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 becomes essentially t:;eqx7kf)ftncz. 3 qpqae/0 zero at very low temperatures x c0qe.ta 7z k:/ftq;n 3p)qfeare 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 0.67 C of chawhq* any0*e-g 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 passesaa11/w.y y)nco2 nycq through an electroplating apparatus in 2.0 min. What is the average currec1y / y12c yqaan)own.nt?

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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 l xbcq/dvd7 +gb0:r1 rfor 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 flow wp;+tzplfakoej95-h4i t*k) ing 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,e tt1dnvi 88q7 has been left on for 10 min. What is the net number of electrons that have passed 8t tn81viqed7through 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 onm3)n t e5yt(2ibv4mtd9rc9i hl* ;kbq a metal part by using a current of 2.0 A. How long must the current be allb9rt 4)2mqc* t t i3endvi(lk5 h9mby;owed to run to deposit this much silver? (The silver ions 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 required to cause 4.00 A to flow through a yp+zu : 1w0esyresistance ofz:+ep 0uwys y1 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 if the current thro ++ bcwkjxwm/-c;u rb; :a+xmuugh 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. What2rc wppbo8 x/d2h 8l,g current 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. W dgcw;czn l/okg6n3.*hat is its resistance3nc lwko d/g6ngz ;*.c?

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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 m-ksa.9 l dfex)any electrons flow through the wire)fxe - a.sk9dl 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 c80*ypuyfry 2+mv) k uvopper wire of diameter 0.40 inch? (The resistivity of copper is *2y0+ k)vmy8r uvpfuy$1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 jbwdi *-ra k6u ;o4.xgcircular rod 1.0 cm in diameter and 45 m long, if the r wugor.k-i bd64xa;j *esistivity 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 (resistivi;a. .vp2sr8 pq5 g:y7mnowpzcty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (rbm aruf 9xs76g.lrf63 esistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, mea46m (rhfid)*kxmuw jmlp*6k5x3 4c aysures 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 gc4( (jvr kyho;auge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The 4k(vhyj ; cro(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 cjos f):v;q 6ih-/xxmjm long and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The rmjoq6;hfv /x:i)s j- xesistivity 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 of 9ojtc4rq: i/9tr ieq*$100 \times 10^{-8} \; \Omega \cdot m$. 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 wiqvve4j94aqo yrtf l ,( 9sn-qyg1+pv5 re (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 resista9dz- o vg6yns4h5;prbxx.k 2 lnce 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 resistivztncmopms* k3wtdq4 2bcy030bs) f /4ity 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 of ind7wmbler q49a ,,dwp c1;gxaz .ium. The resistance of p dr laeb,1 w,aqx7g9 .c;z4mwthe 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 throughuo;3+eo (qxppd5su l: 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 curre)h2ebke;1 bex;g kt 4rnt 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 on 110 V draws how muc)2k(;oih wbooi2ba z zm-6kf.h 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 102 np5u6lnkq k 3f1sgs:0-W light bulb designed to be used in a 120-V ci u15n2gslfnq6pk:s3 krcuit?

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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. 4 s/ 88(s/(eiqxx+rqfwaj rioWhat is the resistance of its heating elemen irsqqo(4/ (rai s/x+8ewfx8j t?

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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 rbff.,t an0p7tg a-h p3ated 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 ratshi m*2 asq*f2ed 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 * s979g+8yjuis tc0y jfo*pzibulb. If it is used 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 bj(cyoaq 31m 0culb. If it is used at 120 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 ish u l)as*h8 14gs5,oktbo qh:h 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 cost564 lbkfsq hu- to operate a 25-W soldering iron for 8.0 hours, if energy ck46hf5suqlb - osts $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 uw:lug+3m7 og+wrl. hise 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 conn d6 j6o+nu-ya1wchth. sr+:qbected to a 120-V line for 2.0 hours. How much heat energy i6 .ntjo-cr +b:16d ushya+wq hs 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 V and 16sc4. ;g9 vdzeh0 A-h. How much energy does the battery store?cs.d4vghz;9 e

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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 inrpn 2os2q p04(n nxog2 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 ncjti59ssnfm;q(256ucx5eb . Assuming the power company charges 10 cents for each kilowatt-hour of x f(ce96b2smc;uniq5 55sjt n 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) is turnl2iwghd kvv. 3:ev5)-yloyzp c4p 8m*ed on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the computeril 8-wd:hv p yyv2e.43v g*)mlkc5poz 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 f1yi b+a15lxgh o 3vw(included the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a 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 elo3hg l15y+avb i(w1x fectric 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 inrqbe pt,1z;3u an electric drier operates on 240 V and generates heat at the rate of 2.1 kW. The heating element r;e3 1ztbqup, 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.) 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 ni/tu/ 44qxkx4rht4m0i tt8 lthrough $8.0 \; \Omega$ 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 0efe3q3 4qyfv$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 has 6zc4sh-bslia 6k1*c z:fv p.; w0% efficiency. How much current dlah41; fz :ipvc.ks* -zwbsc6oes it draw from 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 tod i9i 8dxcjw-qtwi 5 r*3i:dbv83 sr*e a 120-V ac power source. What rms current flows through th b 5v* i:i 3rcw disx8d9q8e-3*wdjirtis 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. Whaji1n szh57 )7wl4xi2;vm5zhm1 vmve kt peak current flows through thi5h )2znv4j mlv;v m1z7 571kiimswex hs 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 conn1iz7 cqpy g7,sected to a 120-V ac power source. What is the peak voltage across this sy, 1q7cpi7 gzdevice?

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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 it yc1sab fm1k96 can carry (in order to prevent fire danger in building construction) is 20 A. At this current, whcfkm y19a sb16at is 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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