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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 q7/8ddv h1 mjichemical energy into electrical 8hd vji 1d/7qmenergy 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 thrt6ek-85*u r w. hydfwbough a wire's full cross section at any point per unit of time is referred tht6w.fk8wb* rdu y e-5o 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 taken8k/qo bntlp1 d x;s1sg.8rz h-w-qs n3pz(rt+ 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 the saxeph: kloi,--eu 4r/jme 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-houycio +*g :iyaza .0a8urs." 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 definjfd1o79hm:io n 7p/2hxky6eq ed 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 wiree wdiz88 pq,6c. oh;gx 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 x; *-ozk;werw wire 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 valr erw+z7 d *c3hlqm.2wue?

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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 othertf *eqf.xu ko/k+ t,9x. How do the resistivities of these two wires cou.to +,9/k* q xkeftxfmpare?

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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. Oaq-f,)le jlo 4ne has twice the length of the other. How do the resistances of these two wires compare?q -fllj)a4oe ,

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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 cross-sectional areftks+96cyappuk** l1 a of the other. How do the resil u1yp* p* s+ftkkc69astances 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 length and twiyvr/e5;n+ ihr ce the cross-sectional area of the other. How do the resistances of these tv +yh;/inrer5wo 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 doe mgf,9)n0xxqy s the resistanc )f0x9q, gnxyme 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 do,p63z5q x2 borg ioo7oes a 1.0 cm diameter rod have compared to a 2.0 cm diameter g,qio3rzxo6b opo7 25rod 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 moix smjln0(j1, o d11u06ybjaxst 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 of resistivity uz(+hpeib s//

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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 t, 6zn7u wv3o qhxqfdfh*.ux,0o?

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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 equivalentp4got m)fp j7fw9c g +k(-ng;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 power dissipateoam9.z g izx7/wrs+ -2o+qra(ik6 n,7 fwvi pkd by that circuit wil-9vkfzwir,zm+xa(+ o 2qoik7pg6 /a.swn7r i l

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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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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 resit g*o;erdo*nl -,yq;yw (a(ajstance is doubled, the power dissipated by thaayt,(n o;*odr-wge ;j l*a qy(t 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 constanmd8e mxa+uc 4x7u3ih4rj j(p w3yfn 1:t current flowing is doubled, the power dissipated by that circuit will (y u+mce4p4njj h3daf17 xmrw3i8xu:

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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, th;uxj9; e0m 6clp-njswe power dissipated by that circuit wij;n09ewm xp ;6lsucj- ll

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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, rj5d vd7a p)queyqn, w1x. 1)cthe voltage output is reduced by 5.0%. By what percentage is the power on a resistor a)1p, vcu.n 1j adyeq) drxw7q5ffected?

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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 respej8 g9dw( gq;jhct 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. One wire has 9m(qjmngp-u:pm girt .: i(:f l6qnz5twice the diameter of the other. The ratio of the drift velocity in the smaller diamm p5zp imlnmi( tq9n6u :(jq::gf r-g.eter 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 trudv ru cd.z y;3 09c2pa7u;cresistivity becomes essentially zero at very low temperatures are referred p au9 yu;v7trccd.u;r zcd032to 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 charge pass a point i(ll65ywh 6a imn 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 apparatumrk8ax2itvpah:5( 8 os in 2.0 min. What is th: p tko2mihara8xv(58e average 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 cur+nd1 h 9e:kyawvo:po7 rent 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 flowin aa-.9we+ glelg 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 Acc6axk6 9 mw. x.t38wj)vxsco of current, has been left on for 10 min. What is the net number of electrons that ha 6w x .x39xv mjt.sw86oc)ckcave 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 deposit 40 mg of si)a gmipn.yn4 0lver 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 sinmgn0pi) 4n.y agly 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 resi:kiwa 89zge)1yvuk4;dcbrt 2,)tyo estance o 92wcy8dza 1rte ,o): iby4;)u ektgkvf 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 through it is 5.0 A?hfb;woz;9qm4l/7tzxg yqrao4;. k0q

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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 across5h1w nowf,3 5mse k (2ucy;,tqryy cje(*hb(n 220 V. What 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 est01qdq q:v-xg ;ui2i nf:j3 1.40 A of current. What is its resistance?fv1q:qnijugts 03exd : - i2;q

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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 flb 7t(mpw7m ylf f,qy.mp49x8x ow through mly f48py7xb.(,q mx 7fmwt9p 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? (Thet. q1e78ll rii j eq5a 3(gyxfwv6-o9e resistivity of copper io 5i1yx6we8.rvgq (l itjq73 a-9efels $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 cirg0+)ug6rtdu 2rnku 2kcular rod 1.0 cm in diameter and 45 m long, if the resisnt6kru)ukr 2+g u0gd2 tivity 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 (rg ro8w-lzup 1:esistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivitya9 0uk,izve9t $1.68 \times 10^{-8} \; \Omega \cdot m$) 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(pxu r r5jr:zic9 nqf24 g.wdpge7(3rd2: ikb 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 lom3tvy.z s)5kjng 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-Vsmtv)35 z.j ky battery. (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 longez*p.o 3 *orlefpcokw00 d7/m and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop arw0 m zep* k0d3o7fop* /oc.ellong 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 radiusz bn9x.pqo(9 6 7hpps8,+rlwjz awwx7 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 (rvpqr2tt9e j ;7esistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resista 0/fp01 hyugrhnce 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 coefficii zb 6900nov)wqwpjn(:szn ilg ;q1 (nent of resistivity 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 indium. The resistanc0s 1johofqx zk)e3ubn4* e*8te of the platinum wirezbo8 ox*eun03)1jk*4 htefqs 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 throt;u3 u l0ek a,7yht;shugh 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. Wha5r24 rxuq *udut 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 on 110 V draws how majof; oe8ja86zs np7(uch 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 to be cpugahnbdk ; k.4lzby2wz-+ d0ze40:x q.mr2 used in a 120-V circ 4d+..42qu; z elkx k2c bz0mpd0hbnwz- gra:yuit?

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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 resistsp8tu ;-el d:sance of its heating element-uss;8td: pel ?

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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 at h rqil/0 d,z48zg)t 5kae 7ge0k0cvwi$1/4 \; \Omega$. 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 at) l,14y6pcmmfr jlc4 z $1/4 \; \Omega$. 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 bul51p6mrl0 r1l/wr:h c/3bs7dmtq cq aib. 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 bulb. If it is used at 120 V, what dd 0 l wxxj:t7vv5(yf0is 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 eqckxw 3 r9 ;:,im,;r.yvtcap V. What 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 cost to operate a 25-W soldering iron for 8.0 hours, ifd2, pe ycuqm., energy costpd . q2,ymeu,cs $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 10rm 68rqrr 8pqiz (-vt50rj4kr0-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 connected to a 120-V line for 2.0 hours. How much heat sb3e. ferju qzr 6tu3y9h.i25 energy 2j.6serz.bi hur 35eq9 tf3uy is 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 atx , cw(e,r)kac 12 V and 160 A-h. How much energy does the battery store?(e, cca,xkwr )

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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 8sgao muv9p ;af ./m-lbj yv442.0 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 onk y7rxpp(fa 9,fer,2r 10 hours per day. Assuming the power company charr 9( 7,xpfa,ekfr2ryp ges 10 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) is turned on 8.0 howm3 7ekn*9m kturs per day. If electricity costs 10 cents per kWh, how much does it costk me97kmn wt3* 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 central air j((:v0g: lv5mb, j7 blwaglva-conditioning unit for 2.0 hr/day at blvjb(m,a:5l: aj0 g(vlvwg7 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 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 z,t i.sar q3.t +mmh)wheat 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.) What effect will the repair have on the power dissipated in the heating el thzi,ra smwq. 3t+m).ement?

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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 thaht n2zh f8(- s6he:gvrough $8.0 \; \Omega$ 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 costaff1q epop5uz;789ex3w,vha s $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 awhr 4ha 9ymu7 ok5o36has 60% efficiency. How much current does iyaahhwo65 ro7 k4u93mt 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 to a 120-V ac + o(6 wg6jqwfxpower source. What rms current flows tj qf+(66wxwg ohrough 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 powevp77h3qh -t/n(hr; yje 1 gxsqr source. What peak current flows thro t;pqsj qvxhy7-hn3h7 (e1rg/ugh 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 a(w .ruuv.6 ,4a:ldyvd /hqifd )v+er120-V ac power source. What is the peak voltage acriw.v/ yr ( ru4d aa:6qd.fed)h,v lv+uoss 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 0.08ri3x/fi4tkq81c.4x y0hux w a1 inch. 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? (The number of eleq 4xu/xk tyi1x0fwra8 ihc.34 ctron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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