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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://autoconfig.51fly.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://autoconfig.51fly.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: physics  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 into electri)zugk n*k1tpyar. 0w4 cal ener rk.zytpakng1w4* 0u) gy 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 thrys)i*b u/+cm gough a wire's full cross section at an/*g)u+ ismycb y point per unit 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 b xxaaba 0vv4a 0+0m:*b pxjdcn 9vbv:1e 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 ;e *nrl15qi x;kudv: hthe 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.o bbx4;*bt9 hv" 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 asfx sq)ohst4u-c389sduc76 a p

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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 wiru*; b0p0pwcuza4 wi7qe 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 depends (l4npjj. 57 ez*xmrnson

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting material )lm k.2t 82kfhzv1hachas the lowest 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 thexozlw ::29c qkd5kemq8 qjpig a+x7;9 resistiv +gc89px5l:qwi z97mdk :a oxe 2qkqj;ities 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 the hukoy2q:+.upl o,- nfresistances of these twopnolhf.:uukyo- +q, 2 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 has twice the cross-seg56p9co p(y1jffwvy*zj:h) yctional area of the other. How do the resistances of these)y jfjp69h (zvwcf5y*pyo1 g: 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 wireklw;bb.k5pn-1.s. d fbh6 mc js. One has twice the length and twice the cross-sectional area of the othekf c5.dlpnbhbmwb1 jk6.- ;.sr. 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 what fa3 yhe2ekon chs, ;hu4/ctor does the resistance change?hceks h2uh, ne /o34y;

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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 bj:rz6py2c 1n+qk) edrod have compared to a 2.0 cm diametpk6y 2: +b1qdncjr ze)er rod 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 sd b (q3gl7he*job59ia ro7m 0common metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature cw;kgojur- l)ns5zwwl1 *0qsq.m en xmc: .38qoefficients of 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 toikngbuwl xvpy7l3-, lq wk6 f,62/k+b?

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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 to thjeev 7f*i/0

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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 constanb) +)h9;q dbu zmrhd, +zi:vqst voltage circuit is doubled, the power dissipated by that circuit wills9+mirb)) , +vhz;q:b duzdqh

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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 c 9l3e;h-bc ahl st0i /7ov1payircuit of constant resistance is doubled, the power dissipt-lihyb v 7h13;0ps/ aaoce9lated 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 ewr trft;d; .mn2dk7i7e9:ahis doubled, the pow.rm ein7h 9wa;2:redt;kt7f der dissipated 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 constant res8xrm,6wqet j39 z/qft istance is doubled, the power dissipated by that circuit wx,ttf9jzr63q8e qm/ w ill

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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 bya4; xnyot os1p2 fr5.bta +7zf71nsh p 5.0%. By what percentage is the power on a resisbo17f. 7ypz p tntsfaah4rs +x 5no;21tor 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 sinusoinh1 xfz261,ah ojdt+ydal 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. One wire has tv,z00h wi jej2d wew,a 8s76 tr:nwkp0wice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to the2p snwr0 6v,ida:etjzhjw0k0 ww7,8at 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 resist g1f6b5 axbm(wivity becomes essentially zero at very low temperatures are 61mw5f a(bxgbreferred 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 chargextq nq/ 1xb. c+ucsyu-4/(qhv 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. Why o b2: 8y*h nt* 8ftyftjmc0(cuh;(nh:(rfjxat is thef(j( ntyuthtnrc8:y b: ;8 o(*j ffmh2*cxy0h 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 curren)4uu+: dlx qfmi6dp+qt 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 flowing k(k p:afnl871y. xwng8coia.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 14iz y5ow5:*tlopoutl- gt ,zu/gw5u-0 min. What is the n:4wz-gyl*oo ,ztgutu i p5lot5 -w5 /uet 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 proces nu a9hdb4wuk5n/f*8ws, it is desired to deposit 40 mg of silver on a metal part by using a current of 2.0 A. How lonfbw uadhk5/n49*w 8 nug 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 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 requiy yg 9+f;gcn8pred to cause 4.00 A to flow through a resistance of 330 8pgg; 9yfn+cyW?

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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 curren zzc1wg 1fj(yp5bjt9)t 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 bu d3gowsbjf(9 1es3 *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 i7/ ff okd.bne:x5.41unjmz x nts resistancek1fz4. fodxjn n7nmueb/:x5 .?

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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 connecte3rq62qtrdq + tk3qqk ;d to a 100-W resistor. How many electrons flow through the k+d3t kr tqq3r6qq;q 2wire 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 o6p 5oz2 yii+m7tk 6zoqf diameter 0.40 inch? (The resistivii5zq p myt+z2o6i67okty of copper 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 diameter ab 8( pzt*-lad)a gdv ;n;(9kpl7vqxs cnd 45 m long, if the resistivit ( lsvn 9 kapzpc;db q;gdlt*8-7xv)(ay 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;vqhson*idveo)e-+/ c+ q) cf)*; v nadncr0sty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 kv; cf,5 e7rke(resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, measuress4;z ar ks0rqcikj ,p)q1 v9l5 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 0.321 mmn8m;,ff q( sbj) nichro,n8q (fjmb sf;me wire if it is connected to a 12.0-V 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 long and of rectangularjm ud-.-q hi1zk bc5 ) 4rsyw0a4i2cud cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of copper is 4za) y.chsbq2u--m04 iwddj5r1u kic$1.68 \times 10^{-8} \Omega \cdot m$)

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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 had 1c:xafup,s3 s 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 wi7no xt f 9-p8ae 8p.8 dsf+zgbu8wib.jre (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 9 mhmgvim3 g.l+9u+qnof $18 \Omega$ 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 ofg9 m5hmk l9 t5nb.guq3 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 reul;4wq8.n5v9hb apm u( k- q3 x(6nnyvk9sinbsistance of the platinum wire -yamb(k4ui 35.n9pukn9 8vhq sn bn6w (;xlvqis $2.000 \; \Omega$ 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 thr v pr+.qe5w+jb72ld939xxoqbci- fp gough 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 curumoe z2n gs (-+u*m3utrent 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 much current?- *wb1kwjmy d2

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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 bc+ap*e 8ky2x9i :srzbl4 swl:ulb designed to be used in a 120-Vwyl+kr8e:b*:2cis 94 zlp xsa 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 heating elep- +ynd/qo *.kds53en ftb xv9mentkfde vx-d.spq *9/+n y tbno53?

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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 rrl+oi1loak v rx:ql +- vcr,y7r8)hf 9ated 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 r d1kuz( rb/b0rated 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.iia o* kx, 3ap2b1 7gbcfx6ao* 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 is its resizgce9y4u u,-f 0d5hys stance?

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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 dm :iuwbjz62u6 xcb* m2qft;iy 6*q6oon 110 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, if eneroxq93g.as( p rgy costs o(p9xq3rs .ga$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).i nal495gi xfsmly1-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 t *c3xp u;)qolao a 120-V line for 2.0 hours. How much heat energy is pl)o p3xu*a;c qroduced?

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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 doeb.s*c gv1j+c63hdokr s the battery store?ks 36 bcgv.dho+jc 1r*

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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 r/94dq )vgozs:bz,y 2o;mxra7ro 3 w yiron 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 compt*aly26l :x yfany charges 10 cents for each kilowatt-hour of eleclat 6:y*fx 2lytricity 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 hours per day. If elejr)t4 eo4 a(3k x:phflctricity costs 10 cents per kWh, how much does it cost to rk p4h)oxrtja(l3fe :4un 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 runnj:r/xcn6q7 ag ing a central air-conditioning unit for 2.0 hr/day at 5000 Wng ar7cj6:xq/, 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 af pabt .cd/v0*;pb1hh nd 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 onb/f tcpp a01 *v;.bhhd 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 flowzx:8s ;nv9- iypi+iefs through $8.0 \; \Omega$ 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 qm*g/q 2e0 /j9 lvcunmlh5k3 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 has 60% efficiency. Ho7ofd - u8ek-aaw much current does it draw from a 120-V 7kfe- -ad u8aoline? ($1 \; hp = 746 \; W$)

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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 fly8s3lm gtkq1 b*ny.p 3-rbn7x+ rwy2i ows through t3 1b32.t-*y+misqkwn7r l8 xypyr nbghis 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 cus3 qeczub.tqgynm 8v,* 0 n7w9rrent flows y,bc7*q9q0mes n .wtn8 z3vguthrough 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. W*j4u j +qg*dj 1se7tbtlu1(y fhat is the peak voltagt dbu(+j y11tjlsg*u4*7jf qee across 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 l(n- mox l+.,ty(zyd iinch. 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 electron carriersmx(iz (t- oyy.dln+l, in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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