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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://autodiscover.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://autodiscover.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 into el*ce jgl6:bs+e/gb l.cm ::yrnectrical energyl.:/j yn6es g:+gcb* :emrl cb 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 through a wire'kui uzo1 o; va-1h p:ew/i2ym+s full cross section at anyaw u -pim2u/+ooezvi h11;ky: 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 bep jvpx350aii t* :.myox-t-6spz hd co pk..(o 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 3 j:o0/vf jjmasame 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 of45- )iyvd7makq,x ;tax8 i hix 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 define,;b8ismz9g,j7wm j2ze1mxs x7 pc1zgd 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 b-efa2duv:5 6h7c ise lt63pbis

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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 wiresr,1 i:cg ,3ih pn3iui 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 matt /jpru -s7i m2g fk..j9:nyyyerial has 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 th7xihh8- e5l razj 6rz )zy bl9sp:.n5je other. How do the resistivities of these two wiresp 7s :zln6zr ry5j-).8j9b5xhazil he 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 lengc76 ,uroq,fqu th of the other. How do the resistances of these twucq6,oq, rf 7uo 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-sectional area of the ohl0ffry8 (uqs*h85m wther. How do the resistances of the0uys(8hqwl8h f *frm5se 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 a+ mca4w-5jz6ldbnu h3nd twice the cross-sectional area of the4whlcam -ju n6 d53bz+ other. 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 fact1k .kzb)xm ml0or does the resistance change0.m)lm z kxkb1?

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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 compar5q52o8)xzvkn mr mzy :gw;f 5qed to a 2.0 cm diameter rod of the same length and made of the samyqz:r5;xo8mvz g) kn 2f5wq5 me 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 mep:)rq/u u+d qxtals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficien zyvakd8 sr95e*xp0nc)-a dx ;ts 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 t nhlq: 3vrnv q9qe+c38in wk93o?

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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 e0frp0t ;paf/oi(s,a xquivalent 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, thw2klcpjx t n4tq q*8 )rsj90d3e power dissipated*qj9j q 04n rtx)w tdls3k28pc by 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 doubleigliy5x-p32a ;fo ar6 c/e3md8-dnl jd, the power dissipated bl-d38a/yxm l2 ieoar jip-c6fg5;dn 3y 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 ye8g 7ktcyj2 hs58cq /constant current flowing is doubled, the power dissipated by that circuityjq 28h5c 8sk/ gyec7t 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 flowiasq7(:tv , -o bqbrpt9ng through a circuit of constant resistance is doubled, the power dissipated b vat,:bq-7srop t(q9 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 v :rse )gcw dda6,+t:ncoltage output is reduced by 5.0%. By what percentage is the power on adc ):, n6wa+ ds:tergc 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 6,f k nl/et4+hi3skkym/pb 8vwith 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 tws id(rzl64zl rp5y5 (hice the diameter of th6 rzz lr (p(hls45di5ye 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 res 2syjzwg:+7jn 1ll:o xistivity becomes essentially zero at very low temperatures are referred+gxj: swyn:lloj7 z1 2 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 charge pass a point in 0.30 s u w;p,r* xw9xljt;,rsro0 is/?

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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 :2eforv)cn *wb/oc+ s in 2.0 min. What is twe cv 2cbf*n:so+o)/ rhe 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 1*l:u7 py bdrhxm*;j tlct/e+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 flowhb*j1m:e wy w ty31c *8xj9myzing 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 pjld*p/l 0fmrd)a.y) draws 13.5 A of current, has been left on for 10 min. What is the net number off0ypadrm*d/ . )ll )pj 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 dep7 ooo,xj6g7 leosit 40 mg of silver on a metal part by usixl o7ge,o7o 6jng 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 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(rd,xuxa 8py 4 resistance of 330 W 4( r8uypx,dax?

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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 sn +7 ws*/ a/ufcbf :qx)faa)ithe 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 c,zrf- gqf1y,-7bh ss vonnected across 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 1.40 A of current. W- k5s9glz a b1j*tor7yhat is its resistance?a l19j r*g7t5-ybkzos

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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 tz;wmbzb6 (wp: o a 100-W resistor. How many electrons flow through tpwz6w( ;bm :zbhe 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 ,9nix)zag o7jk1it 5xof diameter 0.40 inch? (The resistivity of copp ja,) gi 5ok9itx7z1xner 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 and 45 m long, if tlezp3 k,m*5d:g sy( zxtb: b,mhexk:dpm zbmbtyz3g ,s *,(5l:e resistivity 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 (resistivitm6rqw0w.im 513ktiggdkw )h )y $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resaz f;. xy0of)g 9b5mzsistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, measuresm-eu6mj4pdy5t o(v u. 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 0f+.9n(oivcj+ ln8 a tygm24um.321 mm) nichrome wire if it is coliumy g+ 4f8v+ c m(t9o2jna.nnnected 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 rectab-2qg+ fs-9r n -;r ehspcw+hk s6pp.sngular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop-s-sf+9wns;sg- h+ rrhbp k2peq 6.cp 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 acuq mgjlld gg7z4m1yy21+q ox1l 03: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 wireau9 5aka-fqe6 (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 of6)l:k 3wpslkm4y6i qz $18 \Omega$ 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 of platinum i:z7yl8yq. mxjs $3.9 \times 10^{-3} /^{\circ}C$. 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 og k)et6s,(najy bos4zxu 2mj *wha(7*f indium. The resistance of t k6 )4bg,*oytja2(naw ze7xjm *h(ssuhe 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 an,m+ ,u7 *mdz- fksuh5zy 9bqld $10.0 \; \Omega$ 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 1207wae)6q7l;tqkh 35 e ijnk2da0 W. What 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 much svypmnou0j3k ,ki1- sgo0o (7 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 ligho-y )k(v7c zgmt bulb designed to be used in a 120-(zc v)-gym7ok 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 resistance of its heating elembm.-l4 j43aksu yk20law u 7nxent u-au4lb3k4y anl 7kmwj0.sx2?

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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 pqh:kw) ,ssqi-.q h rqo64;vf $1/4 \; \Omega$. 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 atrb7l-- z 4dakbr)k;hejf0r 4d $1/4 \; \Omega$. 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 at 120 V, what current does it dra+ol jbinqao14i2c6)d w?

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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 nq 0g;*:pf,t; bwmg: wszrii4rg55vz 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 is its resisqf2-ec (v708 mja tmsxtance?

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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 d* hg5g8y*gi2 iwpmb7 energy cost8wibd**5 7y imgg2pg hs $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 hour:1bx8epns hprtzccg l*1 k0 ft7(, g3as?

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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. Ht s:hui4boh 10 gk55 pj1n7apeow much heat energy 5h407p n s1:i aojtbeguph 15kis 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 160 A-h. How much energy does the battdicqh75 j(n l*ery store?j (cil*7qhnd5

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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 8.0 ho-voc0btzn 7nib uc(o2r; ) +7t 8hgjcdurs?

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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 8ur- ) ,d ucu1zxej(zabulb is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estima)dxua-1 8uru z,j(ze cte 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 moni-qp1r3jxnp* q 9c hnr9tor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how muchr13- pp 9qcqn n*j9hxr 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 fng56f07ih ncbill 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 0ci65fn g7fnhitems 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 a v+uk 9f6uodhic6d+zc:k /62 g7fcjys 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 t/f9 kh+7cdifokcg j uu2cy6z: 6+dsv6emperature 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 flowx7 u yti+vthu*t0gpo .(8 6skes 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 x +to 4*n0y: uwizz0ez$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 hp.v1 gtcybpe v/,ii87lr vw8m 5xh)8 has 60% efficiency. How much current doe8/ mw7iv8xt8epg51)rp,c ih v vh.ybls 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 to a 120-V ac power source. What rms 0q ym0; kkbffcluh980current flows thrl ;kc0y bfufm q00k89hough 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 po;lb(a(+mn zrv wer source. What peak current flows through this d;ma rv((bn +lzevice?

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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 cok 3 j 8rff.zx.v.sdg,xnnected to a 120-V ac power source. What is the peak voltage across td3.xk.vjsfrg .x8 f, zhis 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 0.08 mggxvc .f q+q)lxd;)/mt01xc1 inch. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, whatmvdgcq+0 xm/;.1qlt f )xxc )g 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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