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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://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://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 elihj; y7 5ek,mtiya 2+dectricity by transforming chemical energy into electrical e jdy7atiy+2, ;k m5hienergy 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 :gms,cs0 n.xvthat passes through a wire's full cross section at any point per unit of time is referred xgsc,0smnv :.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 convv(/csrndk6(l ention current is taken 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:91,yhu:vzbp wk2ubi w)c u0t 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 ratebt+39.a7ysl7emww la d in "amp-hours." 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 dqkf g3x+k) c;wire 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 y/ a3nx/te9f mh;rep1wire 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 de4p+95gkn+rh3 y:tg 5 pf32mhpt:qlx4c xnqxypends 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 resistividqep pea5i4,1*jh :(ho/fttis +xzv 0 ty 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 d k(*.pqr(xe px3s;n 1+lefdsxo the rq*snl(x1+p(;p rdf k3.xxeesesistivities 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 thahsm*;tmxa 0q 7nd 5 u-ek;e-je resistances o5maq07 -exn h;t*jsa; kudme -f 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 has twice the cross-sectional area o-8-h .lew6 mgsfhr 1tcf the other. How do the resistances of wtche.h rls-1f-g 68m 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 twice the 9c3xbv) f4 ,ek1ia.kek9xpuja/:aohcross-sectional arehvakocpu,xe.)kaabj i /3: 9f x4ek91a of the 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 doubyc-+ kfbm 34zvled and the radius is doubled. By what factor does the resistancez-m4bkc3+ vyf 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 havzb. jxacpw4w9y0o3 s6 e compared to a 2.0 cm diameter rod of thj3wz6ow .p0a sc9b4xy e 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 common mn 6myuo+c 8jl4xy,o5betals

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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 resisn qww*h4s.7qjkocykx* w m(vf6w1 i29tivity

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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 tj,o1.ych(g8l peeh 1zo?

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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 equi8j0p;nym bnp9 x (8jd zee5oh(valent 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 powervtb4rn0.:o v y dissipated :nbv0.ryvo4 t 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 iq+cx2;n y.qcmhz )1 sh6t.pzm s doubled, the power dissipated by thamz 6..ctpym1zqqh; 2h+s) xcnt 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 45cll+ tj-wz( )rm p+fsiot k/)z a:pya circuit with constant current flowing is doubled, the power dissipated by thatr )l(i+t+j po wy)4ascl- m5/ftz kzp: 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 constasl 1e-yohf vz o10z:e;h02bb g eyis-te,xe ;;nt resistance is doubled, the power dissiez1v0o ; ;s-,e;gety 2hx 0ohysz:1 lebfeib-pated 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 output is re 5my-st7ci-gy duced by 5.0%. By what percentage is the power ms-c-yg5 ity7 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 sin79y,vu iv umh1usoidal 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 nc 6, +-rzuh/zid4 mdzjb+c /q3.0 A. One wire has twice the-j4n, qurzz+cmddh6/cz +ib/ diameter 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 thepvkpsz5bmp /hy,c9 : . vk99no resistivity becomes essentially zero at very low temperatures are reky/hnz:9 bk95,v.voppms9 cpferred 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 poix+ )45qbihvz 9 r1yxrnnt 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 c8 6bmzlzwj9ae +,5dpvli1; oin 2.0 min. What is the average culpj1vd+zibe9w; z5cm6,o a 8 lrrent?

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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 l.dve1a2e0 vt10 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 flowing)pjdy0 f d;hg) 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 crg ;p* f gvo0jm,/oc6kurrent, has been left on for 10 min. What is the net number of electrons that have passed tvp og* go;j/6 f,r0mckhrough 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 a metaihnd3 ,g82qi .hd5d4 b1qkaeb l part by using a current of 2.0 A. How long must the current be allowed to a h1ie8 .bq2d4dhn3, dgib5kq 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 :e-tyux/ 1:dfs0yq sc4.00 A to flow through a resistance of :qc0 ufs ytxd1/y:s-e330 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 e*r0ie za(wl+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 ac-pluf) h4;wt hross 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 curup527xs q,ir d+d,zyjrent. What is its resistance?d5+ j ,psirydxz27qu,

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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 hg*ft ec(4h5 na 100-W resistor. How many electrons flow through g (t5*fchhen4 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 resistan 1mcpoclf-t1efh q61 v7wo3y(ce of 1.0 m copper wire of diameter 0.40 inch? (The resistivity ooep3f1 o1-y(wmf6 q 1l7thccv f 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 i vg9f*uu5 v9t.6owe5v cewan /x7zx5ln diameter and 45 m long, if the x9u79fw65n wxelu/g o*e.zv 5vvta5 cresistivity 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 (resis oya0qqg+mj3(tivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resiwr0innr er 7yv)d *puhe 3, ;7 u+2oi+iuomld:stivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 o ++dnafq+0md 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 gyqn 7fjejni ,m 9.-3tis 0.321 mm) nichrome wire if it is connected toyj.,e9tg -jmf qnin 37 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 lonwu 56o1 kkqaf:g and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop alonuqwk16: kfa5og 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 0xuy8h5 e*+k ox.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 ym .s -(uzd rt7tdz2:attw h--wire (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 hask y,9uu-y xs/i a resistance 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 of2():pt6ow3 n/d hbs5nxlzk 86xw lucn 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.n/ac m: 0ii3th The resistance of the platinum wire tc ia30mh:/ni 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 th5so w+gl:i:narough 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 rat 8rmf9+di,pg7x alp8ded at 1200 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 rh )y wir20e h g,.v5a,hxjdk(tunning on 110 V draws how much 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 dlo4067mn ea se/u;xk jesigned to be used in a 12004ekom sxa /7u;njel6-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 resistatmok;( 7axzc:nce of its heating element?o(7 xzck:;tam

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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 kth1j82qqw0 3u kj+g*tanvh6 $1/4 \; \Omega$. 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 rate s a+of-9+cvnrd 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.bm23p;r 5j alxv aqa+j8 dy.cv:zk/pxe2 )r)l 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 125lw-:u a/ p w (puewi0ahw5hd,hlu,;b 0 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 resista+ug40q di*q lm -on-kjnce?

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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,8dpdo+mwnkj 3/xm8 j for 8.0 hours, if energy +, kdjm8 8w3/ mjoxnpdcosts $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 i9b wrx+zavr a k9 ,qv8g(w-.awn 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 hoursub:rcyd, or (n n4-cl2cu8j7u. How much heat energy is produc2r, bc:do7l 4(8u-r nyjnucu ced?

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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 eneatmqw;-nxgx ybs*1)zd9 .fbw e0/ )iargy does the battery store?*./s en)aigafb 09wt; -zw x qbdm)1yx

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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 fdkel(toev n0 i7 q4w)+gs+zpg 0 4ct)25-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 pedvszd++. upfvfi1l+d1+q.jth 0o b f4r day. Assuming the power company chargesvu+0 ++d.d+o ltbdjfihf1v .szf1p4q 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 (computeg xy-00x-oswlr plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the compu- -gl00ys xwoxter 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 ofsmcy yu(n8b392qvg0 i 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 electric bill if electricity co cs2ny98 b m0ygv3i(qusts 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 p; 8gk8*i 5tf(4 kubihpwmmf/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 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 p gupm/k( ;fk b4 hmiw58*itf8heating 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 th y6 nhn+tk,oj)rough $8.0 \; \Omega$ 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 kjqfa 3:i2w5 )ncsre +$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. How much ckeh+c*p c2j ywtr6a -iq59z6e urrent does it draw from a 120-V qcij6 ec 9*hptkze 6y-r5a+2wline? ($1 \; hp = 746 \; W$)

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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 pow(n :yep dvxuh fudn u97:u74-f c97suqer source. What rms current flows throu fuduuyuf ( 9h- 7:n:n47qc xu7s9evpdgh 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(cqrcmk5:nsh0, o ux ev(l55a power source. What peak current flows through thivaclr0u : s55,qkon(em(ch 5x s 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. What i5ciz5x nt1 ys zjwp190s the peak voltage across 5 xcz1ipsywz019 nj5t 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 0q5 gb1acn myc4ik:b7 fthw/ uwa7: d3:.081 inch. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this cur iu f4 3c7aq:wac5tbg7bw:ykn:1hm/d rent, what 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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