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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 in:90bm n n6qgj5gnnds 9to electrical energy isg s50jn9:dn6m gb9nnq 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's full cr o)ro7+ wm mpl1l4b*fj 0i7ir 3f7wlsloss section at any point per unit of time is referred lo)+j37ilm0bw 4p iwlr1r* ml7f fs7oto 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 bx qzk/+mb8d*ih c05ixe 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 smccdjxu0w;,, ( f fjj7 9f- yjuf*6delame 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." Tyel u.dzgbr6 fy+l;.,his 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 ngk w0y6 6+ yiwtg,v3s9 n, tf6kts,lqwire 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 it f0gi3me- o0gs

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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 whfc)p0 7*ynsh adc*y*b . ,tdgire 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 hsdeo8p 5n epba1ia* 0)as 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 u ws96ha- nw/rlength of the other. How do the resistivities of these tws9r-u6h/a nwwo 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 lvro,)/+qjpbp *5 oht jength of the other. How do the r,j/* pv)roh+5pj tbqoesistances of 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 pm1zbd4qv1vo3 b9 ij (wires. One has twice the cross-sectional area of the other. How do the resistances of these two wires compar 1im ovq(pz1b9d34j bve?

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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 447qk;9 yqj( ujjmuublt5 6 dstwice the length and twice the cross-sectional area of the other. How do the resistances of these two wires cobj uj(6;4 5dsq4ky9u7q t muljmpare?

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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 wha /ey yos;z8)9:o jhtbtt factor does the resis)t9:yhb oj y/8 esozt;tance 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 havey ,h3iq2fgqu3 ikeek uu9y -yb4mn ).6 compared to a 2.0 cm diameter rod of the same lengk-ugbq uq i,i2my 4fy e3nh6eky3 )u9.th 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 moah i(p y c/)11jo2yejcst 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 resi 4/g/zwrza;6 t9nxyeistivity

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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 4fh;aeqg n5++av -uujto?

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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 equiv*px7l )bd1wblalent 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 doubqmmb 17p7qzoqi10hx-xf ;meu8 ,ztu0 led, the power dissipated by that circuit wil,u ; x 8 hmz7ifexzq1q but10qm0-po7ml

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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 resistancphtr e9;:14y e4iall we is doubled, the power dissipilte;aryw 4p l1h9:4e ated 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 is doubled, the p,jlwrw9wyx+fabk .602lsrwds7 n z:eidd )0 4owe:,+)les9y xrf2w 64az0nd0b w7sw d. klwjridr 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 resistancmluadm00g v9te/v d6 8b1n2aaujecz/:li8q 8e is doubled, the power dis1 d8vtd2bun8 az/el0u9a gqvma:e/8jl0im6 csipated 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 reduced by 5.0%.cpzx* k7z. gs6lov) +v By what percentage is the power on a resistoc6sv+z*k v g l7x).zopr 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 sinusoida: ,q2 ;wxq:cybyzgm3 et8aqw 2l 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 3.04xtih,4+p1 r htadv) o- eo.tj A. One wire has twice the diameter of the other. 4p .ttov- hat+r1,4j ex) dhio 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 zero rg .0qf3 vl ,)ydxbm;j,kzbr1 at very low temperatures are referred.v ,brgk0mfyq x; ldzr,)3bj 1 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 chargeq-g ywysp 5ubh4/6(d i 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 z8qfh/nmco9.de,le. in 2.0 min. What is the averanf /8,o .zh.l em9eqdcge 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 fcpesn.ri92 3b or 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 ifr+ql7kdnsotd z2;t):xps0 z: $4.0 \times 10^{16} \; electrons$ 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 curh)ul,2 b*; z mlui+ 6rrydt:kprent, has been left on for 10 min. What is the net number of electrons that have:,zuy2 ) i;p* rrlbu6m lkdt+h 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 d*1ck4+cg;uun tm31oiq ja2 g z4p 0vqaeposit 40 mg of silver 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 singly charged, and the atomic weigqta;cq2 +4pcg4 uo g1n1m*3 uj0ivza kht 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 diffe-nhoz r )36(y6qapfe+t9 b dokrence is required to cause 4.00 A to flow through a resistancn f6t-9re)ad(obkhq z+ p63yoe of 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 thrd fjugw.tu5;+)rh 0oh ough 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 is4-n gbk c/o/m7k k5rrq connected 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 df(o:,gvxqp. ) ftwg, draws 1.40 A of current. What is its resistance?,w:.tgo,g( )f p vxdqf

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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 flow thcbq 86j2i .mx1ddhkd 9rough the wire indkdj.bxdh i12 69q8mc
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 inchgy8-.brsncgd .r7fg te6q lv a3;:a6d? (The resistivity vd ..7a t 8alrsqc f66gg3-rbnd;e:ygof 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 and 45 m longkwuf xt/p mio(1+3 1x6:t0zz3/hgvk luv o6um, if the resistivity is oo1mk:w6 xhuv(g6 t/f u31 zkl0i +mvt 3uxz/p$1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 wirq +/)+wcn indke (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resi r2fzq e1ah):8 .y1vfk 5jlchnstivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 r8 :8fff;adxa yikf9 .lba: t40.040 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 0c2;vh 99 p:ozg ihp1xo.321 mm) nichrome wire if it is connected to a 12po:h9p 1o9zgix;h2v c.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 longxasp /ilqy3gm1k6ry o6 ,g6d / and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop al glyrd iy ap61k o,gq6//smx63ong 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 nbk++ylx;m e40.50 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 coppew)/k.xq. w9wggv hkd9 r 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 has a resistance ozm:jsx g gm as fs8eb g1fg0590v 8j4c9wsq;4ff $18 \Omega$ 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 resi qr25+z xnskzh80on 4wstivity 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 indiu ) 34ze4dz8ienw v ,3bqxgl-szm. The resistance of the pl zbl),zq 3d3is84 4wvgn-zexeatinum 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 througbql sz4+ mren3sl6r60(ga( mz h 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.k)0mvs.be28eg4 ai u e)tyc :i 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 8ze+ +lez;pmxk 0jn6e 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 designed to be usedhjzas:jj ly64: -yh9 id)ic3v in a 120 j:vs96h-ajdy:4zj l ihi c3)y-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 kmr3r ooz-bdly.n.vy,rj 2-:its heating elemeny2 . z -rjmrovn-.b: 3rkol,dyt?

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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 7 2;osjvk,tuj) w ;j7w3uruwjat $1/4 \; \Omega$. 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 atgdpzdcpc *f/ y7fzwie)3 n3;k0*0j / kyo i,xn $1/4 \; \Omega$. 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 )y2euq0spt8no tcj;j, 6r n,ndoes 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 wpnk c4d6)mnf 4/g ud*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 resistanl64fi:.rmy 7 k6pkc ij0ap;bklp2dg,ce?

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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 en1qe/ gps;oxz/ zj 5,swergy cosqwps /goze,s;1 x /5zjts $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 ho4o85/aui8fm7 c imu kfu4b4olurs?

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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 ;b/jzr (wr9ajt3k9 d -0fkzzm to a 120-V line for 2.0 hours. How much heat energy is ;kb9- t dj /krjmfz waz9(r0z3produced?

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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 a ; 4ipadifzrk*5vh9 2rt 12 V and 160 A-h. How much energy does the battery store?r5h9*kfia zv42d r; pi

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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 25suy1.8 7i3wl(rnfy ye-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.8tunr 4(u f:oxu21pw ile b9upq*(u-hv5 tcq is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatct2vofrn4( *5-pwi . huql u1tqp(uu 8 uxe:9bt-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 hours per day. t;dy dv0tyq .2 If electricity costs 10 cents per kWh, how muq y;t vd.dty02ch 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 bill included the cost of running a central air kg *:1alus tr8svoy---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 c t1u 8lygs -:orv*k-saost 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 gene*q/*bv xam- asrates heat at the rate of 2.1 kW. Tb*-qxav ma/s*he 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 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 th4f7p8h2 tgsm 6r)dlb omxt* t2rough $8.0 \; \Omega$ 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 kcr2hqjt*n;3 mg0 vp3$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 ratdg -;26kkeze(pvldq 6 g1; oite of 2.0 hp has 60% efficiency. How much current does 2(t6-i;egl 16kqgpddkz v;e oit 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 current flows e ihc,bxee27 :i2fawo3ni ) k,through this device)h fn2e:c , i,wkxaoe 3bi27ei?

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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 ns, o,3tzztgexh0 hw0/.3aef to a 120-V ac power source. What peak current flows through tef g xto3h,0s3 t0aehzw, /zn.his 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 a mi*5/ bxkorqny3/: uec power source. What is the peak voltage across this di5rk*xu mq: 3o//enbyevice?

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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 itn54;9 j(yktv t pozyy; can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is thzy;n5tk9 j;ypv4tyo( e 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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