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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://autoconfig.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://autoconfig.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 s8yr c /tc(p2pby transforming chemical energy into electricalr2y(c tp/s p8c energy 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's full cross section at 4+ vit; 0ylramany point per unit of time iv ;lr4+i ta0yms 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 ktt7+jag4dp8 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 sam7k1wx e-jvp4t e 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."fuxxs6xia01 id .a3v ) 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 asnm;a bbg w.l*:

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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 5wo2ldajj-6 y nofc51wire 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 dep;* owaczj)yu 0ends 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 thei xpg.5 y)ddgsc)08b o 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 le x(sw owavauw+1),e) ength of the other. How do the resistivities of these two wires compare awau)v,w1)o s(ex+ ew?

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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 thi 2- bimhq inei/glje/87y0,ye other. How do the resistayl2/e ei ynb-/8iimjh 0,7gqinces 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 wires:)xcst d3jq. b 0a9pua. One has twice the cross-sectional area of the other. How do the resistances of these 9a)juc:.qs3 pdatb0xtwo 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 cross-s)zwzm)s 4zjusx :m1qdj 7q f1f0-ti.pectional area of the other. How do the resistances of these two wires4t- msu1 j1fpqqf jimd szz7z):. 0)wx 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 radiu tos.tmb(4;nl s is doubled. By what factor does then; (motb 4t.ls resistance 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 c vwqv7m 7h85wadx,/ 5m6v vzgvm diameter rod have compared to a 2.0 cm diameter rod of the same length and madm ahvz/vvx 8m77wwq d5,5v g6ve 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 commozx)z n1.dd, fj7+c apmn metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coehypw wpx:x ()i fo03n8fficients 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 equivaled9*w);jk ecq mnt to?

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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 equival nh6,qdu2a d8lent 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 circu.(1f ck/y9il82g- ihqdnu egyit is doubled, the power dissipated by that circuit wilqg-/k y.d gel2iyfu19(i c8hnl

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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 doubled, the 3q-v.do of )mvpower dissivo.- 3mf) vdqopated 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 dcc6tyt- jig;h)v c;/ with constant current flowing is doubled, the power dissipated by that circuit wi/ hct)6jtc ;-;yigv dcll

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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 ofch9fak* moati (9(v(5 qg4kon constant resistance is doubled, the power dissipated by that circuia o*4i a(ov5(kgnfq(mt9khc9t 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. sdx,zpy9e .y(dv sra05dnh( is reduced by 5.0%. By what percentage is the power on a resistor a905hy eszr ,a.d.p(dsyx(vn d ffected?

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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 respect to time is referred tof30x)k,pl; z qa:mwc m,joiq( 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 car* *d cebuwbgh(nh-f3/1e9qe wpk9p7z rying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in t epe(nq fcz1dw3- ewg9b9 up/k 7*hbh*he 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 becom8(v qu1 jppbk6r dol2;es essentially zero at very low temperatures are referred to asub2odl1kp6 ( v8rj;q p

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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 ik3)iw5 f+. sr1 f8h(gm ggzgupass 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 wr -hhzs**06wlemeq hzx+;2 g2.0 min. What is th0mshwl h+w **r6qe zze;2hgx-e 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 bm)s-v(s zsk (z/ /ny t4zvua7by a 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 flow zr h;dgj5l ch/quz,,oq hb hpf(,/t65ing 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 d42+mafdr1 zs-deysb 0 rx3-i draws 13.5 A of current, has been left on for 10 min. What is the net number-x d -0fdaseid431sbrmz yr+2 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 process, it is desired to deposjwfgi3b5a (d ;)amidt/ l4y*zit 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 io*5dzw mlyabda(3 f)gjii t ;4/ns 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 requir i g4dr6vujag po5z*i;:7- pve ;h8bfsed to cause 4.00 A to flow through a resistan7gisd6oj-*;54 :8apvr;u h zebpi fvgce 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 through it isq2jv2, a )zs: hj3deuu 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 tb;-g x;s r7ys de3.w qsu(vf.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 draws 1.40 A of current. What is its resistancl73jw 0fpi u)n,qux4 nej0 i,upl n7u4)3fwnxq?

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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 rrn35)*;/t bh6u c n,xdqv qklkesistor. How many electrons flow through the wnqqbtuv *;k),clrk d53x/hn6ire 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 resistancev , ;5w 6-cbgjxpieim0 of 1.0 m copper wire of diameter 0.40 inch? (The resistivity of coppex-em,p5 6gwj;iv cib0r 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 rode cvdcr2 zd22n;/ bif4 1.0 cm in diameter and 45 m long, if the resistivin/zdvbcf 24ri c2d2e;ty 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 (rvz p2mfaki7*i9 7lf, aesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 w:4,r7pnv c ndjire (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, measures 0.040 ohms. What is its resisue,6o h qnqp lpg94)gn 8h;yzt*z+ xv2tivity?

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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. e1r sw4elev*xby6);h0-m long 22 gauge (the radius is 0.321 mm) nichrome wil xw61 eb*s;vh e)rey4re 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 rectangular cross-w-a**j l v t+jd+k,qdksection, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carr,jtqjk **dd +awvk-+lies 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 nik o)wwf42d:pc- q) ix3p gbg scx(qv*(chrome wire has 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 wire (ivy5a-s /rf z(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 resistance0hkk/n*, fhbqy- - zvx 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 coeffioa3ld8x8gv2( -fg idj( mb pln+wj+1r dc +.zvcient 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 ep,ehi+lng )cqv7n8 6determine the melting point of indium. The resistance of the platinum wire c+ eh6 nl)8pineqgv, 7is $2.000 \; \Omega$ 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 etiygyh4a*vg a6oh n12xnd5*. 0m+z wan $10.0 \; \Omega$ 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 c-x)xj6a w: aje)rqqj080exd2 wpxg o/ urrent 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 currenz3ltrnh37/ab- w2wbo4 q zu,pt?

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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 bule3 p8-k - 7psy:i (bum4bbyzrzb designed to be used in a 120-V circuit?z4 ze 3imyp(s7:kb- -8yr ubbp

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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 heatinb al 3tg+ed/biozv5+- g element?bd/+iboz+ -3lvg 5et a

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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 ra)wo0+l9b6ctc kq l,lo ted 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 rated a-+j.)u hzb o.ag n*+wdyk:tc 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. If it is used at 120 V, what cur (8iqos,kk1 qqrent 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.p 6t/r /y)9la3wtuj6ta 1gxip If 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 o oxpkj5*59t3bibzq1l n 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 energq ky( pr3 b5ad7mt 29xxp gjd wr9)enu,l7n)1uy cost)(79g)jm3puq,tk px du1x 5nb9ndw7ae rlyr2s $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 ar 0r*v(3l bypsvx z6*u 100-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 connectedm(g+j 7td aew ybm-,.t to a 120-V line for 2.0 hours. How much heat energy iseym-(at7+ mbj, gwdt. 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 1ei,t/ w,gm clwh.+5cqbe6 r 1d2 V and 160 A-h. How much energy does the battery store?/cbt g6 cl e+w 5wed.,mirh,q1

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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 soldc 2*iz,:hjcrn+z ia7i ering 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 bulzqgy 1u0mn.a9e ou*q8b is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electrq* nmyo 8u1u.agq0 e9zicity 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 hou l5)11*;zy 0ybjbi y3d oo2bmlwzc.b ok5s/zurs per day. If electricity costs 10 cents per kWh, how much does it co/1zz solmzjbd*b2b oc0olyi1.y )y5 ;k35 bwust 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-cem(p-f3y-nrkj (lsbc l9 yz06onditioning unit for 2.0 hr/dyz6c3-pe knmj0l9s l- (frb (yay 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 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 opera*os*abf 0ba(8e r h,sbw u*x6qtes 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 poxs rhfsq0,ba*(6 *bw o*eau b8wer 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 thr 4hg7( .to/kx .0 q,zowtehxciough $8.0 \; \Omega$ 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 costsix-a( j as9n+o $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 tp1 i*u)8 kapk w +u2k4ycucfi+he rate of 2.0 hp has 60% efficiency. How much current does it draw from a 120-V line? i c41ckp+ au k+8 up2*f)kiywu ($1 \; hp = 746 \; W$)

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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 lpp(su-7um i*rms current flows through this device ml(*7ipu s-pu?

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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 sourc lnpm(;3h uefi1c)u2k 6tw7 fce. What peak current flows through thputi6m(3hnuff 1); k wec 7c2lis 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 s (5led0*n z /qfm,llnhource. What is the peak voltage acrosq5ln */ edn,z(ml hl0fs 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 inch. Th+r5; 3 qdghr 5yp03wfiiiaqe.pk zj..e 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 numb.+rki qz.rg3 3i0 aypj5ihqe ;d 5.fwper of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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