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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://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://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 electricjh2 wvmfp6 8v5ui)q5 val energy is calledhumqj wv2)8 fi v6p5v5 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 q(-3undsye w6b0o gc; full cross section at any point per uni 6e- 0q nuwbo(g;d3syct 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 c7):b/t mvq zyaurrent 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 77hczeoylk ,9odj0fpm n8,b6is the 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." This is a measu1w,o 3px7jm kag8te4b1 wmmo+s*a ke;re 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 definedb ;ky8 au)8kiprr4 bo9 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 w je cobckejv+ i (kt/.dgkis 5h2581qlrk/)8iire 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 depentg7 .um .*zr2m mcqzu,- bfq,fds on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting mate 98 * 2f/ ha cjpu,/npftucwe5zv2kii7rial 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 the6qq6a. b8o z 8z7qlvit other. How do the resistiv8za8 lzq. 7itbqqvo66ities 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 xzi sgwl mw9eq-.,:kwr3 l(*i length of the other. How do the resistances of these two wires co:k9 3*wl ql i,ixr-z.w(ew smgmpare?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wvfpen) 9n:sd:c:2kev ires. One has twice the cross-sectional area of the other. Hows9 fekndpvc:):2n v :e do the resistances of 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 llmgl rtuu8f7p4;7 av *4t jrgk u60qb(ength and twice the cross-sectional area of the other. How dkj(b u7frtptlg*; 086 4 agum uvl7r4qo 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 ii3hokj lbo )12s doubled and the radius is doubled. By what factor does the res)bk2 1h3loojiistance 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 y2uh 41 qpz tnp/8 yu4incx2z,does a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and madei npyyz1n2 4xq4pc /2u uzh,t8 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 meta ar;f 807.iwemwrx(tbls

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficit0onlp;e.g/)rj2n a eglnf// ents 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 to?lq;p 0 .wwx7w k pktub.)+sz9z

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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 es ye4 +rf5o:okquivalent 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 doubasg3f2 y3m18g f0nh asled, the power dissipated by that circuit h0 fgfssyag38 a1nm32 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 cirk96y74bpav y jfs cd/9cuit of constant resistance is doubled, the power dissipatsk49cpj yf7d6byv/ 9aed 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 chm(t7,ko-tp lqtf/ /j ircuit with constant current flowing is doubled, the power / t7kth/p (mfjq-l, todissipated 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 resistance is doubled,f7 ,) dp(rxwpk the power dissipated by tx(pkr), fwd 7phat 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 o,9 vvevsm; pzch+55jo +99zsrw) tpx output is reduced by 5.0%. By what percentage is the power on a resis9+hvpoj p9v 5o9wct s)zm;ev , sx+rz5tor 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 with respect to time is referredkj7onpg+dok+4 t,8 sn 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 wmcl)k 6nr 02imires each carrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the nri2 mk6m c)l0drift 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 thex;c (*w(-5 hizmptbul resistivity becomes essentially zero at very low temperatures are referred(zxu*i(p mbhw 5;lct- 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 cha+ 7ns7k*v tqexrge 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 electroplatinvj+ f0)hu8sfp7i:h(+yrh -eyo h u s/zg apparatus in 2.0 min. What is the average curh8zf f7- /jh(+)usiyv+: 0u hysr poherent?

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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 po,qy4u mcii nny2*n6b95a x:f r3g7k qdint 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 flowly.9/m 9ozaj5d li 6ikc+8dhwing 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 10 min. Wbb,b2kb*-g r o(1ouuz5 itka:hat is the net number uo5ag( kb,:kb*-rbo1u ztbi 2of 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 skz l)n8d)b2xs, it is desired to deposit 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 snlb8k2)dz)x 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 diffeqjzat7bje pc32 9) m867mb mxqrence is required to cause 4.00 A to flow through a resistance of 33mxz 6a7jp3m m8 et )bqq97bc2j0 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 resist:+0vpczam0p mor 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 across 220 V. What current wiltga07x( e( 5s qequo1g 9nl2wyl 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 curretso4ql8v 7,r hnt. What is its resistance?lhq8vt,s7 4r o

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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 qlu9nqcq 9 *9rmany electrons flow through the wire inql9qu*9rncq 9
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 3g(nq9- qcy 5wfms fu7copper wire of diameter 0.40 inch? (The resistivity of copperf(s c3qg fqy97u-5nmw 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 ie4y/ y s (;,bdnb33:m)pba,fokjgrirod 1.0 cm in diameter and 45 m long, if the rejd 4ay ,by)f(o bmp:k i; 3resi/ngb3,sistivity 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 (resistivityp+gl *p0nec*,xuk rp( $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 wireldof 09nrs:+z (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. Wha69 e1*cezadf6( (t g kgazkum i3*h-qvt 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 (t*0xw5)6lh)r. aom1 hi3i h3qeodjyy fhe radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V batter3elim d oi.hx o0q3hay)fyw)r *jh561y. (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-section, 1.0 cm x (b qcmy *l52vd2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistl vdcq(b m*y52ivity 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 ybpg6)zkv*o+u g0z i6of 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 (resistivit ,j5gugxb)kmjt9;u3uy $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 o erez7e dt5mxd;t/l42 f $18 \Omega$ 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 coeffix;kr ao; u8o7i6yi 8kg2 4wbdmm1h )clcient 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 determine the melting point of indium. ,zt3 8gjc .g5cyxf*ftzue:5g The resistance of the platinum 8c:g.c,jeft3 * g5yzz xt5ug fwire 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 a/go5la1c6 elb t ;ju6sn $10.0 \; \Omega$ 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.6x/u( 0 ca7mydbskhm:zuablf n3* ,*g 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 m:lx5kaugh:- us jcidt+;oh -/uch 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 used:2hy, gfuk m6iq+lu6 h in a 120-V circuiih, g+hf2q u:m6yulk6t?

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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 thl duvy5,fxi2 :ui8+fhe resistance of its heating elemeny,8idifu2+l u :fxv5h t?

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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 mk:uv14tnikk 78 9z,j1g nbf qat $1/4 \; \Omega$. 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 rg(*64 g oby)5bbipqly +04pt fzjnk6vated 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 it2.6rk7wqbb i u 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 resistankh0pyi pxs1ykd7ma r4yc-3f 9n-w5v6 ce?

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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 resis+ ew*1v))4kd8 hju7wbmnqa yxtance?

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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,v07e 7n,r fgvl-ky ng,u9bha5i*g xr5 if energy cos,*ggx 7va b5un0kyri lhrf,gv5e-n97 ts $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 lightvoju-zndgy+t) lg 48+ 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 to a 120-V line for 2.0 hours. How much heat enery3ynkoo.dq6 ur+f:: egenrqd3 f oky6oy:u:.+y is 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 1q2eke:yrr +g7wsupz i(f,a8h1*0 3 aj5azcct2 V and 160 A-h. How much energy does the battery store?g ajrespa eyuck0 h,tw+8a 1fzq:*(5z2c7ir3

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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 ped 5a;:nvw w*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 ,f dgu(2k0 7 qkj:jfykid u3jvls2 a1010 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to operate th : l0djd3kjkf k(y2,1fvqs uag7uj 2i0e 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 turned3tvtxf6-ma96* rt*o:exwhd uc) th9u on 8.0 hours per day. If electricity costs 10 cents per kWh, 9 dat9 v)t 6o xm urfw*6hute-*x3:hcthow much 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)qcdl/ ogp*go,*, d9bf electric bill 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/ f*pd *gqod 9l,boc,g 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 o c borhah;ch31lb f ,s(/hw8e*perates 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 th(s*hwer ac8b/ h,hb;o clh f13e 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 thqpi,wap/fx /+jxg g6akn 7 ,i/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 iq7,k7kk.yxd $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 j:8:j/dpm q4 2kihegs hp has 60% efficiency. How much current doessdpmj:4 jq: i/ehk8g2 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 conne p8pn5 top,l2lcted to a 120-V ac power source. What rms current flows througl,ot2n p8l p5ph 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/ 1u*typ*shlh ac power source. What peak current flows through th/*1suht l pyh*is 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. ;a ljpm szp9f(z1a2b 0What is the peak voltage across this devicb9(0f12 ;sazjmp alpz e?

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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 saf(zbw ;2ts izn4e 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 carriers in ;z4 nz(bisw2tone cubic centimeter of copper is $8.5 \times 10^{22}$.)

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