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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 elqvgd z6y1c1jv:d2gp7k9qq 3c+g +mv tectricity by transforming chemical energy into electricaccmvd q+j 9k 1 3+ggt2zqq:y1pdvv76gl 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 pv l /wvlaxnm, xw .qjs;0vx4 (.31zwqlasses through a wire's full cross section at any point m;3 aq,.1xnwvwv jz 4lvx (x. lls0w/qper 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 conve oh hpnz,7p3/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 same asi;fr wm gwf/-4

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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 of theterb,/i/m9);q 5pksf fx908cuk 6f esyra* seir

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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 ass dx:2d+y z p:hf*rvx9

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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 wz3k.zdiz(k7 fs/ nd:nire 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 dependy+)ex;m wad, 8l rm2lps 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 l)-)uei++4mkap s9m o ckdegd 0owest 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 the other. Howyy f 6)pqt/uh. do the resistivities ot yy/ u6pq)fh.f 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 d8qg-ab54 ums qmp5 0s ue+ic8po the resistances of these two wires compare?b0q ue5qac84is+mmp8ugs-p 5

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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 ha h,esw;t0s2vdr2p rv8n0 s;gms twice the cross-sectional area of the other. How do the resistances ofh;vd0ve0,m8t 2rs sngpw2 rs; 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 twicnqj( rnl.c,f* e the cross-sectional area of the other. How do the resistljnqr,f*c .( nances 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 doub0k nt a w.evju1.q69so-y5hkhled and the radius is doubled. By what factor does the resistan tnoqvk.es-wh.9auj y0 1k5h6 ce 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 aytupr ;hw4. xzfihh8x.wg -4; 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same lengt u ;t;.zpw.8 h-hxy4 wrg4fixhh 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 me 2hzsfktc55b. tals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coeffic -ioyer)p8v(w ients 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 equivalenqu97g2 cj:ap lt 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 ek3 sqwt8egp+ ((;ev dxquivalent 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 voltatzwc whn4op +7z 6z.h9ge circuit is doubled, the power dissipated by that ci o .h4whzc6pz+97ztnw rcuit 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 acros9sur3ayw*tyq ,:j *j+k l a6,esxd0 tts a circuit of constant resistance is doubled, the power dissipated by that circuit w s+k ,,yt*dt:uj*a6t sqy3ajw0l9x erill

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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, th w bc 0ylv6nq(:.usj 23btjp5we power ds30 2u(.:yjvwjplnw6q b5tc bissipated 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 thd (2, x 3r:i:mkj;mvietd+jc jrough a circuit of constant resistance is doubled, the power dissipated by that circ j(i:jkm;rmce2+:jd 3 vxd ,ituit 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%. By wfp8ajp7rp8w2 vcr36bs hc,1 rhat percentage is the power on a resis3r1 rj v68h827a,pcfwprs bcptor 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 r0)pl3 a,zg gta hoj.nko(9z;lespect 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 ca5+ v 7ikzk7z,;h/q/o 6ofhlz qur0qk crrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velo7v7qi hfzuk5k,lk qq zo/ z/6o;cr+0h city 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 bey l86h e+s1rkrcomes essentially zero at very low temperatures are referred to ayrr86 shk1l +es

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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?bty71gvk o-i0

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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 2.0 min. o( e;.4t9bdbmgbtr0y03rc nxWhat is the average cu30yc b. nd9 (g;0btrmb4rteoxrrent?

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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 for the current to be 0.55 fzq0fig,+8hs; l fetm y1wd+0 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 flowingta.9z h :z8vsr 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 10xg , q5x47fybh min. What is the net number of electrons that have passed thr xh f4gb,q5xy7ough 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 diuqu,f f cy8v qz7-8,xesired to deposit 40 mg of silver on a metal part fiuf z8uvcq, q7,x 8y-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 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 t/ wd) fi-e5tk7tlr8gayc8k b0hrough a resistanctdl)- ikf0r e /ca8wyg8t 7bk5e 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 currbav) b - y4f5dlke:0dxent 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.b. (8yidkn(*)hckzak8z tz 0j 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 c:bxyqpa2) :x resistancec::2q y xxpa)b?

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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.x)ek4a,xkei yc m+2l0w d,r a. How many electrons flow through the w2k w0x ad .myee)4a,rilc x+k,ire 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 of diamen 13 bi5abo uz.jg0r)vter 0.40 inch? (The resistivita u)3jbr0vi gbon5.z 1y of 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 resistan a5uygv+g /e)ofmv:+fyq+8c (5jrofece of a circular rod 1.0 cm in diameter and 45 m long, if the resistivity ivm+ )jr uo5eqy(gyoc + 5 f:v+gefaf8/s $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 (resistivvp4n/1n k7fkzwu 7s17 6etst7qhd0liity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 wi6l8ealy)0up ls 7 3c0asqamn/re (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 lone v0fx4j sq(6ig, measures 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 9;adt .yjoh e(2f.mcm (the radius is 0.321 mm) nic yce2am;j .(o9f. tmhdhrome wire 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-section, 1.0 /bikkeb zids yvu/s080yy1a;** 1gqmcm x 2.0 cm. What is the voltage drop along its length when it carrbys/gm1aqk0yd 8ik0 uz/* y*b1si;veies 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 j.h+pl(nmcvf6z1d c- tqg 6-d 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 wimi1b ig8(.iheu5rg a0re (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 a25)a9 -1)q qm/lnspcx9w.w aeyvv jvof $18 \Omega$ 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-:vh5rqljds2bzq p78vhh4z mv c 28d5(e urk0 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 d2exp yir1ha)x-ll55 xo0es8 tz *o hd*etermine the melting point of indium. The resistance of the platih)zd1oiph*0 lole5a 2y -xxt x*8res5num 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 throuze8rdvo b 2* t*ci lhw6*-qb(ugh 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 atoh9,ecvd0 3 hj 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 runniwndnh/99;3xf)pqo os+ ll xc 8ng 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 designed to be used in ,chu w8ft hfk*nnlo1030/ wysa 120-V cir3 f uhyotf/lwn,h8*c kws00n1cuit?

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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. Whaxf2 dtrfx4t6 - ma/cv6t is the resistance of its heating elemenff6t cr xmdv/64x 2a-tt?

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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 r0uj ,yp9 daub7v0v8wzy5 1jmrated 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 ej+mhhew :s a+ 5ywr+hl,s*1q 8+sqszat $1/4 \; \Omega$. 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 cuh1ot od.bi3 .urrent 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, whatnd,nm8 :w*xei-o mqita +iq 4cjhs n/l0 (j)-f 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 5mn /*wplue*vruns on 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 oii n4ts25ggf 7perate a 25-W soldering iron for 8.0 hours, if energy co5int4 gg 72sfists $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 )z afe97 na7eq100-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 connected to a 120-V line for 2.0 qg11x7wpab w8a0z0l uhours. How much heat energy is x1wbl aw10a 7u0zgq8 pproduced?

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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 batterbl):ie/um w+0g,xhjx ;b oc m-y store?b h lc,ioex)x;+ju-m/m: wb0g

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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.f81* oknwwx b80 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 per day. Assc9iij 8)l tnc5uming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the ati9 jnci 85l)cnnual 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 dg ibu0mzf (;8yr4e26sr p/f oxay. If electrico68;ir( zyf2gx0 /mrsufep4b ity costs 10 cents per kWh, how 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) electric bill included the cost of running a central aigj7r :8ycwh/vr-conditioning unit for 2.0 hr/day at 5000 W, and a series conhjvrg87:cyw /nection 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 operates on 240 V and generates heat , k7uziyy -z0rat the rate of 2.1 kW. The heating element shorts out and, in repairing it, the owner shortens the Nichrome wire by 10%. ( uy zy70izk,r-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 ta,q q7xbu9/ byhrough $8.0 \; \Omega$ 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 costshg6fmk:+ v 4rc jw)g,7.uvtrc $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. sti*zi/0v4x 6epm ; tqkg:f;dpn1qd) How much current does it draw from a;ntz;/:q 6 xd)d*igf 0 4pipekmtqvs1 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 flu 9 udrux)( 6,.2hfmr1yr2 h6wkdye sqows through thi mquke2r2xhufr1) rdd uy6 h,(wy96s .s 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 z cov s4ora011ac power source. What peak current flows through th4c1rz 0asvoo1is 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. Wha6+f ak2ck:hoay*3 sw ht is the peak voltagew26yh:a*+as co hkfk3 across 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. The maximuggp.zi*zy2rt n ci-,1m safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what i, -.rizc 2p igz*gnt1ys 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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