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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://autodiscover.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://autodiscover.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 chemicall) vz5q;z+j7 oqfo 7cv;ti e7g energy into electricazl qo+;i ;vt75)zgj ecfo7qv7 l 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 sectiondu5o (3 a phs0pfiv2i3 at any point per unit of time is referred 3iasfv0i 2pph d35 uo(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 to be2 swz(+ lkcxq8 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 sam9 6v9t4p+ lam9(3l lri xrtsdse 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 "ampnjw sk bn)83jr6 0z2;erplym 4-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 wire is defined-f uc0dx1za:isw rqz cz) g./+ 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 w5s q;o/dry o/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 dezi 19a juc04ie4 irz83nvf8su pends 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 -g-axt83 1na8fbgnm4hw u1 tc 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 the other. Ho:bj w p(1ana;;7cbxzq w do the re(qn; wb:xzaab jp;c71sistivities 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 len hnr/uo:2 oftr2gb2+lgth of the other. How do the resistances of these two rn o2u +f2b:r2toh lg/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. rv n1 zb8/v:wlOne has twice the cross-sectional area of the other. How d vz8wn:l1v rb/o 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 wil3kld7v uic.5res. One has twice the length and twice the cross-sectional area of the other. Howiukl7cd 35l.v 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 doubled and the radius is doubled. By (*htw,6jd +ryqstledo w934 jwhat factor does w3+6y(dr9dl4hetq*sj j t , owthe 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 cm diameter rod have compared tk.yfq :mkgk66 o a 2.0 cm diameter rod of the same length and madek:q.6kyf mk6 g 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 co,n zliw:6 r jo7dfn6//xk w5w(gbfm; ymmon 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 zd6h)l 9 0gaoxz-0gks 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?p ix9( 1wle f.q7y9gpv/fqzu3

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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 equi.7e+z/v:2uk n3 b vjrb bd3imgvalent 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 po7n euq7- ;osp0x -vaxywer dissipated by that circ; su-e70-qxn yopxav7 uit 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 8;kc o/z0qb-*k5fpa; o aavbqis doubled, the power dissipated byfo*b5 - qazka ;okb/qpc0;v8 a 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 curre. c3 thj k)5p uiwtvmeae80q)uk/-8sjbuo h4+nt flowing is doubled, the power dissipated by tha h35j8u4j0akb uw ti.-eh o m s/tvpe)c)8+qukt 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 thncq6+9nq3 8 vptg/(zn;xcrw*qbex p:rough a circuit of constant resistance is doubled, the powen6 :cn* vqng9qb/w p8 +3;pxqzr(e xtcr dissipated 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%. By wha4j6wgw l1ioqj i y16t6t percentage is the power on a r46yi i6wo1t wg1jl6q jesistor 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 wiv4j83xo qyj4 rm ide2b6- *sqwth 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 3.0 A. One wv(vdzw 5u3 il;ire has twice the diameter of the other. The ratio of the drift velocity in the sd vil(;z5vuw3maller 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 resistivhy, cf(:bfyd8 c1n, sxity becomes essentially zero at very low temperatury 8,f,cb1sh yn:cx(f des are referred 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 point inp9ei r2 e-k)eh b .ph;-ynenr(2vog y- 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 througk 6mp7dxzc8w*e:9q/3 rf .weigtb zh.h an electroplating apparatus in 2.0 min. What is the average curre3px8cr *fb:7 e./gitw h .qzwd69zmk ent?

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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: 8:/g,nny lytno 3:ip ur8b,yg)awhlke(jj 1 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 flow4sb8x5 m*vhsye dnx;:(( bwjf73b wkhing 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 curkec64 z ep4br4rent, has been left on for 10 min. What is the net number of electrons that have passed through the coffee makerpb4 4 6ere4zck?

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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 desirei(m t2g )8m* uqtso4fa)i*pxvd 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 x8 uag)t *q2)*mitpi( m 4osvfrun 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 through a r 4sbk9*wr z82vopa tx n8:jly(esistancxb*l at8vpo s4k(29jy zw8r:ne 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 resd hbof*v ftuq483u6w;:z xsz/f0md8i istor 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.ldbcu8bvm:vwzh; mp+ 6)4(dh 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 i0d* ihbya1 r1.npfyxf 7+,oi 110 V draws 1.40 A of current. What is its resistance?y+iri 1xo10andhif*7p. byf ,

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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 thfnh9qu, pw4*atf hpm 68e4 m3mkeag.h/s;1odrougqf w3o4mtd8a9sk/h6*e e uhf g .4a,hpm;npm1h 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 resistance of 1.0 m copper wir4b.8j7kqqr a re of diameter 0.40 inch? (The resistivity . rjr7bkaqq48of 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 x au6 o 4a4:it43t3u/rskktzo45 m long, if the resistivity u/ t 3ti:4t okar ouxk64z4a3sis $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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,k99 n nt8nfzqtivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (rez9w k-lfszrsa3a+hw 720jds. sistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 lgk 5bo v3mr2a-ong, 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 (the radius isuniu+3 zvz)k * 0.321 mm) nichrome wire if it is connected to a 12.0-V*+ik) vnu3u zz 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-seb2-9bq/rbju*d .unl5 kaldh(t aw (* wction, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of coppbl d a/qj l n**u.2-buadbwwh 5r((kt9er 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 0.50 mm and a resistivity /sij5y54 r (2gj xuoj-a jf7vvof $100 \times 10^{-8} \; \Omega \cdot m$. 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 (: sotddvy2+j 0resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 of w7a77 0p6gkz6fbptoq qf e5 6x$18 \Omega$ 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 o f8dq5)j0 gjn4ny6 hog,hb5quf 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 tgfc.vw//fk7w hb 7euf0* /zvche melting point of indium. The resistancec7fvf 7/wk.e ugvw/0*z/ bhcf of the platinum 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 through vjx )9/s br7v ke/sk04b ajh rm-g;4htan $10.0 \; \Omega$ 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 ssxz+rq ;q2v) 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 running on 110 V draws 0h xw449 l/rgioeipdj2q .-gk9 cru)ihow 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 resistan6efuqxjfque4vz gyno 3 2 x:sdk) :995ce of a 100-W light bulb designed to be used in a 120-V circuiz 9ynxu sfk)::359fd 6vee u2ogjqx 4qt?

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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 it,)a jgmh k 05s;ux6utms heating element?0,ug) kmsx6; ah5jtmu

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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 raib/jlj ))r2 pv(y-fj eted 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 ayd:+ 1k z nu 5 jnyz.ptgom6zwaj93ia* ,w)u;jt $1/4 \; \Omega$. 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 does w -yc je7vm/yg.8ej5sit 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.kq50y0+c mgjt 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 on 110 V. What is its resistanciid+ hf(f 6l.pe?

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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 ene/5awey 8stl 1c 7o1zxrrgy costs5c o17a lsrxze/1wyt8 $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 uk.qmzit: ,b/ tse 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 mugv6 v vg) -fm/t1(h 9bx8iwzeich heat energy is produ-i zv8fvv (e9)ixw6hgg1t/mb 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 ag 4 ivw). sga)8s;sn*gjbum e2t 12 V and 160 A-h. How much energy does the battery store?; sgnweguj8)i4*2 gsvsa).m b

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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 cak+qq :4.j tphj4e-siron 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 hours8w3:pduho 7fz5pm1 .xmwi;nw per day. Assuming the power company charges p.h8wwu; 1nmp3if7om5z :wdx 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 (computer plus monitor) t5+fat:3s jxq5i(en r is turned on 8.0 hours per day. If electricity costs 10 cents pere 5sxij3t( q:naf+rt5 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 centr.kx(m o: mno,*1lobp*ucao( gv f+c+jv: suq*al air-conditioning unpgqnv:so u +:m(( u., o*bko1jm+o l*x*cfcvait 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 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 2v5jt 0vxo0f;;wltt 3cbh j 2q+40 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 1b+ ft0qtcxw;hl 5jtv o ;3v02j0%. (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 throues djf)rg5 /n-z47zsjgh $8.0 \; \Omega$ 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)vp1qdwj 7 g a2g-,hbc $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 oiy/ifu3dw:t (f 2.0 hp has 60% efficiency. How much current d wf /y:t(u3iidoes 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 connected to a 120-V ac power so irfv- ko(cix3pf)8* wfz(e 9ource. What rms current flows pzi) ofwxvre8-fi(3k( f* o9cthrough 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 y3 8v6 cqt8+ q,hoju1l luqxlhj1we1)to a 120-V ac power source. What peak current flows through this device?h1v8,1j l+6q1c l)j3eoyqxtu8lqu wh

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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. Whatwdu3ji.02 yr l+cis 3u is the peak voltage ac+ jlciirydsw.3 2u3u0ross 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 maximum safe current/tq 0 g(7yu4vy h/w1c ifj-nev 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?vfgj7 y (/4yh -iewqt0/ 1vnuc (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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