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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 transforminq+j 7rl)bnb/i g chemical energy into electrical energ) / qirl+jnb7by 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 throuo (gbxb 6w+ 3g1vl*g lru7g72jiexui)gh a wire's full cross section at any point per unitr(61gg)bwlb+x* l7i3 gox evu72jigu 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 current islubbj(ov pf0r(, bz2 7;dmn t/;r0cpu 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 hq(nt77r t; bfis 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 ozauqxva5 (2yno trj)84 g2+a in "amp-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 definedzj8j(.:v8 b afon7opv 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 iso4wqdx 9(ky,a wiig+8

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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 dependsafptsd jq+ i245/ l4xd 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 lowest resistivity valum(o 2yhw3-r6ntngo u,e?

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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 ( s(urell n-fn:vg:q;of the other. How do the resistivities ol:g-: ulqse;( (rnvf nf 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 dog p4 -if6oz:su the resistances of these two wires comp su:i6zg4ofp- are?

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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 has twice the cross-s6+yv6t,btncprd:f v. m/ 7hohysux g 9u 8m2f;ectional area of the other. How do the resistances of these two ucno6 xv62h ,dr8./+t :hmpgb f f9t y;vmsu7ywires 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-sectio9h rd*n4)eqk gnal area of the oth9k erh dqng)4*er. How 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 what zrdp9/ y)d)*(kxi i-dz ijh9ec. l 7uufactor does the resista k)zr-/dzx. pu7d9cyeliui *(id9h)jnce 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 rzz jd+q,7n -mwod have compared to a 2.0 cm diameter rod +7z-z qjm,wnd of the same length 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 comnd 3hod 3 tuw 3xd98iz(n/fjd)mon metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coeffic i.unl xd rp1rv743:vmients 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 tck1+7rbf,9eoa:e zdr o?

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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 equivalenth/l2i :rq3;4snqfu zy 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 doublesr( 3n arl jv,qdw qr3.vlg/+8d, the power dissipated by that cqj(rrv3dsqgr 38 nva. wl,/l+ircuit 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 resvvt t/ :11 f2flno-jehistance is doubled, the power dissipated by that circu2e-hfjtnl v1o f/ 1vt:it 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 fwtr x0p+g:cbnk;bg58y , )l lqlowing is doubled, the power dissipated by that circuit ;)t ,rckw+ bb85xn ylq0:pg lgwill

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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 conzsfr/f+ 4g)e18k vonvstant resistance is doubled, the power dissipated by 1e n/ roskvf)g8zf4 +vthat 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 out: r(mfumr+ /mq( )rufoput is reduced by 5.0%. By what percentage is the power on a +um/f : ro(mr(rqmu)fresistor 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:pf0nawm7p;g 6 alxu azkb7 l, h./p6z 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 currentqiu9g822qn o7,gu d usf1qa*g of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller ddsgi7 ,gq2ou*afq 89uu2 qg1n iameter 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 zeropbx wn ol7z,-- at very low temperatures-p ln w-b7xoz, 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 flowin((i sg3treq0*e/)b 7n bujultki8kp+ z6mk/ hg if 0.67 C of charge 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 in 2.0 m/ h-i00n qdkovin. What ish-0qv/kn od0i the 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 by a point in 10 s for r3b0-oaziqi ) 2 t q(*kpkrmw2the 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 flowavp2tse r9 da56 .xfvd 7bj2u(ing 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, whicg1d2.on sq0cvcs n p8 z+rk6j;h draws 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have passed th0j;8cs12sq6gz cdo npn kr+.vrough 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 deposit 40 mn6me km e4:h3lg 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? 6n 34ekl mhe:m(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 cause7sw/f ji8(87(rzis tfjvvg jaf4.k86wn 7nc o 4.00 A to flow through a resistance of 38vw(i n/7o ajr6z(f f8 84fscwi.sg n jkvjt7730 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 if54b* k2;jsb nlft s7ym.hbcg3 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 wilc9bd4 *mit dny u+p50ol 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.vw lcx x+w9gb: o2udy-l8 l97s40 A of current. What is its resistance? :gxlucow9vl8d27wb9-ys x+l

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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 resistt- emoqm)tt:16 h c3u o2l5sasor. How many electrons flow through the wire 36 m2tuso -:htasmce5 1 qt)olin
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 inch? (The resistivmtgn. owt2aqk,6yt0p8ei 9,9pa q i;vity of copp9ne pk 0omq8 yv 2t,q a9tag.;ipt6wi,er 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 owo6tw avuu32s6+ 5v mwf a circular rod 1.0 cm in diameter and 45 m long, if the rv twwoa26wum53 s6uv+esistivity 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 (resisvc sm8 iiq k*tma7+c4)tivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivith if69gq2w)pox 7 hx;1gy kl6bvhk 67ky $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 lojmcm *d+ di+n8ng, 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 is 0.32 u6r-8 -jmo;0n b pqrzld.abf)a;0 kox vfl3,r1 mm) nichrom 3k a-u 0vf;q8p dr;.nmlbrjzrboa6-)l,xo0 fe 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 rectan q puuq )6g0fpk2abkr,w+zxvih),d, +gular cross-section, 1.0 cm x 2.0 cm. What is the v h,u ) p+v fr6wpq)aq0d ugkzbx2+,i,koltage drop along 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 0.5j,i,iq4 sfo5+u3d omvfn f-n+0 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 codj , moz85uvr:*hc u:bpper 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 of 0qlkr(+e uyb1 7k /asb$18 \Omega$ 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 platinum is - cjlej)-zj. :ch9ydh $3.9 \times 10^{-3} /^{\circ}C$. 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 poiifo35 5zg.nz1uskru 5)k8 mipnt of indium. The resistance of the pz13)nf5pr8s ukmzo u5ig .i5klatinum 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 th9b)r kj5lgn9j8gah porz2c23 rough 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. What current wr9m di;3 twzf50(y4(abtm ul kill 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 h82 h6rwspxi3 tow 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 resistan ypdmqgjnz*m4.ss(33n)u b 4bce of a 100-W light bulb designed to be used in a 120-V .dy nmb4g3 zj4psums bq3( n)*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 1aw)7 hqc kmd1 ;/zsu6jvmp(; pfho.yis the resistance of its heating elemen1a (/oy h1.6pmw 7kdcjf;vsqzu hpm;)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 md*z,dghg;lw3 -vtor 6gwuh (62u2ed 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 ratc, i8fmz3s0 awzo;r 5ued 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+o (r)z nw4rk/gi /ralf8 -hvz 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 useum0jqc k*u, 3v+dnm7y d 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 ak*/cnud03ce2pf jv3 h mc12b110 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 ec *w9jnc*)onynergy costsjny occ n9)w** $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/n/ 5+k lgpzzw 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 hours. How much hen6aqy u.*if jubo06bmk;w s,)at energy is puu)q,bj.0 bmnf kws;ay 66o*i roduced?

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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+ n9+-iwglk )1cat bcl battery store?1 +gcblc9+kn )- atliw

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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.;jc9c6yx pt)xxp( b6m: hl;le0 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 i8 9sn4(ab(ltyc,uaf hs on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to opey4lau(,t fn89sah c( brate 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, b*gxpgspsa9sp t+wu m-7+l 1.0 hours per day. If electricity costs 10 cents per kWh, hs*abpxg+ s-9,lmstpp7 w1ug+ow 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 c1u )uk 6v6wjq (c39rjl3a tl, cbdgt.tentral air-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 contribu.wk)cj6 jcl( t3t q 9bdl 6r,3tag1uuvte 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 generyetx ced-- 9qy2 u+0gc wfk3m94rthm: ates 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+c wfk 390emcqy-u r2 t:4 d9gthe-xmy 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 throughry4qrgl +9se8 $8.0 \; \Omega$ 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 costsmi +j5mi qen2h;qr gha ,2lrum55dh :7 $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%84ke rfyy,excoi0gj p2. nf5( efficiency. How much current does it draw from ( okg 4f .npy2ce,jei8xf05r ya 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 isxfmi+4t nd . wn/73othrough thsonf x t diwi.3nm47/+is 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 conn1kk16 kwkr+3h zu0 ldvected to a 120-V ac power source. What peak current flows through thi khk+vdk3 z06 k1u1lwrs 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 connfnnfp.4j i5) u7+t:t kd joye1ected to a 120-V ac power source. What is the peak voltage across this devicodp uti1: n4.e57kyjn j+tff) 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;vp. 1rwjehr5ws)9ig z2ng) l 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 number of electron ca.izsrh)g;1grw w )pv5 nj2 el9rriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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