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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 elx jx*;(o yh6j8y t5soaectricity by transforming chemical energy into electrical enerho;ts6 j xy8a5xjyo*( gy 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 throudz -zaxl0v6 ;n6zf2hcgh a wire's full cross section at any point per unzczl26 ;xndh 6 -0vfzait 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 is taken to be the direction thatd2q*a7); -sme eclkl(1f jzaf

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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 nk j9oc8m; ;v+rahvc.dyd34m 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 ink27w u.lbdm4k "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 defined (sp5 d9otm97k8ovqz w 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 wir6 cki2;up4wxb e 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:/mj g1m6lan ,ab cob-ko7py(ends 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 resistivi klpp6rc5 9r/,7o pzu..xxtjtty 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 v01 3 gaowrib7of the other. How do the resistivities of these two wires compar aoi3 wgb1rv07e?

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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 tc,my*et k(6pi )qhdk-c*wvs 8wice the length of the other. How do the r hycm e(tkqd*8cp6*)v wk-si,esistances 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. One has twice the cross-sr. duqou49.( .a -tz8 opap*aqqgrzc -ectional area of the other. How do the resistances of these twoudq( pt.ro.z. 8a-ca qu ogq- pr*a9z4 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. i.amm9a*r +g zdj zm2-One has twice the length and twice the cross-sectional area of the other. How do the resistances of the2+m-a zj9rmg.a*zdi mse 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 doublds *,hz3apl0p u khkrp05 x3(led and the radius is doubled. By what factor does the resistance chang xa 3phslkd*0,r0u3zkph(l5 p e?

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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 to a+zpchp a 0awg+3,x 7ch 2.0 cm diameter rod of the sama h+7+ ,0pchpawx g3cze 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 l v /qy7vm;xf(common 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 of resisti52xf hibm11ypv 4.vc5tkmow 9vity

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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 equivalentledqe22( zoy/y:sj3j 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 equm7cz b3 701jh xz.l-ukvho6 glivalent 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 cj5mde;gli9 2tr p)m ch8 03fbrs;e a.qonstant voltage circuit is doubled, the power dissipated by that cr iesg0mbrc9 e8.pdq mj)ht;52 f3l a;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 resistance ismqal 5m( hnw5,j3y 8dn doubled, the power dissipaten ,3hmanlmjw 8(y 5dq5d 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 c3 l ardyv-*en:ircuit with constant current flowing is doubled, the powel -ved3a n*yr:r dissipated 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, theb1m *09rlrpxnwt4jn9 y0vr*h power dissipated by that circuit 9vp*h mrr1btr* 9xnlj0 0w n4ywill

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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%. Byh,4/.) w;dortc+gxo ja0a gbb what percentage is the power ox/d orac, bo) gt.aj04gb; hw+n a resistor 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 respe p .aie:f;a3rxct 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.m8e5b oz l+a-n One wire has twice the diameter of the other. The ratio ezl58m+ oa-b nof the drift 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 the resistivity becomes essentially zero at very low ho8bau s9)s) itemperatures are shsui a9b) o)8referred 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 iq ut; 7-zzdu/ldn)w 0cf 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 ap z0j5bq h.tzq- 5n lssy:9pj:oparatus in 2.0 min. What is the aveyt-sj5qoz::5 .q9jl hpn0sbzrage 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 the current to be 0.53gsvyb*qgx 2 ;3je fi +qn*wx40 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 flowr4kzm o6.8 gc-2zdityu g6ut9 4uppo4ing 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 xog8*c:) df vlcurrent, has been left on for 10 min. What is the net number:f8 v*) xlogcd 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 ded s ;pypadqjg xgl2 4*u/v:d2zt4y. i)sired 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 atomic4lg2ju/ay)pd* 4v;d sz.gty q2:ixpd 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 8d)yp/aw9h gq1s dw v5required to cause 4.00 A to flow through a resistance ogy5qa1d )p9vw/8wsdh f 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 y+i.st: mj(ozh0b2u xcurrent 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 will 7 ,fk/-xf- u8vmfsq qdflow?

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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 resistanl g la(b0.-muwce?wl0-.b mgl(u a

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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-dwke/ik q tec*,ygdq8y 2b 51nm+ lm, electrons flow through the wire iw8qn2kedimc, ,5b/dyl1mqt*y+g-ke n
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 resisceabkaj ; uyhf)*ys6.08odc9 tivity of copp8oc h0 y*kecy9a.s da6fu;b) jer 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 45 m lo2lhb-tmtfl )5ng, if the rest5f - mt2h)llbistivity 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 copperb lctwo23r;gnpki*3 (9dp 0mv wire (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (refu c(:ph,uz2fhcozg,c y- b+4sistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 0.04k.f9e)x. /sj.c abgc g0 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 +nr6ddvpr ms))3a 8kt8zq(ymthrough a 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivy3np8q)mz(vtdsa mk6 )d rr8+ ity 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.q. xl o0ufij-p7 nu1a*0 cm x 2.0 cm. What is the voltage drop along its length when itu1i7juoqp.x l0- *nfa 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 0.50 mm,if0h*p phe)iu5 a rh85w5gmm 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 (resistivix6prm 2 oqp q62b (p,0uy-nkfity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 av/o56s dpmuiryk/e ;1h;ap6 d resistance 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 coefficient of resistivity of platinum is llfcwt er(i j:3g1dw. no9 1,v$3.9 \times 10^{-3} /^{\circ}C$. 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 meltinql88kz pwl21u g point of indium. The resistance of the plati2upwq88llk1z num 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 throu)kb5zpu+ki o,gh 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 curr b65e37fkkb wesoh zk; *40zament 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 c zc:bl+ den ;-eue+s,ckej k+1urrent?

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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 designe09zcf u i3xz5;rpy-prd to be used in a 120-V circuit cip-;uxzp3frr 05z9y ?

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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. Whg qyk;r ;f7pj9at is the resistance of its heating elementjy fg;;7p 9krq?

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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 r 5eqyjvapteo1 nik00 l:1 :z3rated 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 ratedlk6x 3cy zh 1p0g3xko4 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 .5o.vr/hdc a tis 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 *zl( ,smejnu3it 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 resistapd.s:f;7ln+ p z+; goo /euempnce?

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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 8kd 03an/87u vklc;z zd.0 hours, if energy cocazld3 0kzk7uv /dn ;8sts $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 use in 8.0 hours? h6knq6 *(om9nrkcr:q

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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 vy*-a c8lot ihl/m-yv/a n7o 1to a 120-V line for 2.0 hours. How much heat energy isoi/ vynllhc-aotv-a17 /m y*8 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 12 V and 160 A-h. How much energy does ;(bf.;3kevnd iav) zuthe battery store? bzi;e)f av;.undk3v(

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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 solderi vyhphmhu3(f:;dn(eh 67 dvh :ng 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 bulb is on 10 hours per day. Assufzd +hn 2l822 ;wdvcwhming the power company charges 10 cents for each kilowatt-houwd8vlh nw2 +2f c;h2zdr 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) is turnedw6n+t y+,wwuy on 8.0 hours per day. If electri ywuy,6wt n+w+city 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 include0aj ; )ro79c5ateztqnd 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 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 cen7tzr;9nc j)aqe5 at0ots 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 atu k2elxa us8u :ozeo8x:) )ue- 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 power:)-o l2soeku8zxx:) ueuae8 u 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 througw8pm r6dl+s s8 )ctya;h $8.0 \; \Omega$ 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 costswhx r0sk () cci(ym9u9tqum: - $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 th+cr6 2 xz, 9tl7n)hnzp c:z;; nngkhqye rate of 2.0 hp has 60% efficiency. How much current does it draw from a 12cn6q7g n; n ):+ kzyx c;lpnhht9z2r,z0-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.i9aoc5tj am6:0 2wute What rms current flows through th0i e9a ot6:w2cuat5m jis 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 connepr3b c jc/a* w7 ylp:4kkfd3n6xx7 :lected to a 120-V ac power source. What peak current flows th: yenkr:xl3 fpw36p 7/jca *47dc lxkbrough this 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. f ehgalp66sny2a8rf57-i e g :What is the peak voltage across this devnia ep-6f7syh r5laefgg6 :82ice?

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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 i6-zl1 imb5 ofx,l1xwdt can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is1xx1wf-5 lm,i dboz l6 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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