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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 ng 8btu(lg94xgi; e-rtransforming chemical energy into electrical energy igxn8;(l gu gr9- t4ebis 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 w86,+z lyniqr through a wire's full cross section at any poqi+r8,z 6ylwnint per 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 convention current is takeh2 ij badm 2/g6lw)oh(y(f c8en 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 s-w llru. 30+fl ;zwwigame 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 i2ke:mb;2 kwo us 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 defledn;wki u2r2+52 jet ( tkd5qined 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 wv1pza6icd+e*8 m) cioire 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 depuos;*)v c.vpf1 zw0p xends 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 vav3:ywm,ik 6bvb-a+5 0w varce lue?

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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. w:*; z ku-x-zyeoaxh;How do the resistivities of these tw*a zwxu;xe:kzoy-;h- o 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 lencp5t1b ;*zz3qpo6kdl3y gn s0gth of the other. How do the re qgyz*b;zp35l0dpo 36 kc tsn1sistances 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-sectional area of tpyid v1k;a wf6x-j6f 1he other. How do the resistances of t v-fxy1iwaj6kpf;d16 hese 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 twicesmdypq. .-kio1z 5 q;x the length and twice the cross-sectional area of the other. How do the resistances of these two wires coq id;q1zko.smyp- .x5mpare?

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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 wirejis-/(o h9mh m is doubled and the radius is doubled. By what factor does the resistance change?-i( moshh/j9 m

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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 havfz.u 79rjaj/ lvzan6 1e compared to a 2.0 cm diameter rod of t9z. uaz/ lvrf1a jjn76he 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 ))j6: xc8 llkne:vhjr 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 4+ bb3o; : ch qbnus;5i2cirmxresistivity

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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 equivalentv /hw37dg4u wk 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 equivae 5p9o n2lwo4q8hce6olent 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 vo 75clvs9s 96u*zp:zlz v 11cmjj:ilso ltage circuit is doubled, the power dissipatedp 1vuvssszcjc6j5l *liz o:z91 :7m9l by that circuit 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 resist,t lmss+rz2-d .xow;5z j .mptance is doubled, the power dissipated by tham .sz;sd2wm5-ptz + x,t.jlort 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 current flowing is doubled, the pow ne:ew h:9p4yd n;d1-z lq1qeqer dissipated by that circuit ;w-nd qe:dyh: elq411qze9 p nwill

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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 resist k*a et,ubp2otp;otk-0xq 84. ,or etzance is doubled, the power dissipated by th ;4z ,xk.eto8t 2 a-pp0,*t eqrubkootat 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%*m( f9(kdp t3a y54cxn fozwe;. By what percentage is the power on a resistor affected?c*z d3(mp4f9;t nyfe a( wkox5

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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 sinusoihqu0 u 7edavz+d3h+;*y4adv5miqn i9dal with 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 currend 9 bbbb2i3iv vxrwm ll-7u;83t of 3.0 A. One wire has twice the diameter i792r-mull3b bb8idx3 v;bvw of the other. The ratio of 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 thb44c8s;)i8ukaxssb n 1:qpt c e resistivity becomes essentially zero at very low temperatures are referred aq4:scpi )1u 4sbn8b xt; k8scto 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 flowi;vprke.8 - gljng 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 inuwh+ er7 s2g:n 2.0 min. What is tngh7:uwe2rs + he 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 the current to be 0.50 uy3q/ yq x*xw4A?

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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 flowil5(y tm, epfo.ng 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 ci(mdq8ocnlht9 .8 jj ;-cbc-uurrent, has been left on for 10 min. What is tj(ql;. -8cujon 8c9ihc t-bmdhe net number 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 desired to yd vvegq*ia-)pn h+o63ff/2l deposit 40 mg of silver on a metal part by using a current of 2.0 A. How lo +ofi)*yg2h/ qpavf-ve3dl n6ng 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 thcy *bvomsl8 *m0*nyu 17oxlir.5l+ is required to cause 4.00 A to flow through a resistance of 33b rm+ol18co7xts*u0 i.l*ly my hn5*v0 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 reslm:tsu, rk 5+zistor if the current through it is 5.0 A?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 flo6n/ ,1f3cq(zwbcdep lw?

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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 V5hbn-++ w q:xg cxa)vzu rj*v*e1u jx0 draws 1.40 A of current. What is its resistance?-xjuv x *+qewnra+150 g:jcz * vbh)xu

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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 connetrz bk/w * m*a,00v;sgsaz(uycted to a 100-W resistor. How many electrons flow through the s*t wzu0m (s avargy,zk/0;*b 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 wire of d;(1 p59xkjknp-tjd)v ev i6vrx s9qt)iameter 0.40 inch? (The resistivity ox(eijq x ; 5)69psj p1rk-v)d9vttn vkf 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 cjio+wlx znh- 2sp,ueg9y-g4emmbkn4/ml23- ircular rod 1.0 cm in diameter and 45 m long, if the resistivity4sh -2lpx 92/lmu-ji gwmen3 -gzy o n,me4k+b 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 wir1+u0q:ezq b0idx ug9 ue (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 (resistiv k8aoufcd0g2)y(y18u ) hvnz,xlpq+nity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 mhz5bx4tgj6 1l8qz 6qe long, 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 /9cw1 zhklaw8-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity of nichrom wh 9z1/wkcla8e 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-sectilg3 b-khr nr4r: qaz-5on, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of copper ir-5 zl3bg4rqanr-h:k s $1.68 \times 10^{-8} \Omega \cdot m$)

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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 nichromevl3 oq 2b.m0me4jpb, a wire has 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 cob hjh2 1rys,u7rk n17apper 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 .agto60 dnd:m92kl wum usp0 h)686mx g rls0qresistance 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 resistivitn+ 1+3;b:q ruk idrylmk+est( y 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 inpda4cnqhr-r0 5 w5a5y dium. The resistance of the platinuphaw4r 05yrna-d55cqm 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(sbao h ;*fbw1 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 curre wa:7f 5iq aentnvjek2)g5j ,*nt 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 mucfx wcigez (q:p(;7 c3-vy9qwxh 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 d-wu2 sm-ww6e(wa.t5jdded ul6:pg7 cesigned to be used in a 120-V circuwl -add7u 5c6(6 -w w :ge2udpsejt.wmit?

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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 resistanceo a488qbtjo/0cnxk0n of its heating elementj0an kx/cb08n 48tqo o?

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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 apk l cu-;ru6knam,zg+*jr+ /xvlmxpue62: .jt $1/4 \; \Omega$. 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 oc md ecaa3 8j*8kj2j.rated 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 is used a cytu::q1l e5yt 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 resistaxv/u77q-z9 ref 8 jxivnce?

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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 onfq( wa:: hb0 edkhnc7( 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 operate a 25-W soldering iron for 8.0 hour3twb jxnryh2 m;fbcu-3u 2(-j s, if energy costs 2mjfw-;(t 3 nb2yjrc -uhu bx3$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 noqvue;0s 43uu 3ou4fhw+ 4xn;q. npx100-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 connectedz9ozh/d)5v d b to a 120-V line for 2.0 hours. How much heat energy is prd d bz59v)/ohzoduced?

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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 1xyog+fb r9v/* 2 V and 160 A-h. How much energy does the battery store?fb yg* r+vx9o/

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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 solderiym-nde9*hb3cw4vy :dg 5i gb bew,-; lng 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. Assum. ms *fmo, emv(7fs9scing the power company charges 10 cents for each kilowatt-hour of elect.fev9mss7fm*s ,m o(c ricity 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 p/3nkb 63 /ofuf . :qdqhioq(uhlus monitor) is turned on 8.0 hours per day. If electricity c:hk6n u/d/qi uo.f (33boqfhqosts 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 ceu/c;hd/ ke.3 adscd7 antral 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 cost s /hd k;/.aea3ddcuc7s 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 drijtrzd/ g7- t-ber operates 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 the tg bdt7/-rj -zpower 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 y7p9 qi;9j s lh+:jszlthrough $8.0 \; \Omega$ 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 0y + itkesgr7 4 :vzv3ekd;7ydwy qt,0$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% ef/,k*m( myiis 7f y7ejmficiency. How much current does it draw i7,e *mkmi/(yfyjm7 sfrom 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 source. What rms current floqyndn0x6c.0sh,vt i r( q32yyws through this dq(yni 32,. cr6 0xhqty vsnyd0evice?

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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-Vv uo3*bfwfr 3 gf)2 ihd9v.hbnp2u+i( ac power source. What peak current flows through this devif w (unfhob f2g)vid buhv 3*r3+pi.29ce?

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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-a,c3vrouy *s;vl h43cV ac power source. What is the peak voltage across this hv vr*o3s,3;4ccly au 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 max(.cn 3dah* q/ b 22dbw9vr0mdsg. w+yjywqnn-imum 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 carriers in one cubic centimeter of coppedd(.wb 0b*+hgrw yv-3/nq.9mn 2c y nwjdqas 2r is $8.5 \times 10^{22}$.)

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