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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://5edu.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://5edu.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: admin  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 chemical energy into 6u. qvsux03ckwn89 hoelectrical enerk.03x6cqn u9h sowuv 8gy 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 )xsk w4m1nz(dthrough a wire's full cross section at any point per unit of time is referred to askw 1 ndsz4mx()

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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 currtrna:q3q- )il1r x 3rhent 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 i qhlcuuwtpwq/76m,3 j8bz 8j+s 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 in "amp- u,elg1b9aqaq+tb5yp /e0e, u 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 iggd hio mzbaw/8xe*e8o .i(,2wok +9 fs defined 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 wi:gt ud/: sny/nre 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 depends. nk uj6ks5f 2zw3:loe 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 hasnue7n-v(pt)fky 5 tb, the 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 lengyz2ii tjb 1y-oqj2 .h6a ir)8eth of the other. How do the resistivities of these two w8bz6ejiya.1t)i2y-2 rh oqj i ires 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 6uet+ mmit7 ;6uo.kgz3l5ukgof the other. How do the resistances of these two wires com.k6u7;lkt6 uzg +5gu t3i emompare?

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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 cro 89*yi6iray agss-sectional area of the other. How do the resistances of the6y i9a*gy ira8se 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 twice the( ,whw+akla ;i cross-sectional area of the othehik,awla(;w +r. 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 whyp-7 ki ubo6a.at factor does the resistb- py 7kia6.uoance 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 hav*)d3w8nyhj2xkn70 j lsemf u( 0wqg(ae compared to a 2.0 cm diameter rod of the same length and made of the same ma gh3s 2kw8 nlm)(u*j7 e 0dayfqjn0w(xterial?

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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 commjzj .teutgnq .xz,p8m:dl- ( 3on 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 resistivity-kb ;wybggfsaey9 )0.

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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 tazo) 8jf6 ;paeo?

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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 epf bvw0n lcir0a0a6)7quivalent 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 doqra ka qil k6zwspp 9d;8xt.sw3r.ok 8u*3,z4ubled, the power dissipated by that circuit willqqkupwk.4*t,oir6 8k3z xazs8w .r9a 3p;dls

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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 constantn hbitg79,p/d vs;l i9 resistance is doubled, the power dissilgdi vtp/hi99;s7b n ,pated 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 circuit with constant current flowing is doublzlxbv ou42 5l:ed, the power dissipated by that circul x 2zb4uo5:lvit 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 resateqf9y t )h-ro)st 2)*p 2nkfistance is doubled, the power dissipated by thatrhyks9-tfn2tof*)ap e q2))t 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 what pextl gtw *-etif 6).g-vrcentage is the power ontxi e-t6t w.-gl f*)gv 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 wi,npl*ualb5aw53e 0 0oma4 wfp th 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 wire has twi8zkuojr- n ),bce the diameter 8 j)-k, oznbruof 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 the resistivity becomes essentially zero at very low jvqvoqj:di 69b 9p4s*temperatures are referred to asq6so:4qi*99v bpjvdj

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current is flowirwsmwp1xqxww1 /2 .3uvh/ ck/ng 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 s,mt 4o, (a4b0(gvozi7qqnx;sp b u0 ythrough an electroplating apparatus in 2.0 min. What is the averaz 0 ivyoq4;bqus (a4bxn,7g(s 0ptom,ge 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 0.50ch:t 0pg0esl p;sv( n9+ brod6 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 flowing if -h;edl0i i6s,-eh csd $4.0 \times 10^{16} \; electrons$ 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 7g r0gck3i dg7A of current, has been left on for 10 min. What is the net number of electrons that have pas7 i3 crkg0dgg7sed 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 pr :)2lyde:,:qp u o.dqmow z4lcocess, it is desired to deposit 40 mg of silver on a metal part by using a current of 2.0 A. How long must the current be allowod,lqc.odey: :4 l :2)umpqzw ed 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 dq4geuw7vf3e,w, m:n to flow through a resistance of 330 We 3w7d: ,eumwqvf4,g n?

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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 current through it i,gg 4 j14oxeays 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 connectelou1 )uys*ck,+hvw l8a7l qf0 d across 220 V. 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 ; 9 w v-cdt)ohtvw2jl/is its resistance9 c-lj;2wwvdh )o/tvt ?

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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 conneb yjp. xn9a 6ge89m0khcted to a 100-W resistor. How many electrons flow through the wire 96kxbapejngm8y 9.h0 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 qg:a1ic0qr9 f wire of diameter 0.40 inch? (The resistivity agqrc: 19qi0f 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 resistance of a circular rod 1.0 cm in diameter0*.x erm5li zaios/w ( ug8aq) and 45 m long, if the resistivitu*ii)mesrw5(la 0./q8a zg oxy 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 ( o nrzx.o(dy*,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 (re bzwq00 8rcjp 9rz/(iqa n72gbsistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 longpn :al0m ,c jk7wk;gqec.o.y,, 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 0.321 mm) as5q fb8 )5dr 0(s0hhl+sgo pjnichrome wire if it is connected to a j0hogf 5+)hsb r8 0(slqadp 5s12.0-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 cf, ylwxm78h,ge x4d8 re mx58long and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its le7m ex,,88cfd48xey hg 5rmxwlngth 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 0.50 mm and a resissmvh1(0 9i rfitivity 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 (resistivith08hu* tzn1kg8 n2;o vhognn8y $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 res9fhb x06-;ns 5 kt/3ujxsq( t n+sdslyistance 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 coefficsnr- )z r-y8xyient of resistivity 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 wsi,dg(k d;9w of indium. The resistance of the pld,9dwi gkw;s( atinum 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 b8o.a: zqe8frfm,w(b d;+fs m 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 will it dra,b0k;at 5hp *ann6 gubi,;md rw?

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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 runnz v-va0xy* *xsmss) x-ing 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 bul ;k.apev.(bp jb designed to be used in a 120-V .p ep vb.jak(;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 is the resistance of its heating1 64n; lipae k7ou9m*:ppp omh elemenploe6u7 a9:po pm1 hm*4npk;it?

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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 aq-p7xj j gh,.rated 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 ra4.n*o z0yuhl dted 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 bud- r (gv0zr zmxbu.68tlb. If it 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 used at-nqvv7 a(0 bit 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 ,t9z733ipf 4vi-el jx pkvam9is 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 ironyud +ll/w1d 4b for 8.0 hours, if energy coulydw41 b +l/dsts $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 uj(wl7cch .b c e8..9wet y(fhin 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 connecteo/ajcfp f15amj /1(z fd to a 120-V line for 2.0 hours. How much heat energy is producfpfa o 1zc/1j m5f/a(jed?

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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 doesihy +q1pq) y3v the battery store?i31q yqyp +hv)

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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 sold8+ z*(q lswi tcusi8;jb4h3 zgering 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 cxml6z , x,th8;sbu2cis on 10 hours per day. Assuming the power company charges 10 cen,cxtx2,b ;usm 68c hlzts 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) is turned on 8.0(e)a0ms4 wp;fv4 z 0h(xpxl ja hours per day. If electricity costs 10 cents per kWh, how muczxjhwmpap)(f (l0 4e x;4sav0h 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 yxv9) hz6p o*th8fisx-v2js *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 billi 2)sphs zjt-vfx*xo 8yh6*v9 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 ell-i kor 0 4qw92n,2 y :qqjzvik9isqf*ectric drier 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%. lw*qqki f:224n9z 9yovi0qikj q,r s - (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 through ;f-x)+l5xj0d ocmt w q$8.0 \; \Omega$ 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 t fbiy9dnp6:y8x, 5na $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 2 cu39. y u tlcu;ybngi2yr4d)r9lf y9hp has 60% efficiency. How much current does it draw from 9yg2294dr nl9lu3it b .ufyc ruycy);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 poweo;r(wq,1h thgj7y 4sxr source. What rms current flows through this devi7os 4 tw (1;yrgx,qjhhce?

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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-Vqhpzc88 mqde h;yr2r tl:; (( wns,lt; ac power source. What peak current flows througr:q;ch8dzyqe( m;;p tl sr (wt8,hln 2h 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. Wy3 moxuc-n. w*hat is the peak voltage acrossmy- oc uxn.w*3 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 a8yo pf6bo.7dit can carry (in order to prevent fi 68y.bodoapf7re 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 copper is $8.5 \times 10^{22}$.)

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