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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 transformin6kg pn..9,(:fnfl btn zhvr)dg chemical energy into electrical energy is called nnb,h9 g.:frt)6kd.nlp z f(va

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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 throughf2re zwvcx/i t+ 3ph/7 a wire's full cross section at any point per +i/pe2xf7/cz h3tv rwunit 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 be9y a d 5jo4d36-qacsbw 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 saq3 zu*b;y- f llpbh- ba;0ldp/me 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 "od 3i ,bws8t:blfj;0+1fwr)e89vq du4dldy d 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 wir(/m b*wl:/p dk pb+dvme is 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 wire *eh ywco+*d7w* s w+zc4tpg q1is

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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 depen).zvyli0piww bi5u.vs (u1 g7ds 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 vals2gon.r) 2hpk k3m (g kim4k q3f0s4ynue?

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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 lengthj1rixvu 9oi .( of the other. How do the resistivities of v9.(i1oujrx ithese 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 othftq r ;hfo2- a3q 5af4iat g(;brfg7(wer. How do the resistances of these two wwgt45f fq -gr qh(b2o;7 ra;(f ataif3ires 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 hvi lv2*2 hm1pw/ ot1yzas twice the cross-sectional area of the other. How do the resistances of these two wires compare?t 2p/2 o11hz v*wilymv

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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 crw *vl8+ fa7yocoss-sectional area of the other. How do the resistances of these tyv 7*wc+lf8 aowo 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 ra68 1bacdkqe o8dius is doubled. By what factor does the resistance cbqo8a61k8edc hange?

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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 diaf( )6mupkis4qkr; 48efe fp 9zmeter rod have compared to a 2.0 cm diameter rod of the same length and made of the samf6 ru4s qkf;)(e4 e9 zm8pipfke 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 common me1-e03jw esxzf tals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coeff2mv t 1x+ytu-picients 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 *z n) *l3 (t(wyc,m mijg*dmzsto?

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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 equivalent 23ddt) zp6 rad ) s8+ gio8ib1ngd:guvto

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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 power dissi x+euw1gzf t**pated by that cu*gx1 ewz +tf*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 co(pjejv to+8 ufi0)l-xnstant resistance is doubled, the power dissipated by that cilxo-) ei+pu0jft(v 8 jrcuit 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 intm mqp2gapc8:.dcex2p (4u.h c9a5gp a circuit with constant current flowing is doubled, the power dissipated by thag29pdca m.5 geh(:4acq2t.c pp8pxum t 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 throu,l y z+b 5:dlhp3ry52mxa( qblgh a circuit of constant resistance is doubled, the power dissipated by that circuit wiqy5 x:5 by rh2az,(mll3db+ lpll

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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 gho:sg 9 ;kxowk 4e(t;what percentage ixg ktk;h 9s;e:g(4 oows the power on 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 respect to tf ezb 7n6eafz i3s2s,6h, -mosime 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. Os5n) ud7le(jsh1q m x-ao5 uo1ne wire has twice the diameter of the other. The roe)q5u 1lja7 (m 15xu-hnsso datio 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 tg ;(5yhtpq.le bp)3 dqhe resistivity becomes essentially zero at very low temperatures are refe.3bppdlg)q q;(h yet5rred 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 9y3ki9k :p+1hlayqd(kxmo0j 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 passe+ .b4- wdyybdo9m2gn)dq4qais through an electroplating apparatus in 2.0 min. What is the averagdq 4 a- )4wi9ydbodq.y +gnbm2e 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 bce/u:sa4b(7 ult +mn3 qq4qm0.50 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 flowib1 :(*zqct ockng 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 drawsfl3vlnwx) l 59m r)/ec 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have passed through the vnfre9w) 5mcll/l3 )xcoffee 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, n/;-gwj, a:zr1;cw4p smki c, mjurb:it is desired to deposit 40 mg of silver on a metal part by using a mk ,wm w;,u1-jb:jrpgi4a; cn/rc zs: 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 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 causq9(l5 v- 8y0j fgr- (vantdijse 4.00 A to flow through a resistance of 330 8-5dtjva(l0qjsy-9n vrg i ( fW?

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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 re-6(/o hgxc qods i*gp8sistor 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. What cur zz ,p)(x q*mrd*6ebxnrent 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.h nm(upu/9s)c What is its resistance u)m/ sh9(cunp?

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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 thrz(g cw n*xxp1q,vyo+ jp*9m c,ough the xmc ,ogp yxjv, czqw+p*9(*1 nwire 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 diameter 0.40 inch? (The resispzu 6.a*cwx b0tivity ofx.6p a*cz0 buw 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 yur jev00q q2:djhh9s)r, e 2zin diameter and 45 m long, if the resistivity ise0vj20ur hqre :d)9q2y,jhz s $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 (rzvvozgw2fwz ;bg:jp ).* lw od.7n,)yesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resisti/h ax2wd saumy 49vnhgy 84g,,vity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, measureg8l g2ipp7n4 hs 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 223kyv .i7)-*figszt ql gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery.si7i lty-vf)*3 . qkgz (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-section, 1.0 cm x 2.0 cm.n 1r 87q88 bh3tmft u6rnfpzj67j lip. What is the voltage brh 8fpnj 3zr6f lujq7t7tim1886 np. 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 0.50 mm and a res0u7 1kiqr u:ip8 iesq7heuy 80istivity 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 (res) vh6zzx j:t,i)csox-u.hw :uacdiz028w /s histivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistan5( ;p(bim0zfv pwint2swd0-kce 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 coeffici6/r ohcpnmrzr2d( r;0ent 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 melty788y0m;o g hspmy.z. p;p wnging point of indium. The resistances hgw o;yy8p.7np08zy ; mgp.m 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 througpt/f(-c;e;9gcrimfwfo1 n+8ct fb +sb4rl t/ h 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 irig c2w j3cjqu-6i q*j/6pmv3t 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 mu .(tyts0t qq4 ;3pztwcch 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 designv lh2nsp00 i 6d.+vtkued to be used in a 120-Vp0dust62 in .lvk 0h+v 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 x wdw*+ m;msez v9sb: -e*e1evits heating elementv**-zsbw e 91m :+s meevdxw;e?

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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 ra-.fiku, lnn s5 5;yplcted 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 b n v)f9g3j(xhrated 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 :ttrhea1oo(l69g y/x 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 120 V, what is its resista 4zoxr3o+h/;0kul 1 qqpyazo18gae+,jyp et 9 nce?

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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. Whdb, ( jajuu;c:h4-db.qrt eoz h7v/.dat 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 env6 kep qb0d3enl/ 71ss y+5droergy cob7 dl 05 se3po6/q1kyen+r vsdsts $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 use5c2;8+zivu o/-sy it,; cr 1pejy odhf 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 hetrefg/ :4w3ao hx:un4-c1vp )ykz, emat energy is prtv: 3/fyme u41xe:nrz-h o p,4agcwk)oduced?

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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 atwzso4 eznmql(9 ),g)dx tm9q/ 12 V and 160 A-h. How much energy does the battery store?q tq (s9zdmw)e,4g/)xl mnzo9

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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 iromtw x 6-lwbr2 lp9ig1sc3(:mru :yfo2n 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* 2t 7y2pfre* a-rmlxn day. Assuming the power company chargetp me rn 7a2*rl2*f-yxs 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 monikz;zy.n.u1g ytor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, ho. gu.nyz k;yz1w 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 j 3;)f mcvvp4sp/zb9i included 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 cents per kWh? bzjp/39psc;iv) 4 mvf

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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 geveiq*p eq tyc5 k6jxv99.y5e. nerates heat at the rate of 2.1 kW. The heating element shorts out and, in repairing i ee69v.yvq*59yq . jtpckxei5t, 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 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 throur*+uv:cci** jfb : iocgh $8.0 \; \Omega$ 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 j x(zg.iyrxrk do):30 $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 atu2cv-ismq zu.7j 32js the rate of 2.0 hp has 60% efficiency. How much current dou2jq -s3 2z7usmijv.ces 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 sourcf khw;6 eda(5va.o ,xte. What rms current flows throd h,a 6k(a xf;twv.eo5ugh 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 to a 120-V ar 56:am:cxqb zc power source. What peak current flows through tc5 b qx6mr:za:his 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 120epm e 84,x(ey32imedpb8b pv7-V ac power source. What is the peak voltage across this device88,ed eb 7yib m4e3xpp2mv(p 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 inc)7 n6eu cw1joh97qb (avwo/t gh. The maximum 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 1jwou)(nh7vt w6 a /q o9ecbg7the electrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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