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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于题库网 (https://tiku.one)， 为试卷打印版，您也可以在网站平台(https://tiku.one/)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://tiku.one/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 e qr4uclx((kdjvdpetnmf1:7,2;bg e; lectrical energ4k: bdn1,jf e2 c7u;gld;(xtr peq(vmy 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 (qxez6cf/d7athrough a wire's full cross section at any point per unit of time is xez 7c(6fd /qareferred 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 conventioz 0 z 0advfg2b)uho8d5n current 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 is the sameezlp hk6 os 4ox4qv3h-d)m n2+ 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.r2n q.hels 72l" 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 wab36yl9/x omzire 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 w i.ku3u4 eb: v4tnpp8iire 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 dw-rbqmg .6q,s/vdm5 y epends 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 res ,iiwslv8i7-w istivity 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 lengthme 1lxb-g5c*c of the other. How do the resistivities of these two wires comparx1 eclc*mb-g5e?

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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 dc h-ssi*d3c 2,ib sx0fo the resistances of these two wires s2-dsi0fbh 3,cxsc i* 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 ar(r/ o1jrw ,9qb+-nyvyz fsgq6 ea of the other. How do the resistances of these two wiyyso9b-nq( v16 +rzfgr, qwj /res 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-l+cm ppw**9f gsectional area of the other. How do the resistances of 9cwp*fmlg*+p 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 factor dd5 b)bx 4 tq33pint*jroes the resistance ch4tp3q*btd jr5n x3ib)ange?

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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 cmj9 :f8pf53ayu g b3tbb diameter rod have compared to a 2.0 cm diameter roy ba8p5jbf3 t3u9b gf:d 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 common metm8u;4i zx3wp. jr+mezals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature col0l0q *n6z -j3uz/+ha vmzkri efficients 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 equivalen;s fo(/l/ ypsk1sa,a1sgq 9ajn2* isjt 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 equivalent ts0b5n 41q87ieep: :j lk)pkfcv nk9jzo

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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 dissip tcr ura(y9y53ee;/ 7 .jvnoaeated by /a eo(3v5e.9nu tcrra;y7yjethat 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 resistanqrstoydw + * n:+p144/ogib gkce is doubled, the power dissipatep yb+tq si4og*4 +kg:do/rn1wd 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 doubl7 a7nalkz 7b0wed, the power dissipated by that circuitl7bn7aw 7zka 0 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 cons o 8eda m )/u/8wzylr*0;tzg/.gtjesjtant resistance is doubled, the power dissipated by that circuit y) 0/ za*dmt8; gesgjlow ze/t/u8r.jwill

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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 bv y9 fri)1skfnr8+8h yy 5.0%. By what percentage is the power on a res8v iyyk f h1rf8ns)9+ristor 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 is referred to ecuf): iqch5 2as

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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 wiibo m7g+h* i4are has twice the diameter of the other. The ratio of thbhm7 aioi+g4* e 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 es;y40 x;nypz fquaaz9 r5p4 u;wsentially zero at very low temperatures r n4pxu u; ;;azy0pfz4aw9yq 5are 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 flowing if 0.67 C of chafygp;ho1iads7d* / i )rge 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 electroplaszwq6dukd qya f,r3 ( 9i16ov+ting apparatus in 2.0 min. What is the averagr9 ,v6do(ki 3zqsuf1a+ 6dqwye 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 frtju-, n)-gdytp d:s 3or the 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 flowing if wuvnec /m qi 7d8r0e7 ib.55ib$4.0 \times 10^{16} \; electrons$ 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 current, has been left on for 10f lrkz(a hz92lceo83f,d *om-sull32 min. What is the net number of electrons that havfm8oae2ls lz-9,3cu k*rl3d zl( oh2 fe 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 depos .lny3vp9nll4 nn(i+ vgr;c6 nzq qi3,it 40 mg of silver on a metal part by uslcn63n( .+n,nrvq4i 39yz gl lp; vinqing 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 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 to flow through a resistannbc6yw t6v6;lj) , ig1vntql6ce of vb6)ygl t6i 1twvq,66n lnj;c 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 current through it .ql4 /bts8lmu 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 fly,v v8gag 429oc4 ycr 8mi3 cc,edq5sjow?

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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. W+xtabgtx5 jw a yc8r8 dgh6-s2m/ 1t1jhat is its resistancej8h+cbtg t m1y 1/-tarsd5g x6w8ja x2?

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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 rqytzvwa6mcbrc.k 65(n9g60 io, hktio ;g 3l9 esistor. How many electrons flow through the wi(rtnb,65coh 6 g9tvl3zmk90w6 ga;cioiq.kyre 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 cop2(mnw j p8i: vn2(0 nl6:ixxkop ivt:pper wire of diameter 0.40 inch? (The resistivity tv ow:in :2 kn p0 2(ij6p(vmnx8pxil: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 of0mmy w eqgu22gj6 j/y7 a circular rod 1.0 cm in diameter and 45 m long, if the resistivy7jq/ 6w02g j emg2myuity 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 (resis83 ghl bbjecq860 /:b k.vowgmtivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 fl)-n*sy 9 gp7cz3lj qa.lq s.wire (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, measu)ge3 z qtzx/b3res 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 rad4db,s x jz8 ci(f bon9nhtne)ks9*4*nius is 0.321 mm) nichromen9nj),b sf*toc *4b8(xin zshe k4 9dn 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 rectangular cross-section, 1.0 cmnd1bzbsp0xd 6k rh 8j6 ,5qrxw1w. sl*;fl;ga x 2.0 cm. What is the voltage drop along its length when it carries 40006r8;w;lb1fls p dnzr .qx5ws kh1b0 *6ja,dxg 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 wim(1 eq,o4c cgjre 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 copper wire (s -tdhcbml+ :ixq84;y 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 q0ttn(imzmp5uqii cm:c 51):a 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 :ygxiz xl1pf-0 6f qdw.o:5 qq$3.9 \times 10^{-3} /^{\circ}C$. 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 ie3 xa-xk3dkw wc92wp4 i 01pqpoint of indium. The resistance of the platinum wirexx2cak-3 qp4w19kw i 03iwepd 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 anfkg7nz/ k b849xiyr6 u $10.0 \; \Omega$ 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 curro c /v/xvhs-:-eq qj m.nql02went 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 d f-b(agl 7lmp,/g*7 zzid8z qdraws 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 bulb designed to be usedh ec-.4q4d*jw6ou k,pwechiz aqy1 cu)2 x;7p in a 120yqj.-*e2;6 ich1dc,oh4apu u wp zxwcke7q)4-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 theqs nxa8jhyl98 7lc 2pdv8e/+q resistance of its heating elemenj dapyh+7 q8q xe8/nvs2 ll8c9t?

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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 raemp+agl gl -z ecd(92.ted 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 w ye8gj9pt0- xrated 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 at 120 V, what current dq6+2idols3 bzc;3 dkw oes 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 usf.w;xq54 ld+md 9rr jjed 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 resistancm1/ p+ xrw xyicguxe r537/7hre?

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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 cw s/tz9h:blk(s dv)k 9 7ccv5 wf9l*boperate a 25-W soldering iron for 8.0 hours, if energy costs f c7w9zlw)cb dch9t:bsl v 59/k*k(sv$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 ho5pl /w74xx- dsr8abgqpd6 pvi80z qisd 15bn(urs?

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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 dqfadno;+9r8 1 pgq8k 120-V line for 2.0 hours. How much heat energy is produced?9g +rqqa81fddo8 p k;n

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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 muc*uc t)o2 *acvrh energy does the battery store? 2c*vr)t*aou c

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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 solderin2zbp9h cq7p08 vv c-uig 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 p 7y6x5hwtqpr0 er day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annr5x0 wqpyt7h6ual 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 turn1.abruu tmvub 2csbj s9rtqv/+,+i;xp0s- k, ed on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the computiav+b-bur1j,0 v /bxp;. mukr 9 + tts2qcu,sser 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) electr)m9sp h 5.;k bes2puegic bill included the cost of running a central air-conditioning unit for 2.0 hr/day at 500hb.;ee)spuk9m 2sg 5p 0 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?

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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 ele+7 ;c,zvoqsq vctric 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%. (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 e 7;q+v,zoqcs vlement?

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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 flowsm*;ses c/39gtmz/9wi,mt mvo6 mjwb pb3*e c8 through $8.0 \; \Omega$ 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:+v s9o4 ulqit $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% efficiency5 vpqfjdi2(ze6 1/twm. How much currentj(f1q5 ep6w mid /tv2z does 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 source. What rms current flowaiy/(a -m4vfgnz in,3s tna-i f/v4yz( igmn,3a hrough 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 ac power source. What peak curry t 37e:k44:38smbsiopnvf xs ent flows through this :v4sb7nf 8t 4isykp33eo mxs :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 125/hj4w6wg r bf0-V ac power source. What is the peak voltage across this device?wgj5hf b64rw/

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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 copuv5o6k)*3jc1cqr y ff per wire is 0.081 inch. 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 the electrons? (The number of electron carriers in one cubic * u3jycfv oc15f)rk6q centimeter of copper is $8.5 \times 10^{22}$.)

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