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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://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://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 transforming chemical ht1dp u:ib5pu4t1nxm; /5gxp energy into electrical ene4t5hppb1:u x t/5pu;dmg1nix rgy 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 through 9 2to .liz0cpl.o ,epxa wire's full cross section at any point per unit of ti. .z,tloex icop29pl0 me 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 ;togd86lp1vtthat

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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 samde :4gsk(si6e e 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 rath i7u;b3cyvy) 5 lr8vif p2bn6 teh:r(ed in "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 definedw+d;9s r*euxm 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 +w4x q8gwm t0yis

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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 depend; ndmww(n/ku.5a .ay ,q6thfrs 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 valu y+(s, yzj f0mfa9lj+ke?

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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 other0pbe;l t9/4mr6tyx sc v5v(rhe-hpg2. How do the resistivities of these two wires comparer(/6hshcg59x tyrbet -mv;l 2ppe4 v0?

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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 t1r7wapwyv nqj.x v69*he other. How do the resvypx an.1j7qw6r9w* vistances 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 crossmlo4/m2p wprx7riv 01r4- jvg-sectional area of the other. How do the resistances of these tworir2mg 7/ 4m 01vr-x plwv4pjo 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 len7zzzh8k d(m z: l;1cudgth and twice the cross-sectional 8ud7 z mzhkzcld;z(1 :area of the other. 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 wireiayx: ; n1a-jq is doubled and the radius is doubled. By what factor does the resistance changen j;a1yi:a -xq?

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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 2.6 s*xr6hjnrqr dv;inl g67s7jsq +t..0 cm diameter rod of the same length and made of the same materialv 7ss ij gn7*d r6j.x6n.tq; qsh6rl+r?

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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 metals:kheuqu7gm00 nu )hr* gq mt*a/r kpb -35gci1

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficwk8xzvb99fgww 0hv/q ac)z1c/ og j*)ients 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 t- px1u4x.np hro?

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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 to ;4x3qow6rxju6mj bi(

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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 circui89uicnex ,o5s 7ni)qit is doubled, the power dissipated by that circuit wsi ce5u7 )n9iqoi8xn, ill

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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 consta)bbblkrpz 8q6t1q ( 2vnt resistance is doubled, the power dissipated by that circu6(qzr8bkv q12 btlpb)it 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 cboja*ryhye)s-bp+ zl- 6 : gh.urrent flowing is doubled, the power diss.hohgrl a- -bp)*6z se:bj+ yyipated 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 /fw5nr4h0id)b z5vse *g7zupa circuit of constant resistance is doubled, the power dissipated by thatn dgb5p7w 0 z)e5zsriuf/ *v4h 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 reducyd )xef s3j0-xq-c;h (wwx)w p mrn;u5ed by 5.0%. By what percentage is the powerf0wn-w ;uj5edy 3 q rh; )xm)(sp-wxcx 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 timgjx+ka-a-b8t4l 98 on5uyy nce 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 cbbc,r0/b o*ururrent of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in the larger diameter wire is/,rc0b *obr ub

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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 /sdn4d 9wqwo+8,qiebat very low temperatures aronwdb/, + s wq9q4di8ee 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 charge pass a point in 0.(.1d reep3ly1c uik*r:ozl j7 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 in 2.0 min. Wha9mxz22yjq, ;xk-y trwt is the averax k, ;2jyz2 9yqwtx-mrge 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 passy +c5 r -y.ly5;dm*zv9jaau bh by a point in 10 s for 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 ipq45 o. f zqq8s.38u kuz,gpvaf $4.0 \times 10^{16} \; electrons$ 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 g) 4wpc2jstf+A of current, has been left on for 10 min. What is the net number of electrons that have passed through tpfg wcsjt2+ 4)he 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,g69u j sg,;jlm8x oosn2g bj2 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 gn,m26jj 2ob, g98lsgs ju;ox 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 *z7-5jr..gfz o/5s7ff;p b gaqglky mthrough a resistance of 330 Wggbo -f7.5. f;f p*qj rskz5gm/zla7 y?

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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 an- h. 2xtb2m:iy ujrmf:os.:l cross a 5.0-W resistor 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 l jf*k-/f lwz n1g83jbacross 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 1.40t* ll.p8gdmp * A of current. What is its resistance?8pmpg.ld* * tl

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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 manhssk73 1zt p5*rac:ydy electrons flow through the wir3razp d 75 *stk1:hcyse 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 h5nrfy/p9+z63gs b.ur5uv cs of diameter 0.40 inch? (The resistivity of coppe vsrrf zn.5g c/ps369y+ 5hubur 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 47 wbiy: sc;dnnq3:uu95 m long, if the resibn7n; siwu:c93ydq : ustivity 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 (resis-dze wks gf6 4( 1;9msqc2lqykl-1k* trarr,xtivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (r.b2fai80irbm6g n y s89unt8v esistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 0.040 ohms. What is its resistiyko8a3 c ugw.r+snkk +:;e v3wvity?

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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 u-cuzu+nz)p4 gnbw; eh-x6 z,mm) nichrome wizn zun4w,6 ;u-ue-p +ghc)bzxre 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 crosb/p;tbp 3-w4k*xbxqkr / u,ots-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistbb 3q k/u*-xp/p4tworx; kb,tivity 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 resis.virzjejjeev /c6,e b;;a m,9tivity 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 (resistivit e 903fu) lkg+zmzxvhk5apci3 4) +dcjy $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistance of :,d.xme(y 1ldtj- jc.:jb ;,yrqxx r cw6*zmb$18 \Omega$ 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 pl 1.ljzt;3m hcrybf3gi,0h lv 4atinum 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 indium. The resistanctndo ohvr5j ,)b+*zh1e of the platinum wire,r +odznb jo)5h *vht1 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 :mr a;)sqh by gjwc006an $10.0 \; \Omega$ 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 r/n4vn3v/i yn kc c9t+kjql stjsd56,-ated at 1200 W. What current 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 mu /h83 0bmyp:d0 e/grm6vuh ;6xjhlqcurrent?

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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 ( wflrbp3-xfgc f52c: to be used in a 12 lfc2 -frpbf(c5w3g x:0-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 rgq47yjhwg9 ajkg/5 z9esistance of its heating elemenj hj9z9 kyw45ggg7qa /t?

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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 )v(kj98j-wjfz,aokx 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 rated at )15wg)+9qd5um qqcbobo/ma o $1/4 \; \Omega$. 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 jq7yf ts- cp/kn *8m0;xro7zzbulb. 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 120 V, what is its/ :kcv4ce (ycl 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 its2t-er l0/ i2ftn(hc rl; iw7re 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 en, (s :h ek4eyt +sji7i5izv0rpergy costs0, +yjpsie 7thers:i v4z5i(k $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+py; udw9,3 c0,nd 6aswohaky 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 connected to r xd(4d z2n hfniy3;(ua 120-V line for 2.0 hours. How much heat energz( y2xidn4;f3n hu d(ry is 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 the battery store? v9 7aky5nk dpz:us+0u7z9 y5nus+ apu0:kk dv

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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 iron use in 8.0 h r8jm+fw l7i3hours?

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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. Assuming the power co m( dqqetiq74 b,qv8;9 9y1komc ai8mimpany charges 10 cents for each kilowatt-hour of electricity usey (89id47ik,c8qv;t q qqia1obm 9mmed, 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 hours pmbo *nm*x2 o4jer day. If electricity costs 10 cents per kWh, how much does it cost tojbm *4no *2xom 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 l1kyz w+x n*3e9; +o: 1xbcs*u+mtnhz* drccj 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 contributex+ydh+ 1czcwj 1;t+3:nu9o n r*zx* kbc*el ms 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 electnud:q3+;e3 py uzd y0eric 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 w pd:y0uy z+3 ;enueqd3ire 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 thro8c3xh s 1y3hgxugh $8.0 \; \Omega$ 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 costs1xr4u f5q 0cft $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% efficiency. dgpmx /* 8i3nd How much current dpdnd/x* 38g imoes 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 sourceu mco0*upo3f:j m7b5 y. What rms current flows through thi5bofm j*uoc7:0mu py3 s 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 current flows5ndyz2io,s 9 k5:iq wg through this deon: dikw9,iyz 52 qs5gvice?

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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. What is the r: gm7y qgo-/k*ljr6cpeak voltage ac-mrglo ryj6qg/k: *7cross 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 cc 1)pf uafv-nto7+1fwy0 v 7qfurrent 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 f7) qyu +-o0fv1nfwpa17ctvf copper is $8.5 \times 10^{22}$.)

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