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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 espfag2 i y)/.f)zll( hlectricity by transforming chemical energy into electrical) a)/zh2s .p(fyifgl l energy 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 a *d,:gegdo .yxwire's full cross section at any point p*gd,:xoy .d eger 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 taken to .l1e:ifdci6 9npy r*f 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 thes.qu ki c6*)ps 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-hours." This is a mzy1 ff x,l) p+tecx6)geasure 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 + k63c0xdcggk 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 p7ygp-j i3*9*dqjx i, djo,+jwmam0his

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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 dependso/c ez)u.n y wbsr3u5c4:(d fq 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 hahusv( dg 2e*g: rz:i)ds 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 ta7ozc;ft3j 5q*2;eb7 o u ywuuwice the length of the other. How do the resistivities of these twou7qjfa*w3e t uy bou52czo;;7 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 other. H g4fl7/hr(xf cow do the resistf7 chx(4g rf/lances 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 hasj4l 2fus cay 8;*/gk vf9l*ueb twice the cross-sectional area of the other. How do kc8fuga*/l2 u*eyf s 9bl;4vj the resistances of these 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 cross-sectioau,h, )ckm, r .7gf: urdi4gwhnal area of the :rmd,gf. ,uk 47h,r cuwhaig)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 wire is doubled and the rm+) hi-0 yl 2jzjrx6lu4b3 wgradius is doubled. By what factor does the resistgjy m 2h)6jl04rz+rbwux i3l- ance 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 diameterlofz) 6dc1jv1 .fq y2j rod have compared to a 2.0 cm diameter rod of the c 1)2 jffvz6 doyq.jl1same 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 m c-k b kkox41f+m(8hpj(lhf;aost 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 resistivityb v6*ayb59 dvr

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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 toz;jtjzs6/.r 7nmo6f x :rt8dh?

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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 equivale q6w: 0emw9kk;uj;r ojvobb9/ nt 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 conynm.d8 0hw7 tfstant voltage circuit is doubled, the power dissipated by that circuit wiyw7m0dnt.fh 8 ll

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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 constbz/)9s.xr dxk ant resistance is doubled, the power dissipated byr.z9/xk sb dx) 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 cu*rvowlvp:cl) g:;5rkrrent flowing is doubled, the power dissipated by tg vro;lr::l w)p*k5vc hat 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 a circuityh(a: x0oxpcb4: gsv5) 4qvykauq2e2 of constant resistance is doubled, the powe 0p)hvyos2 bce u544:ya2gq: xx(kvaqr dissipated by that 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 5si11pu6s laob9d61 rs ; 2n1ickwa*db7lu9bs.0%. By what percentage isbb1 aa6 1l2sil 1dsrsdw1;i6ku9 n pcos9 u*7b 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 alvx7 61pk8 7 b,(pboy9nkv6nyq4w vzto 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 twice .z+)byq j2i-zb 6saz1 j:kwxfthe diameter j: zz 21qzfa sjyb+-6xk b)w.iof 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 tkwu k4zunx3f9;sq 3 p2emperatures af ;wkuzxu2 qk343s9npre 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 0.3 lw nr,bq-n1/e0 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 appa v xpy;dqxnuta+j9 v -,+puu;+ratus in 2.0 min. What is the average current t9+pyup+xjvdu,uq;+v; a x- n?

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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 ad,fapg+ k9t bq+0gae7 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 if; x0btjedrq 5v8;py h( $4.0 \times 10^{16} \; electrons$ 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 10 min.yo rk 7j,e4 ;j3(;e yc;bccqdlh:jf2d What is the net number 4eqcjfyr;;73c declj; yj 2(bod,:hk 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 d)d 4kr(kf v c32/qyg87kepc9nlm t1vreposit 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 tt kre3gcy v(kfk 4p7r1n)9 2c8dmqlv/his 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 dabyr0 z-zvj7 hk0ih23s g55 nuvu. e:a resistancg3zvsjyr05 bn dk:hza0 hivu2u5e - .7e of 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 agdi21izkpanj eo-l,/-,a +u9gb6v kthrough 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 220fw p /b4st)ap2by0 j*du9az:i 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 m:t6 r d4(m4ujylszi9110 V draws 1.40 A of current. What is its resistance:4ujs t idmy69m4zrl (?

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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 resisto xk*cn+5 9scior. How many electrons flow through the wire i+k9ccon5 si*xn
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 r nr tf:bq.*5oresistivity of copper is n:5roq* rf.tb $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resistanu,-pfecf,6,r pjo4 v4 jk6 wdendw5 (mce of a circular rod 1.0 cm in diameter and 45 m long, if therwcow d4uk6jp4n(,j ff5 -ee ,6pv,dm resistivity 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 coppeq2 *sxd:9:f:t(tej vs bvyfa(r wire (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 ( ym9 . okea5qlyn1gm c/n un*xd5d)l3/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, me owrn+2af q6n -p0s3jlasures 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 1hphacbve 97r0x;w fs,(rm. * s0.0-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 nic;fbpaw sm*h70 9 vrxc,erh.(shrome 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, 4cey 1j/l ke i7,:jyqc1.0 cm x 2.0 cm. What is the voltage qk c4:/jjycely1 ,ei7drop 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 nichrommg5w tl0 haib(6f0r0ze 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 copper wireg/ ;ofm3 ax/;0mlu:vf pudpr/ (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 q;h c7cve/r5z*d k; ,wmngoh4resistance 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 resistiv30un-pgv y4 p5;ftq5l g(fbsp ity 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 indium. Th ry19 n8ag;d 35)fg hpxv5inmve resistance of the platinum wire isigm)5 9f;n51 axhdv83 ynrpvg $2.000 \; \Omega$ 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 th .dur ed2t:tpddap2n9a- b.n2 rough 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 cui6w9sf8 jxj g*rrent 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 runnfbsui8f, bv9 2ing 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 resista0vjoh kw gj r- v,+wo;g99qug3nce of a 100-W light bulb designed to be used in a 120-V circuit?v9j3rw-w;qog,0 k ouj9+hgvg

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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. Wha41 n.ww3z 0wawgiz4sf t is the resistance of its heating element?wwfnwawg34s4 .i 0z1z

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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 at (o u*m3ra-roe.c j-;zh;(iqqmpa m1j $1/4 \; \Omega$. 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 racs2s: bf uyg.5tt ;i7mted 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 buxo /zl8,xmm6 nlb. 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 resistance? m5lcpps44)yb)gvb : t

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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 xwbr)w 9fzh 8j/lj9:mits 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 g,;w 6vwv u4+ftxa3gnenergy 4axwug fn+g3vv6t w;,costs $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 hot, g9kd951dka 4xtg gwurs?

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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 p w6im8txrns fjp7927 for 2.0 hours. How much heat energy pjs9p7w8fn7i t6 2m rxis 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 r-u 7plg90xkx*p ey0pr2l ( wnV and 160 A-h. How much energy does the battery store?2 pgn7yklrprp 9x 0(elx*w 0u-

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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)g ;4mm tug.y.iazd- m, mb:im-W soldering 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. Assuming the power; +m3gsoy yg3h company charges 10 cents for each kilowatt-hour of electricity used, es oyh; g3g3sym+timate 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 (compuvvgsl 53(ilqb 2u 6+utter plus monitor) is turned on 8.0 hours per day. If electricity costs 1v t2bq6uls3gliv( u5 +0 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)d 4.ew5xvsgb - electric bill 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 fo.5s vebdxw4 -gr 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 electric drier operates on 240 Vq4l+sv 31gt prrlvb u4*0az456jr k of 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 on6vbqtpr5z jrl0 gsa 4*f 43klo4u+vr 1 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 tcu-gu8 (gws 3im1dj f2hrough $8.0 \; \Omega$ 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 costa7 48x q4ik3g aopho7fs $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 4xzgrt0 .xz stf81;rywork at the rate of 2.0 hp has 60% efficiency. How much current does it draw from a 120-V line? yxtzr.t s4xf80z1;gr ($1 \; hp = 746 \; W$)

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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 powerm oyhd htzj a5d33c.1 l*s0ya8 source. What rms current flows through this de1t j0lham35 od3yd*8s cyahz.vice?

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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 z9/jrwzbhz12 current flows throuwzz19b /2hrjzgh 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 9+8lg5uft mwo: (j bmmpower source. What is the peak voltage j5+bumm(wtlmfg89o :across 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 in (/u39z/ g2ms 1vvpgppvhq0 cnch. The maximum safe current it can carry (in order to prevent fire danger in np 2g (v0/sp g/1muvz3pchv9q 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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