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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 chemxp+p,ffkp,xphma:d l w .kq5u -9ao;7 ical energy into electrical energy ip,kx;pu9w:hfld-a p qmp5kx.7 , +ofas 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 wire's full cross section at 4t( y5awtle.heo ++jpany point wy.e h5a+ (tj+4olept per 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 be the directi 4lxe4;) lqqex +5tocnon 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 same aq6ggk:u4ym+6ln hn e 8s

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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 measure of their/iewt 7+- ev7adr88jt rv(foy

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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 wp+ yh0j0w5 zkmsrwo-8ire 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 9pw v*y5skra9v 5- zxvis

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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 wirezh a+9p1wfnpuh1tidw9c- 13d,r *x x r depends 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-wqlw9m jl; rd:*njc cp.f9l 4 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 xuo8pgu0)l4ijimc *4 ll mx ,4length of the other. How do the resistivi ijmxlx lucp)g 4 84u0il4m,*oties of these 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 two .khgr9n( (suwa t7w*ice the length of the other. How do the resistances of these two wires ( w7*u nrgkasto (.wh9compare?

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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 area of thek o tt3m.hpdlr+5d.a( i kts1g po7w90 other. How do the resistances of these two wo3(tkdros adg ttwkp7h.ilm. p1 59+0 ires 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 t gstv- 8n9xu.cv: tvi)he cross-sectional area vxg8v9:tcu )tnv-.si 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 wire is douo:s(eb)ec xz4 bled and the radius is doubled. By what factor does the rese)4xoc:e(zbs istance 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 rxfsb 9h0ft/l/ r 0go4rod have compared to a 2.0 cm diameter 0b tsr//9oxhr04 f gflrod 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 modq)yr) -zj r .7uxw4lhst 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 c): w ;ureu vy;l7z(iffoefficients 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 to?v+6skv9cjq +y

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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 efe :j 2iuzzlh-z1rzdi;;eu25)2ppz xquivalent 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 doubled, yqx;f(to6xgok0; lho)eyt9 r7) dm r0 the power dissipated br r;ykot;(y0x)md)oxoq 70th9 l g6 fey that 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 constcwbz1n1*y kx xcj8g/6ant resistance is doubled, the power dissicw k xx1y1z6 b/8gjnc*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 doubled, the )bb 6hi/b0 zgf8n:jr7vil,gupower dissipated by that cih n/gib b0ub z,rv7 i:jgf86)lrcuit 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 thro ki( e-xggw,/x1hj (gcugh a circuit of constant resistance is doubled, the power dissipatge/xk ( gjchw x(,g1i-ed 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,+ m1ms9,*fjccuil oa4jbx1 ,k the voltage output is reduced by 5.0%. By what percentage is the power mlx cc1 ou+i,k bs1*m a4fjj9,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 time is referred to +szfavj +z(-u p (,zcqas

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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 vh:e*ww;g oc6has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wirec6ohew*g v ;:w 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 esse0ci tqz; 8+uqs. zwsk8 s*m2emntially zero at very low temperatures are referrek tuwm.0;28csz* s8 msizqe+qd 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 +1ak(i vmh/u,t6 tmgmpoint 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 elq r )eqms4t )q8m)e(qs, kjup;ectroplating apparatus in 2.0 min. What is the average currqs4m) ;qm k)q8ejquespr, t()ent?

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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 ;wn8qjeumeq*2 - t1hh 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 flowih /v; uty/.idga 3ub8wng 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, whichrdhmf9(loe+jj 3wg 7m0.ev- h draws 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have passed through the coffee makjvro3ge9f0e-jm +dm.hwlh (7er?

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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 tyl4vm /d) 8md3nv4ft to deposit 40 mg of silver on a metal part by using a current of 2.0 A. How long musvnm34 v/84 d)ftltydmt 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 flowwhhkt m;s57;w through a resistanckw; h m5hwts;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 resi2ryssw m:f +0w.1u fpcstor 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 curre vagd57w2z-ko7e ;adsnt 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 curren9fm 3z9/: kat+ck0:y pbmyr pz.ge. nft. What is its resistanceka0t:k m: .n rzcf 3pepyb/g myf99+z.?

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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 9 jfbcipergae9;yh5v g7,f 7b43ikv,flow through ecb9 ; fa7gky94r,3pbe7gv,5hjvi f ithe wire 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 rx+w tsonl d8g 8u7c *0u.hqod3esistivity of copper o+o07glst 8 xu3c.wdqud8*h nis $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 circula pwqv ljcb4ju9*:oouv07 s9 +wr rod 1.0 cm in diameter and 45 m long, if thewlov + v pjbq4* u7:0ouw9sj9c 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 copper wire (refbph6. j564 vkvoa cy:sistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistiv.g cb757nrhvs vb/i6 .fk 6kutity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 isqx8wl/vk(9ytl y9m 2* )niqmz 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 i e qj55gvljc:3s 0.321 mm) nichrome wire if it is conjc:j q553e lgvnected 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-sectn7) dq+k .lhmtion, 1.0 cm x 2.0 cm. What is the votqmhnldk)+7. ltage 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 pbgwn x vl-0m5f.ga6. 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 (resistiv41qx 1j-)if wvre th5 py 1zas-;vu(awity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 res4x-arjs/ut og ;k.mg;:(aac ristance 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 platinuwm a *iob/ 01i-7lolej86 kg9wb:oto sm 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 determiwp0rn 0i/bb 4gksx n-.ne the melting point of indium. The resistance of the platinum wire isk0wpir-.sg 4x/n 0 nbb $2.000 \; \Omega$ 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 throu 0hn6k uo.vtc6l4ji-tgh 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 curre k(qr (hs0;uccnt 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 62ut hser h70+:5qsd 6osdoct110 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 bulb designed to be used in a 12v da0-- qy*w ulvbq1(wwb-v(v ayq w1l*d0-uq 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. lu(4 oh3.-znp e8updg What is the resistance of its heating element4p8lu-ohz. ugn3d ( pe?

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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 1fj mrh3ygy 6u3wtkizw; ,e+p+g( b9mat $1/4 \; \Omega$. 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 xel1 dy icb4+;b1.y k;jb*d;qrbg9s i$1/4 \; \Omega$. 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 does a3/ ni3g wz,ibit 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 a+9st0r zj ,++wfl htzpt 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 i43k4r4yx*w 59kf x+wj)qodp gvfh2a s s 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 operaty82epxbjp 6o box6 -mcyqnr( 9wa i*8.e a 25-W soldering iron for 8.0 hours, if energy costa.68cxpmxroop8*n62 jwiyb9yb q -(es $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 ligh,igzz3-yz 3o4t eo cfxny)1x /t bulb 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 a 120-V line for 2.0 hourxm 68sc vaq3(bs. How much heat energqxbvma8c36 ( sy 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 th9yyvm kg0o3 f0e battery store?f3myk0v0oy g9

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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 usex 7unoo;yfe )eq* ,a 04bmrm+m 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 +/3kaz cr.qnp8 +sxy ci*7mzm per day. Assuming the power company charges 10 cents for each kilowatt-hour of elk qcc my+m*.+xriz/7pz a3s8nectricity 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)e2 tozr:jw )b/1ozx:r is turned on 8.0 hours per day. If electricity costs 10 cents per kWhxboero)w1:tz z/ 2 :jr, 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) electric bid zy qd3g)243fm8z o.8l fnmybll 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 monthly4zm dzd8oy)f .f38lm 3n 2qbgy 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 operate bnk: ld a3 81v6-sgm()kvvelys 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 n3 a8bml61vkve )y-s vl:kg(dNichrome 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 thro1qmkr r/cjh0t7q -7tc ugh $8.0 \; \Omega$ 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 costs0,qd44sdbe:5 befkktu-obu2 ta g 84d $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 w0m )cjyyt9;jy gs;ei* ork at the rate of 2.0 hp has 60% efficiency. How much current does it;*et9jy ;0)mcygisy j 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 rmh9lhd ,29bqp7 :d:rv *ek qrdes current flows through this device?der:lp 9r7h2:e 9, bqdv*khq d

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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 pea. ln4v:v ud93u, pu,;x8yjpov2vkxxj k current flows through t9 o.x;vyvxvpxuu82vj l4d: k jn,,3uphis 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. Wmllbt)*/(wol zf(k 3 bhat is the peak voltage across tbmwt(kz)/ l *(lbo3flhis 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 coppek6;)6h7j5) n n,tqywvsgmuf h r 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 centimete65)7)hshvgu qwm kn,; j6f tynr of copper is $8.5 \times 10^{22}$.)

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