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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://autoconfig.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://autoconfig.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 transf re yv4emy9ui/ :z+g9norming chemical energy into electrical uyvy r/zn9:gi9e+m 4eenergy 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 wireypro pn9yk(57 vy,w)bsag-/ qt3 lq2t's full cross section at any point per unit of time is referred to a,k5/9yq-3 ba2)glw tr npo(vytspy7q s

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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 direct82*qpc chtft5-n ffo(x c0p edjc23w;ion 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 sugx;oyhy-osje 3av(o,-x q-6ame 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 measure of the 7gb( *4kdgs3 28nzlz 7qwxhnx;bm.n dir

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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 de::82ujj n f0yw nmdha9fined 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 isv+a,isb/wgd8oz zh5x.v:l7 d

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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 wi t,eb8kzb(vrv jbqkx;-v/3 *nre 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 matnzxvov2t )5vw)/:oex erial has 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. -ul9el,d.n fm One has twice the length of the other. How do the resistivities o9d-n fmluel, .f 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 twice the length of thea(xyy.d z(f5w other. How do the resistanceay.x(w 5dyz (fs 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 cross-s7fq*lki )c k.iectional area of the other. How do the resistances of thi7.c klkq) *fiese 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-sectiod .5,jhk 6kmlonal area of the other. How do the resiskj.h5mdlo k 6,tances 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 radius is doubled. By what fa9dm qomhpe-wy 6685+ re jfx+ictor does the resistance chani hpdxm8+ j5 yeoq696- rem+fwge?

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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 b swc zt+. l)w,eit:09.frjoito a 2.0 cm diameter rod of the same length and made of the same l 0 jz+c :witi.)9bot.srfew,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 metal*2nbuxsk8i5 h, 4eefvb5m0h js

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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 resistivitx2eb: dxg4h+kw ja b/d)*gv.rwe 5hy;y

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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 p(r:u fg*2)t bepoy-dto?

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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 equivg34il wp87s ixalent 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 consw)ms8hkp8 m6k tant voltage circuit is doubled, the power dissipated by that 8sm8k6 kmw)hp 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 ;h02mrtrc+cqp 4t5-7vaqmegrd1t5q resistance is doubled, the power dissipated by that circuit mc1754;gvh pm+qrrqct2r5a t-qd t 0ewill

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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, thhnz546.ls 3cq yyso -fwcjh* 1e power dissipated by that circuitjc 1oqlc*- y 6yss wh3nz.h54f 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 constant resist701 nt6ntht( pgmrk6 qance is doubled, the power dissipated by that cir6tnq(6r m10 gnhtkp7t cuit 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, thcim/ g2h2rx1*9rlh yxe voltage output is reduced by 5.0%. By what percentage is the power on a resistoricm h1 yhx*r92/lg 2xr 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 8(pbp)/lihi7 k+b8 q8g4sbp wpo,mqhto 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 a5 znv0-uc,uieach carrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio ofcuz0, vn5-uai 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 ess1wf 76s//fajw v omj*sentially zero at very low temperatures are rj f/sw vs71o *m6w/ajfeferred 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 v7 qqhng285to 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 passes throug9;wceoxhh*u9g0lsn vmd6 ( bl0a,/ywh an electroplating apparatus in 2.0 min. What is tsmbdal0u hc* vl0 w;9 hg nyeo9w6/(x,he average current?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 10t xy+ya:ma0ky 0v+(5trf(u qt 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 flowinxt l;1- spd9hdg 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 draws 1h j f+zye(gj2fpsq4;9 3.5 A of current, has been left on for 10 min. What is the net number of electrons that have passed thspj4 +hf 2(gy zfq9;jerough 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 procevras0171:s c4b thg yess, it is desired to 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 i17v1eh sy:0trc4sba gons 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 diffeo ci/ f77ro uw8) 1iannchv+8zrence is required to cause 4.00 A to flow through a resistance of 33if7zwcnhain+81o/ vc 7)u 8r o0 W?

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 i4 :*:15hppq pzxpfg)qcoev+ 5rm *soxt 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 co;- fhtd kt)8tz plb,-ennected across 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 1.40 A of current. + stb58f:c5ywlh+qd3hd6 y iax+3 wg nWhat is its resistance?a:dy icn8tww5 +dhq5x l3f+by6g+ 3hs

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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 rekz.(f0y5l +n oj edb,nsistor. How many electrons flow through the wire k(b 5e,+ yfz dlo0nnj.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 resisti6+3xpj bwuesk2*7jc kvity of coppexe763u js+k2bjk* cwpr 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 bwi4 g(o1wa)9x3pwjm(t qa v1in diameter and 45 m long, if the resistiv t va19wi 3p q4gjbmxw)(1aow(ity 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 (r uhn*-::qrm vyesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivim x,fi7ok2 6m +i7* jtktoy8tgty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistivitya fv+d5uz7ev.?

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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 (they+7 ugz1z0r n nk*1ado radius is 0.321 mm) nichrome 1d*u0ozazn g7ny+k1 rwire 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, 1.0lc .z-*)b0a(vn, .n5fht)au wtj j9otjot0gk cm x 2.0 cm. What is the voltago(ntt 9w-o bk * algv)00jt5cun,j.fjha)zt. e 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 w9j9vw g; 9fp4+eupwwwire 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 wia-le z5yb 0eo-re (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 resisv.ec uu 2w3 tyuh1h9(htance 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 platq(+wq50*l, 5 jg gc4mhsshqtn inum 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 ofe1b5nmpm,ur 5lxn 97z indium. The resistance of the platinbmx pn51 e,z975 lumrnum 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 th+v9bw pjjl9- dwo) puc*pf +l+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 current wi*fq0wp .zhp 0vdhw9h/j13btd ll 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 howfeaniwo ene*.tn g *eabg+.f5266y(e 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 ofbn(jnlxo4/ ) f a 100-W light bulb designed to be used in a 120-V circ xj4bnlon(f)/uit?

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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 its wg7 10;zv,w1 tso vzynheating element?yg ,t0;o7znzv 1vw1 ws

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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 bc.s(whi/ p 1uz7/ plurated 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 afq4kd gd(*d*q b/ta 7gt $1/4 \; \Omega$. 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 doe/ cw4 hyh96.+fgafe3b nlistr +s;s 1ps 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 uloq mju ,e a3s1)w2de b,x3y0fsed 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 rungw: 0ugffeizowm7;j8,l v /,ws on 110 V. What 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 j,5bx.bm0g lz0qd ,q(st3amqiron for 8.0 hours, if energy costs5b0as(mdt 3lq jx,gmq z0.b,q $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 h0f*z7ip .b3x bd;k ssiours?

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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 con hfhs3pw8z-q7nected to a 120-V line for 2.0 hours. How much heat energy is pros3z 8fq-wp7hh duced?

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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 energs-sfx dl; os*g ovz53e7eu h.)y does the battery store?oldszxgu *s 7 ;-sv.eehf)o53

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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 e; jatsd (y:kkfl g 5uib7dcaa stc/9 ;3rd.96use 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 bul5+1o 6umcoyv smlfx) 0b is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate 1lmox5ms+vo) yfc6 0u 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 hourkx 8w ;- 9hfq*reed+qgs per day. If electric*+kqf 8eh;g wdr- 9eqxity costs 10 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) electric bill included the cost of runqk x3 co *oar(rc)v/p1ning a central air-conditioning unkaq1x o*/3pco rv c(r)it 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?

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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 gener, l30cxdyjn u-n5d *w1m4l zxhates 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 will0d,yncmu3 lx*n45z w x1 j-dlh 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,h rb/evj92yq+v0 9kbjf)ma r 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 costsxr(yxv,pw1t3n* ;e8 dwzheo v/kjs57 $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% h zzf;/lh d6,e2;xvcw6tu k/i q7am)iefficiency. How much current does it draw from a czu fvai/d)w 6lhh;x7mi2q6ke; ,/ zt120-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 currelo:pv vh1a*;g7g v riwqu:); pnt flows through this vi l17h;):wagqv;orvpg up*: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 120m6z4 ee.p q3g zq+p(du-V ac power source. What peak current flows through thisue6de(3p.pg qq+z4 mz 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 sourcvoo2u6zt 31/ wr9gcdye. What is the peak voltagg6 c2tr3ouv1/zy wod9e 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 inch. The maximum safe current it fy7nhv,:yfcv jgl. m9j8)m;ycan carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the d8v vmlhymngfc9y. f:;7,jjy )rift 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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