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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://autodiscover.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://autodiscover.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 energy m308phgkw +3uvf2j)+g2ld puwgogn 1into electrical energy 3jo1pu gnwg)kpmug2f2lhv++0w gd8 3 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 wire's full czv wiue+j3e.v,2o7 x mross section at any point per uux ow,i2e+.37vj zmvenit 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 direct8t 3dl 6jo5wp ;8uj*cuyo8mn3/r eblnion 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 xfhax n5ume( twshn 6/n(/81dthe 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 measu upcvw54 , jxfz+8kon.re 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 defig2zmp r guzw-)0nbf);ned 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 if qlk*lj173. z uvavu9 -sgz;hs

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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 w l om6x7,a,cjj0y-j ,r 5zwzrrire 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 the lowest resistivity value?*mb74 mf-jjey q :d(hc

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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 other. w.djjx2 kh31bj w4ih6 How do the resistivities of46wkiwjj dhj1 .hb2x3 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 the other. How l -xou7l1obj94cx*w edo the resistac w-oxxe7b4lo l19 j*unces 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. /k 2jaj2b xkm8 One has twice the cross-sectional area of the other. How do 2bkj8maxj /2 kthe 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 ha,2afiztxi 2m 8s twice the length and twice the cross-sectional area of the otherxitfz 2i2 am,8. 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 ip+ g8imqb 3p 6 xvyu:o3mlxi*r ,l*gxf./0j zxs doubled and the radius is doubled. By what factor does the resis g qlj vx86xu*b gfp:xil30o+y/pr3mzx m*i,.tance 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 k)1+o ev7- bv;ilz+-z8cl/kroku bct 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and made of tuleo-or ;+bt-b7c) l kczvv1i8 z+ /kkhe 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 comm31iprzfr*j 3aw tm4 g )nh)qvl:u8fz6on metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coe+)bm 9xv7:r es*qat oei vmq;+fficients 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?g9zfg yo:0v(6nv,n ff

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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 equival-5nd 9x8 gkdjgent 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 circui: /9ex.lr3*1xnd nib uge5w ttet.a. nt is doubled, the power dissipated by that circuit nei l.ra*n3w dx.tt 9 ebexn5 gt1/u.: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 ofw7zt;ps56l np constant resistance is doubled, the power dissipated by that c5;lps76 nw ptzircuit 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 currentsdpf x39*y*fvhgh5,u5dvx e l(jh+6z flowing is doubled, the power dissipated by that circsh (d+e,*xgzu5h hp3dv6* f9fxyvjl5 uit 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 resistance is doubh7w2 ub x+a7)lb9wbg gled, the power dissipated by that circuit h9u77x)wablw+bg2g b 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 outfhsfq, i. jq5xtlbjc, ;( npb+p8y -5lput is reduced by 5.0%. By what percentage is the power on a resistorjfphb ,lcfqj85 .5(q -p;tliyn+ s,bx 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 u+z) dt+k/jl,da9 * pk/x nhcsreferred 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 twicee+ry n k-xy+ysjhx r78:s: hy7 the diameter of the other. The ratio of the drift velocity in t+ :7+ny:hkr sy xjryse-78xyhhe 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 temperawb :w lnx;t:s9aeb6w6tures are referredw66;b w9 xt ::alesnbw 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 ofuxi uv (ppmg 0dxy6vb+/. k0s, 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 through an e 85bfon*)/rwle4 bsqelectroplating apparatus in 2.0 min. What is the 4f8n eb5rsqb*o el)w/average 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 for the current to p jy:k 2s/fr.1gdd wt9be 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 ifctu8uz a: -n8-oj dfprd+let kdm5;h5) b9u/ e $4.0 \times 10^{16} \; electrons$ 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 1c- y xt7o5gdcikvd:8 gffdz6 x;0re- min. What is the net number of electrons that ha - fdcxc01 kg zgdt5 edo7r;:-6yv8xfive 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 deposit 40 mxxx q79 0.f ioazhnbk7ufl 6-/g 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 arxoa/- bzx9 ff 0 .khq7ul67inxe 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 resistae 2u8gqykx.df ij4cw ()7* vzku6m,j gnce of 330 .8 dkqgcy)i4k *evm 67x(u,jwgufzj2W?

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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 theokudani p)ff:(, 9rfe5) hf3n e1 h7l 7txem5rough 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 is1j:e)ww zu y*hv8+2vq wc qe4tt u:bb, connected 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. What v9 f hsl-4ap, il1epx3is its resistance 13la f-pvxeh9pl4,i s?

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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. ap4ur+w7ybks6qw jt+a6a.- fHow many electrons flow through the wirew-aybaa4f6+6tk r7w spqju . + 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 diamexoo voqoh :;.nmiv98).g gyvd 3:3dntter 0.40 inch? (The resistivity of c3ov:g8.: )dom;gq iooy vtvx3nn9.dh opper 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 45 m g 69xm uwl9yq8d 41xsplong, if thm4sdpxw6x y9ul g189 qe 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 wik 8a9le0sau+n4-xj pjfz15 znre (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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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
教师可以抽题组卷或一键复制本试卷，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
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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 (resistizf.f b3. w7jvmvity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, mejq*5 sg:6 i-m8x p1yvuxg0i arasures 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 gaug52ii .)kgsaebf qx( u-e (the radius is 0.321 mm) nichromeg qi5.xfa(b 2s-ek ui) 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 cm x 2.0 cm.zjo+:h jv nl:k* doz2. What is the voltage drop along its length when it carrihzjv.ok:jd :2+*z nol es 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 has a radius of 0.50 mm and a resistivitx- 7m)g py)jh2 bn6-qxgvv* jey 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 (re)rg8 lebz: 8daep)id 5n 5wn3tsistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 qk9 q885 ienoa$18 \Omega$ 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 owubs+ qgc- t 8+ap*xn5o:60bmnzn9n resistivity 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 theb;k xzx)x4de-c nb,* h ebag+5 melting point of indium. The resistance ,x4-+ *b bz nebgxh)5xak edc;of the platinum 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 thrr r g ks-x9z/7/twg x4k8jqm;kough 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 1fi/83c 6z)7yodey ,/jccez d*1rwq iu 200 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 curre lf 7uyb7wd((+4wgi wwnt?

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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 designmu- -vo(:ij lqtx-i6 fed to be used in a 120-V circu l (m-fxi -v6tjiq:o-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 heating elem( 9ml fsll,-p(8ot-m6wrb2 rk *hnlfa ent?al 8b29f(flrtm kh l-m 6-no ,pl*(srw

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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 ev1bgdq* 8x . pi;-lnkat $1/4 \; \Omega$. 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 abao6r sy t so)a,4lg1b o8gl:2t $1/4 \; \Omega$. 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 idrzb9 h7-g tf-t 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 resis1vy*n 5wk l3sutance?

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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 res.8 1czxo-;k ynyi)p elws -vj- 8*zakristance?

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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-Wjm 0 ve8s zi3si37dx**bwwt5b soldering iron for 8.0 hours, if energy cost 83d bzisme v7xjw5wb*0t*s3is $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 k jp j1gm9*q+mc exo;18.0 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 connvh8o75p m3ffp c,gbx1q 7wqw as)pp+b2 :ts i)ected to a 120-V line for 2.0 hours. How much heat energy is prodqtfbp17m8)25pwsho7cg)aq w+vi p s,f3pxb: uced?

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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 77 i*v*mbao vd ylqn 8;-qjdt3,s cwe:V and 160 A-h. How much energy does the battery store?vi,t;m*c*vld3s-7 d7n y:oj 8qeqbw a

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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 houp)dskl2+7b/ yq z e*vcrs?

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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 ho-oi7fw +og5c +8mujucurs per day. Assuming the power company charges 10 cents for each kilowatt-hour of electr8+u57 ijco fwco+gm-u icity 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) l l 4x1;whbk/qis turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the compuq4kl1;hw xb/lter 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 running a cen67idmxqu* 0aptral 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 contribute6 u i0dmx7q*ap 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 generates heat 0 uh;j)u* fg6q -s 4kqmm*dvhcat 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 thm 6d0cqhjk)g-um s ;u f*v4h*qe 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 througha:0 l 0rjpg;wb $8.0 \; \Omega$ 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 cost: a t4 r1,zjq9:eb. r.jtkfpwws $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 hae :dk72 god( .d,b 82v7rpqg)dcextans 60% efficiency. How much current doct2v,d .g()od ekdx8g7pq n7ebr: 2 ades 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 tohuez*y f+b3z rb *.z1i a 120-V ac power source. What rms current flows throughb*zi*z .hyufz1r3 eb+ 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 sc:hsu6 j. dbi).d:ns source. What peak current flows throug:d6cujnhsi. ) . ssbd:h 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 power source. What is the peak vo- tfdfycv.x4h3rb .bsi y6q07ltage v xfy67idb s.4r tbyf.q-0h3cacross 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 copperhn+oc0uvj-6+z xfpye).v b , t 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 centimeter of coppe,zc n ebt)+0pxuo 6fhvj.+-y vr is $8.5 \times 10^{22}$.)

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