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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 transforming chemical energy into eleca ti9/- i0qevmec; wsw 88qzv.trical energy is c 9;weaiz-q.m v880/ ivs wcqetalled 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 abvu f+pwc:n 3*9bi gotws 7;s:t any point pbv:b3 *t 7co:s;n+u wg fispw9er 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 direction thafzf6, u3uooer e m*3u2t

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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 t4 bdz7+akbp d:q i76w:kuiv9fhe 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 k6i6c j )tz::tjjzjdzuyc- vz0iu,-(b p/c,wis 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 jq:/ufqm pkq,fws 4r9rz8 /;l5v(smg k51p vlis 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 uknxr (2p g t6v+7tm)xis

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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 jo 1qoa8xys9(5fnkk79fazn8t 6: ygdwire 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 resistivit u ;4,ejmc1nwxy 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 ui+ +5so 4 dpjtlf):nylength of the other. How do the r) p 4fji +sn+tldyu5o:esistivities 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 twice the length of the cu4c-0y2:u n934c8n xtiebr lyip) fc other. How do the resistances of these two wires :2luc4nici34b cytnu - rx09efc8 )pycompare?

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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-se wp(dk;l yz7rnazl;l3s / g7n:ctional area of the other. How d sykwn ;ad;l(rnz/ 7:3 7lgpzlo 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 thy1om(t 588, phjsbew- qxn3c ie cross-sectional area of the other. How do m3 cytnx- 1bwqh 5p8oesji8(, 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 zq lml+ n2+5f ka.3rom 9rb/cnis doubled and the radius is doubled. By what factor does the resislzm/ac9+2bno 5klm nf3.r+rqtance 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 rod have compared to a 2.0 um l7-)c)wtw*8dsfqtcm diameter rod of the same length and made of the same materia8qw* )sc d7f-u lmwtt)l?

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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/d y rkdha(f/hd51b5 hzy q bee73)*kx metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficientsg7+yqk5.vy;yw/cj2lpf 0 gtyl+ xof; 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? gq9,r m28phyc

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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 equivalew odp*kge.4z kx(fs 6x5hi)i.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 constant voltage circuit is doubled, the power dissipated+qqb;2gg2gm2wj ha0w b q0aj wbmwq 2gg22+g;hy 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 cifa(5+o 4 ws5fbqmx8 earcuit of constant resistance is doubled, the power disxa(o 8sfw b+m4aqe55fsipated 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 constantp)aqhxg7ha .qk3 ,pq/ current flowing is doubled, the power dissiphq,qpp3) xak ga7h.q/ated 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 a circuit o-yv8gwq ph m6;cw :.zdf constant resistance is doubled, the power d8.wv q6-;whpymd:g czissipated 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, th*3o:c:8hk6js .s h hma+p dfwae voltage output is reduced by 5.0%. By what percentage is the:jhpmfa * .ko +8w6hc 3ha:sds 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 sin9gips (g hd0clekfmk:m)7a:( /)h fuz usoidal with respect to 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 5(1 c rxvg ok..u.p)t/c*dc2 ka oib0lajkm3 qtwice the diameter of the other. The ratio of the drift velocity in the smaller dia) k5i.uv 1cokmq*(a aj/p2ldo0bk gc3tcx. r.meter 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 vervx-4 x3pe p4+ssurq e2y low temperatures are referred teusv -4 rqe34x+p xp2so 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 poie+ p9/rol j7bznt 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 electroplating a0il +m s8nwc .1 ayoht-k6q9ympparatus in 2.0 min. What is the average cmm0hl+y-ak.nis 896ow tqy c1urrent?

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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 thebf j vrv(-q(p1 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 ifk,85jbh uyf: v $4.0 \times 10^{16} \; electrons$ 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 e;bwoqp6vxo v .,u:o/draws 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have passed tvvb6o.o/x; o: w, peuqhrough 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 :m-an97wor na 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 the atomic nn w-o97mra :aweight 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 flzx)-kyyhh xgo955 axi*uhh 8 +ow through a resistance of 330 W?axkyox 5z9yih +)hxh5h-gu * 8

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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 it is -t(1s gx4 fxrtki;obg4* * xvu5.0 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 current wih0 sh8ywnb5:urmq)+i ll 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 o9lprsts+as2 ) f current. What is its resistance9s2las pt)+sr ?

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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 connecte2fazn vyjhg*f0( p3g2d to a 100-W resistor. How many electrons flow through thfnz0 v2(yj a*gh3pfg2 e 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 diame15ys0 -rpdfjgg eg ps,b1yt6 b2 n1q29)lp gdbter 0.40 inch? (The resistivitgj6n 201dt bbgg,e -rdgyyslpqs 11fpb9 2p5)y of copper 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 pt0rfv ;g(jf v s: ;all/um(o/in diameter and 45 m long, if the resistivi/(fs t (; ;lj:0/vrgauvp oflmty 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 (resistivity *akigec,u6 i) :6txl 1uyn .zs$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resis1yidl9zk o7pgk u6d y:- h2i*ctivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 0.040pzp-,: r; md ) kbshfmxn)4v-a 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 10.0vz;tb j .:z:,z/f pabvu4 jst--m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battera j-b/tfuz::szv ;j4bptz.,v y. (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 cbezu)6 4 1a(xfrregf;qd .ff6m. What is the voltage drop along its length when it carfu;(rfb.xr)efdfqae4 6z g61 ries 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 r k*/nunwcftf*o ,*s) 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 (resistivity awac(-nqkp24ksrn-.$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 ))31oxd qp jrda resistance 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 plato1 76k ;pe0i rgq)o9cvvtl)y tinum 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 m aj;v,i1*3owb- ig(ivp py*pindium. The resistance of the platinum wp*;v3p*vw(ajb1,- yim ig pio ire 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 7k /bgjjrg ,z5an $10.0 \; \Omega$ 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 w -wx h1pw;h g:yew6i(dill 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 run 4okxf53q qdvevpk1/yzx)p2hg7 / 9c hning 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 resistance qjf b8vq6gd7, of a 100-W light bulb designed to be used in a 120-6qvd,fj g8 q7bV 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 fmw dkq o17 4(:jpq1kpis the resistance of its heating elemenk17j:k4 1(dq qoppw mft?

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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 qag77sxwh op4w+ lv8wu;p ;m. $1/4 \; \Omega$. 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 acx ) 0rg:/pkall.7nwft $1/4 \; \Omega$. 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 cudb32kb:ku:p 2x3b ,0vheyi qzrrent 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 qj7v)g c6w(s iits 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.dxgh /s2o::eg 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 z d,a:tl8b6m,av6zj/*lk b k dsoldering iron for 8.0 hours, if energy costzlbz6j m/8aakb,vdt, k* :6ld s $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 lih -i(v4ea9/cy dc l7fbght 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 hours. How much hes f62ee4 uij ,6ffel6nm92zvcat energy is produce zs9e6ue fc ifnev22fjlm466,d?

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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 energr9e3(u0z 8-+q v,zw r3 ucj/tab tlt0jm-hijey does the battery store?- jj+ /e j3qr 9,- (0tiht0leuut vrbzm3ac8wz

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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 6 4qwa*h5 dkskin 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 i95xk.a oyme0f s on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost tooyamfe 05k 9.x 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 ogbt,ba h7n la88l:m/ on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the a8ll8 h,tg:bm/ao 7n bcomputer 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 central air-c; pk-0.oaofp; 88clpnxjq ) kjonditioning unit for8;pnkqf;8. j-0p)l ac jp xook 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 dr/h: inwn8 b/g) 2gbqhtwtf6/ uier operates on 240 V and generates heat at the rate of/n)nwug2htwbhb6 : g fi/qt/ 8 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 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 thro(a7cuuzaapu 7p )/ w18 uq+ytuugh $8.0 \; \Omega$ 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 costs i00:*- ni8s4s x)qkfizxpyb b $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 t09zv 4on 1k1zzbrv4uthe rate of 2.0 hp has 60% efficiency. How much current does it draw frz449kzvvnr1 tzbo 10u om 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 6 3h mn c:0nksekm7bqpa4, y;ba 120-V ac power source. What rms current flows thrak4kp,mnn em b6hc0ybs7q:;3ough 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 source. What pe*cd)amn..;qdr kzs/e7g( zomak current flows through t 7osdga)/d;z q(.mm k.ce*rnzhis 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 cus cd j 3p53lsu5;8lasource. What is the peak voltage across this device? pllc3;5 8suudca j35s

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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 wir 9zrin- 4ya(b0*fam use 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 dfa z s-4yba*90ui(r nmrift 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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