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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 transformpvtw in pj(rdzd*0 236ing chemical energy into electrical energy is call rdiv( j6*p0nwdpz 32ted 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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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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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 w2l zsj(86lh vtv2t6. rnsuf(m8h d8jany (h shr l8dvj6.t6(us8mj8 2n vltw zf2point 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 tm mnu /pnqp *wigm)5(5o 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 the s*cppqqo/b vik -e12-eame 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 : knzvtt4 e:a)q0h kvzssd a2xj50,9x in "amp-hours." This is 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 is defi89ukq ) 3rmtpsned 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 is4orlxr; h 4md /2zjuo8

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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 dep6 )adipfd.dg j:as3 a51g4a dkends 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 vat;. t: 2o-bjvywd +fuelue?

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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 lengt/ub xmvpa 20zv.420p mkomdh,h of the other. How do the resistivities of these twovdk/mp2042 0pmm.,oah xb zuv 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 tw6 /r ,p)a.1 gexoqeytvice the length of the other. How do the resistances of t qpvext/1 roge.)ya 6,hese 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-sectih0/ xc+(g2i rha wkjf1--ezsdonal area of the other. g+-0dc hesz/hi-1akrw(j f x 2How do 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 so4l 2ohgo5 ,60s)ttg ff+sbdhas twice the length and twice the cross-sectional area of hdfs6tsl otg )4+0b ,5os2 ogfthe 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 radius m9gmf0hv:ek tg o 2l(.is doubled. By what factor does the resistan9e gvk flgmh.0tm 2(:oce 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.bl(kmcee:9 v rod have compared to a 2.0 cm diameter rod of the same lenml ce :.b(e9vkgth 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 most c4h ds wxavz 8f8/e+g-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 coefficient5r m 3 eq33ht70ko9gd y.qzvcms 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 equivalent2 ;ea./j f18n, oxoasra8vs )ha3kpuj to?

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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 equiva 6p(kqa c1mx1 szlk92xlent 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 power7j 1yjtyr,,g m dissipated by tjrgj1 y7m,,tyhat 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 i5ck vvauu/7t.e09 udji6 mts35yx3b circuit of constant resistance is doubled, the power dissipated by that circuit willxuam k y .e/u 3i639575tv0dustijv bc

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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 *u+:c n)gptigcircuit with constant current flowing is doubled, the power dissipated by thatp*:tngi uc) +g 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 of constas.qd)wq(x /m8y1b ) kcm9beyvnt resistance is doubled, the power dissipated by that cirmbe/9c ms1yqb )).wyv(8dq xkcuit 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 5.0%. 4 :apll mvq6/(7xexxzue50r iBy what percentage is lr (5x ial4zqu0em7v/x: xpe 6the 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 sinq qjfyk)uw.p92dz6 6haa5 qu 8usoidal 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. Ona9g-fhq 1aklw59 op+kv-uu o 1e wire has twice t5al k+gk 9pqoa-v uw1fuo h-19he diameter of 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 essentifn niges3g8h(pi*p. p9)ly a+ally zero at very low temperatures are regi p.ip+enf hy83*)n9glsa( p ferred 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 4n2/ge+q 7u wwtgmv7a 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 t*v .yw6gcw9u:ep* bvr;j fi4through an electroplating apparatus in 2.0 min. What is the averaiywv uevw* ; pb.r:j*f94t6gcge 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 pointyd+e l3t6p0tk 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 flowing6 q5ignojsu-c -sk: a( 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 13.5 A of current, has been left on for q/f76vonf t+xd d)a3 o10 min. What is the net numq /fdxt6+a 3ovodf 7n)ber 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 deposit 40 mg of silver 47iey0.s:gj/2xvo1jhme tss t( 9gznon a metal part by using a currenti 4(e sh7n g9os: jm210tzetjysv ./xg 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 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( ly n8kb6esl: is required to cause 4.00 A to flow through a resistance osl8ek (:by6n lf 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 them5art; y,*y0h7sj lszofim n2+9h3znsmb -i7 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 220sgu x kx ssr/54d-.bdu3:a(x v 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 draw++i rrw3 fohhmj*+ is;s 1.40 A of current. What is its resistancejh+r 3s +o*mihwi;f r+?

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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 fln,efk6jz i5g9(ya6 m gow through the wirgj95 g6,zfiky(6mn aee 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 ig9t c9rchhw/,tp 7k5. e -ishnnch? (The resistivity c-hh9rwse9 .,p7/nhit5 gk tcof 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 in diameter and 45 m longf4o1m)pu9n(i v ipjx,, if the resist,4p(iv omj 9 1nui)xpfivity 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 (revch; kx)4:xa;-b*:u wtzygau 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 w- n+k4kpsu w3(m4bmj2 ck3wzwire (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.v 5 uu namg)t; +45t eh,pzmlgap(/k)k0 m long, measures 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 js3 rps: kr269xe l:hp;(rc-p+ drijma 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome 3j:drrcrp2: i96hj -emp(pxsrk s;l +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 cros;x3uw +o tfc)9u1ha j2qbhy/is-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? f/w1bx+uchh9tu 2oqa3j;i)y (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 radiu*)6px a ; e3aojbk;gess 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 coao2:fdi1 btxafv;/,t xr// zr c2l7t spper wire (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 resistvz qzm4a n2,o)ance 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 res+xy 01zq m4acjistivity 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. s ca0p)xi o e3fkffcy8**vnj*2*rf4 b The resistance of the platinco3yr i f*f*sjeanpkv) 28b0*x* f4cfum 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 throusk0ui09iafd bqe5 1 c- bxi,r8pg.uz3gh 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 curren ik(t2) jdt;tmhq ucy3);xr+nt 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 a,(ugm j,)cq nkenbaf-12(lt 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 li; ,1tkda 46g7gr1mz w0t gebnkght bulb designed to be used in a 120-V circuik t gwta1g7 nz4gbr,me6d0;k1 t?

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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 ejl-czs1qy v6 okywt )i 1q5tp/ki/+ ;alement?iy /+v 16ot)lsiaqt5kcw/k 1;y -j qzp

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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 rate d+ -hblyd3ywqqb ka9)v(9c 6vd 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 ar(b*dt4ng(5 b 0c i3u rkzs9iat $1/4 \; \Omega$. 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 it draff*qit w3ra6(,yjsf( w?

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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;o3 pc/r,gmd7rnko b, is used 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 runs on 110 V. Wha o.).biwgb ql4t 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-kg w n8bhzp1(2W soldering iron for 8.0 hours, if energy costgb1khnw(8 z p2s $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 hoursy6 hs(rlqos 12v tkvui- 2ub6()pxl3s ?

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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 yia: 5 1dv0nvn fr7ts:2.0 hours. How much heat energy is produc 5s:710:v vfinay tdrned?

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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 the 3 ( qv.dz1d h1+holmfobattery store?1 3+ lfvmq1hdh(.ozod

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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 irovwkf// q(n+4qi 1 litjn 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 pe.2oir aru+ vs;r day. Assuming the power company charges 10 cents for each kilowatt-o 2iu;a.r s+rvhour of electricity 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) is turned on 8.0 hours per ,ew(w1: bpd+iw hpmcqtreq.:;zk/3sday. If electricity costs 10 cents3i/k mw:1:h,(wpeze.+ t c ;qpwrbdqs 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,y 6hvx1h s98tzftbkp maz3.( 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 vbz( x3,6.fhmh98sp yt1z takthese 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 a,lrjxqn67shk r767 fzz 4ss1240 V and generates heat at the rate of 2.1 kW. The heating element shorts out and, in repai kfqra6zlsr7 ,njz7 6ss41 7hxring 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 through y bb*)b 5f)whz$8.0 \; \Omega$ 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 ,7 dge 6diinlau.o/f6$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 hqcw t6(6,ugqj (;.qtjrm ik8 lgk/9ckas 60% efficiency. How much current does it drilgg(qw(m k jju8tctk/k 66r; q9q.,caw 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 rms current flowuqq/o) .be,v b,fae7ng1om rpi(hy *9s through )q. bbpno hufma9(qe, gvyro1*/i,7 ethis 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. Wh0)o/0i db yeovvg2)tznoy5ng p :u:3yat peak current flows through thiv:oub:)0zyonygeon pid0 yv 5 32)g/ts 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 pow3h o6o*q+5mp u s9zppder source. What is the peak voltage across thh sm*d 9oqpo65zp3p +uis 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. 6qmah i+tl 3/(brim-w The maximum safe current it can carry (in order to prevent fire danger / wiq3i+blma(6-thrm 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 copper is $8.5 \times 10^{22}$.)

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