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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 transformaes1yd jz(dzx i1q:ao;s2 e*-ing chemical energy into electrical energy is calledqie*jasz1 eysdxd ;2: o(az 1- 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 bm3v9 ubssp6t).b/,zj mir8x(gv w w8passes through a wire's full cross section at any point per unit of time is refe/ur)v b j38m6z8 .bwts x9i,(g mwbpsvrred 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 cur-mu9d 0nenl*d4 ct.ev,v.wf9/ b bf ztrent is taken to 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 thez3wncob7b.s9 um te a)t we1(9 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 2 hs(rsf;8)q g.qr;so so,pyix - 2uyb"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 wirejuj hfm38a 6 )l9fj4j 1 esrm)y0mt.xi 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 ,psy(2v+vujgi+ f7zgis

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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 7v2oizk lvx i +q0,qe8wire 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 ppton*a:p+z 4cyc98 gresistivity 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 lens11a ( up;omkwgth of the other. How do the resiswa;mkpu(o 1s 1tivities 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 twicev-c)7+q e fdxv the length of the other. How do the resistancefx-qv) evc7+d s 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-sect)i +7k :jbgypw zvc(d1ional area of the other. How do the resistances kzvpbyji 17d : g(w)+cof 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 th8z4qsk 0uvqnv ;fa; .ie cross-sectional area of the other. How do the resistances of these two wirv; u.qz0; fn4vaq8ski es 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 isa sg+7o 3gyms4/ aax)v doubled. By what factor does )gs a73 4oamy/svg+axthe resistance 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 diametx; ,chu m2 sw(,/8c-c+vxewqer* vvet er rod have compared to a 2.0 cm diameter rod oc8 vr veh,s x/;ecvc,quwxt-w2+ e(m *f 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 most common meta.)ge,akc9 c2 t kexeb4nzoh(-ls

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficir g fhu. 7nj t-+*cosfp:,nnq2ents 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 equivalenr oi2) 7+m 9kcon/3uemsi9t gqt 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 equivab45g 0-7bt-qyywhza llent 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 p8m2lfxj; ga nm *v:d u.hxop1qi1i0 5tower dissipated by that ci g:5*am ux8ij 1lv; ot0d1nmfqh.p2xircuit 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 resistance is doubled, thwvn,spdc(lg7(): ypr e power dissiplgv(p ) ,7r:(d spnwycated 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 flop4qwn0zl-b3:mcfpa6 javs p2k 15wk 4wing is doubled, the power dissipated by that circuit wil3: a0526v- pqb4 ksczp4w 1 kpnmawjfll

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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,hkuubmblpg24b5 rx+6j , 9vnf constant resistance is doubled, the power dissivnmk j92r ubp4gxu,,+l b5b6 hpated 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, the voltage output is reduced by 5.0%. Byijde d *u64)lc what percentage is the pec i*)ul4d 6jdower 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 w 9g/)xl(dw zk)aa wk(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/7b 4jvozbx0z current of 3.0 A. One wire has twice thej7b/4vzbzxo0 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 essentially zero at very loc hc1n l((m8i zbju/;ow temperatures are referred to asb u/;cj8 ic1(homl(zn

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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 Chb:mnf u /-lq0,z4q im 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 throug7,/kqd vxdh x/h an electroplating apparatus in 2.0 min. What is the av/7d kqvxh/,dx erage 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 be 0.50*: uf1;i :mst trk7n zpj*d*x9:pdqie A?

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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xxxxxxxxxx，获取更多资料
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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 flowingi . u5m, rzit,)*frkpw 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 10k ;iyzd v )+7vyqbme* ;4anst5 min. What is the net number of electrons that have passed through the coff7+inyva;sb4de5 ; *qkv ztm)yee 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, i/f:f znf34d;cq8dlz gt 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 deposil:fc ;nd4d3zqf / g8zft 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 dljl, 7 nk:a()u upr,bto flow through a resistancupknlbd( jl,) 7:au, re 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 resistor if the current thro(m+2hv,l5q25vnv ahif7 u i oom4kf;pugh 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 current will flow? y3fjr*jfr.9l

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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 is its resistanzx.fun.cs( s )cen.ssu zfc )(x.?

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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. og (eubo4u lnswdut w k423(94c;5adx How many electrons flow through ths 4 ut(gke5aowo44 lx3(nbd;29 wuucd 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 resistancekpoklezt8uz 9pz/v c(r.+ox3tc p0/5 of 1.0 m copper wire of diameter 0.40 inch? (The resistiv .zxtkruop9 ple zock( 5c /+zt3/p80vity 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 cir8e vz3nygv 7*ucular rod 1.0 cm in diameter and 45 m long, if the resistiviygv* zenv78u3 ty 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 (ruusbfdi 1(*,on;bx 6besistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistiviewv)hu0ao-x 3n/)d6b 6 dqzkoty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 it 60oyiw.e,d*jbqj8 be0xc ix 3s 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 is 0.321 mm) g2o .q,wqv)t1d7ujc po+tk -cnichrome wire if it is connected to a 12.0-V battery. (The resistivity of nichrome is,cqv1 ooutp7c+2-tqg )jkw. d $100 \times 10^{-8} \; \Omega \cdot m$.)

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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 rectang3 vkw64 wqgvg+is2bnx83p ox9 ular cross-section, 1.0 cm x 2.0 cm. What is th3wvqi94x2 gbx+ngvowk3s 6p 8e voltage 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 has a radius of 0.50 mm and a o1,ss 6gam1z qresistivity 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 (resistivity3 m/lw5ume6 uk fzqi31 $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resiznq ,3mcb y.n2stance 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 plo5huwf4)je43 ux1l eey- j3atatinum 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 dl9g:rl7-j n),.in rka h)1 b )wbiwqqpoint of indium. The resistance of the platinumkqn n7dhb-w l)r:l ij.)ab gqwi)r,91 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 throu ioan 0kg6sf:- f dyi1od23tb4gh 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 12 e29yg,zini7lyvq/ zk7ecx n 0e/+gs900 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 curren dpqyp 72h )o0/19 oz1v pkelft:p7xfnt?

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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 used5l di/k tex3 4bgwk4z: in a 120-V circuit? :ed34w/kbx5zkgt li4

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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 heati f/+x2oey,rts2nn 8sk ng element?y+f8rn ts/eo2knxs 2,

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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 pxxn/h6 ffq7cd+ p:p(rated 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 rlv; h2/: (x6ps1nqfqd (fhadaated at $1/4 \; \Omega$. 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 curren:tzx1i4sk q57 b/ e quz7g/7 fgmoc5szt 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. m/wj..p 20b6wbwdvyn If it 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. What is its lwxxm-- 1b:fkresistance?

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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 iron for 8.0 hours, imlatx*orea9 f; *wf(e):qa . lf energy cos(aa xa)efe;q* .rlo9ftwl: * mts $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 lightbx0 bauwv o76zc4t74 b 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 muh2 *5xx+e-wutl )v izwch heat energy *+lh-w5tu 2zwiexvx) 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 ene0/3ox0 w/ :jtgiom.z8iw kg bzrgy does the battery store?k0w z0 wzgbg /.i/ooix3:j8mt

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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 8.0az8zcgj-4 mf ers3/k:u bbwc2.. owl/ nd;lz6 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 fznfw/z( 64,-b- j3aqs rr flfis on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour o( faz4ffrb,lr-f-6wqs j3 z n/f 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 t jgnz0t56i9+zs g.zs plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run th0 zn 5 g+t.siztsz6j9ge 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 ix uz*/pe;f4n jncluded 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 thefne* / ;zxjup4se 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 elecbf; 2zie/ *loab;5q ehtric drier operates 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 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 f2ai ;elbe5/z; bq*o hrepair 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 th4d9yi* qcbu 63i z6s xa gft4w-(.dwca pq,ed8rough $8.0 \; \Omega$ 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 cost44n pgyc0f46jewfr2 ks $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 oz(r (eprax3wa pi4938bm zp5work at the rate of 2.0 hp has 60% efficiency. How much current(rp49eapb8iz(rm 3w5z x a o3p does 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 to an.e:li* -zqdnp(;e yc0x6t r r 120-V ac power source. What rms current flows through this ddcqr z i0-pel:rtn x6e(*.y;nevice?

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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 soeai.x.f1x7/zj)x:ab q :vwyi n3u v;aurce. What peak current flows throughx1z)qba; e3:vyu: axfxi.n/jav. w7i 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 8vi.ahbh lq u gc7z/*:mk9zw5 120-V ac power source. What is the peak voltage across this devicq w h *lib8.gzk95/:z7a vmhcue?

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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 saf 4b .kecxbww,(b 7wbf7e current it can carry (i.bb4b 7k,wcx ewfw7b( n 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 copper is $8.5 \times 10^{22}$.)

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