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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 enecqjo1gu c)i9:imhr0sfl v *4m5 0p0hergy into electrical eneru0r9 ci1 qh4 5l:0po c)jvimsef0h *gmgy 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 passnm a-pgi hw5;..twbh 1es through a wire's full cross section at any point per unit of time is referrw b-mw hp1nh;5ai. t.ged 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 bellzth5ry (fxc9 8jy b60kb91o 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 same asc6 4qz(s0gih o8l80gefa ysnw 9 j5)3no5s qpy

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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." T9d g wca:mvqv38y0f 3p+9flhqhis 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 defined-.j-a kxaqbw( 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 wij t.54jyyj g-* pjahv-re is

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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 cvc ,*u5(ult,.dy6 xsira su( (g:aoa 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 resistivitkpa9s*k:mi 1 ay 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 length of the other. Hz(xhy bqm.n jit 7s7kc1m8s xkr1s047ow do the resistivities of these two wist 1qrjximb1. s 07 8kmc7yzk7hsn(x4res 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 (s6 n v ddal;t9j.-:pt fs.jvslength of the other. How do the resi.d(sl .:f9 dtpv sa snv6j-jt;stances 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 wiresr /(lmsc15rs 6zp fzh+. One has twice the cross-sectional area of the other. How do the resi6p zr chm+s r(z15fls/stances 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 the cr:dxj9 xq eh.7toss-sectional area of the other. Hotexjh79: .xqd w 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 is doubled. By wsa9z5: qz(waa.r62qw9 ii. pc +blarfhat factor does a qfwa 9wza5(i l9cr q r:bpa.+6sz.2ithe 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 dia,; q9;oybm.rt:sebzd meter rod have compared to a 2.0 cm diameter rod of thzbq :o ;;t e.9byrmd,se 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 mo4y: :n1v,zw h omi2bmbst 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 coefficients of resistive) oy/9actbk / i13nurity

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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 tb17jw z zw ,68c5fcwsyo?

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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 equivalent td5t,) ep z:l hnkl.hu7o

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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 coar9+p: g d ye..s+yxnonstant voltage circuit is doubled, the power dissipated by that circ:g+o.rys + nx9 pya.deuit 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 circ*o3ot ocpi2g5ubk0b l* f,wz)uit of constant resistance is doubled, the power dissipated by thz20,ot c3k*gw po*f oi5bbul)at 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 flowingl( pd1sb29rky is doubled, the power dissipated by thrbk ys(1d92pl at 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 corf2 bqnipb89 fn m)0d2te9qg3nstant resistance is doubled, the power dissipatef ip3q92nb)nf20 e rq89gdm btd 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%. By what percenty0z4em*.c3nb3 fl :xr icv+r jage is the power on a resistorjl0f+i b.rycr x vcz3 :3enm4* 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 rpj zw+ qeu)tt:-y,7gtime 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 m+bmtjq 6;;+ ebep);qn jc8zt of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire ; j pq6+)qeb bje;mm+ztct;8nto 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 tem,zi-)cqes-xj peratures are-j)ic ,- zqxse referred 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 flowi ms hu2)s8 c(r/rnssp9ng if 0.67 C 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 pass)q pb8*qb8kh w(myp 27zgly:kes through an electroplating apparatus in 2.0 min. What is the average curr 8ky )m w8zqby7p*kq2lh:(pgbent?

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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 p oa 4;cd)ur+auoint 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 flowing ko e+1th3y+n:d nkf 1dif $4.0 \times 10^{16} \; electrons$ 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 f1 (bgjzliko+1 or 10 min. What is the net number of electrons that hg iz(1l1bjk+ oave 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 xpdhi0x b,g;;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 silvb;i ,pxd;h0g xer 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.u k. y c4a9:7mdvjb;n.ffqzs3 3skfb9 00 A to flow through a resistance of 33kmys b9. zjfb ucf4k ;v3937 nqdf:a.s0 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 csubx1z v0y5h 3urrent 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 220 V. What current will flow?tg25 aow xl08i

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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 cj7yb p1gjx9) kurrent. What is its resistance7x)bp g9yk jj1?

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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 electkl uyn9b/7jf .;i(w5 atkx -dkrons flow throug.kay kwkjd -(95f7/ li;nbtxu h the 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.n)znb oaz1u o; ,7 tm8yhj:o)q0 m copper wire of diameter 0.40 inch? (The resistivity of copper isjn;q 8z:o b oot7uzm,ayn))h1 $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 cire x+ vgf;azz10cular rod 1.0 cm in diameter and 45 m long, if the resistivity isxa vfge; +z01z $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 d:akzwi6t axh)h )2 )h$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivdmz+ b,8lxkoc: :9nvoity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, 4.0ky:ypwk289w wo, em3mo2u g5s 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 a 10.0-m long 22 gauge (the radiity4s3b f4gmv:d uxvwx5d7zk g.7t*; us is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resis4k xd 5bg.ut m:gy *itv 4vxd;7f3zw7stivity 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 o:nmu1167qji7c8 t tnbm3gehc f rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it car1t 77mucq1 ti8b:jmcen 3nhg6ries 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 07fp g hr;g.*vai: gl;j.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 coppezy/so867d bvkvxi ++s gha7 r8r 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 re3qbzd; s*nfq4o7d)zn7hg rq4sistance 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 p xra5djsw/9 h9latinum 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 usehe/z l 4- c;u)qodepw7n(w2fhd to determine the melting point of indium. The resistanchnhue27c /(eoqf)wwl4 d ;-pze 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 throughfme7r6;)*knaj (du t t 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 will it drawo 91 / 9aede.wf5/kbvjb9j70abj oxj t?

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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 curredmn2)7z,ngpjj i31gui+ 7hnp nt?

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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 resiprp.ia * ik86ixk44k otie,zmo,+5ejstance of a 100-W light bulb designed to be used in a 120-V circuim* tz+ikrpxkp , iekai,48e4j5 oi.o6t?

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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 elzrlw /1bi ;eul-1eh :zement?i e-r 1 wh;:1e/zlbzul

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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 rat-p+ 7tu uw fgtez**tf2ed 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.dfwscfr (o 26 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 useqlj z. /inat/la y)+;inse 8+m5tn: itd 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 usj:o+0y k:s.c )wdumb fed 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 b7 4 tdg8ut9jh5emmn;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 ixf1y fs4n*oq st04w8c ron for 8.0 hours, if energy coss4 w40*tfqxfs yn1c 8ots $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 v/vtb;srg b4h(14b dn100-W light 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 mu zsjs4 /zsh7em k hnfpw9/fw(*k(4x+aw vw7h:ch heat energy isnfv47wh kw/:f*zs wswm+px eh9k 7j4 a(( /zsh 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 energy does the bjjv+94)zadd6tc1 tnvattery store?t +9nvzjd16jatvcd) 4

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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 hour+w*rhufnf)xvqiy5z/6+2 z+fhc h3tgs?

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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 light6k d;qf6d:c l gtrdx16 bulb is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual d 6dl6fgrqk ;x:t6 1dccost 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 mo2fvyla.g 9 6banitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost y gvaa 9blf2.6to 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 c/md0 *z+ lxfhfost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W/d0 *xfh+zmfl 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 generates f4yd/h9;(gf gfqd.s* zgp a7p 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 zg g(fspgd7dah y;*9.fp /q4fis 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 flowsh5uk c96t z:yq 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 costuh/z+xb w*x q( aoa af+o-ty94fd:(d as $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 wor.f: mgkv 5r.mnk at the rate of 2.0 hp has 60% efficiency. How much current does it draw from a 120m.rgf:mnk .5v-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 flowsalb8( h 5 2k)gu nwr,uiy)4j97zrtg pj through this devl)hr2jpy ktguz5w,rjn(iua8 749 gb)ice?

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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 peak currebp /bwho.3i9 a5t p3habt51bvnt flows through this de b 5a15t3atbb/po h9pvi.w3bhvice?

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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 connecte/5hom,uzs 0sgd 4k k7wd to a 120-V ac power source. What is the peak voltage across thi/osus 54,zkw0h d7mgk s 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 maximumt,c97wd+w u zbi6f+p t6roehl2i3 8ul safe current it can carry (in order to prevent fire danger in building construction) w6+eltp6btc 7z82lhio 3diu wr+ 9uf,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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