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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://5edu.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://5edu.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: admin  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 chemicay on3v 5;4 bpftxy8j;hl energy into electrical energy is called 8p 4t; ybyf5;njx3vho 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 ct)w+h;m(4 plq g.irc eharge that passes through a wire's full cross section at any point per unit of time is pt+r(il w he)g.c;4m qreferred 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 currw.:cc:-g5+q y; f zk-ihiyuipent 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 hczsci +*. kzmn/ z:)lthe 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 idmrsn s -,k50lh+y+ hks 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 wimt+98 p9p f9gm +wsil0gkpb.bre 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 wiymj g9nez 6w),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 detjz)q,d+:ws3+n kka;kg*k mx7,i2j ;euh dvb pends on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting matoel0o6lixtje ( ck ;)4erial has the lowest resistivity 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. y(dfmveg0cw e7sp r/+ ( b/ 1vsyys5-sHow do the resistivities of thes/7dg fey1rcy5 y(vsev +ws- 0p sb(sm/e 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 lengttw*p cx6iqd0-po sr( 1h of the other. How do the resistancerq6o1- c0 tp pwisdx(*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-sectional area oznrzzjg) 10gtp7z;b5f the other. How do the resistances of these 1 gnzzbzz57prt)g ;j0 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 ty0v1vi,c wv6 cross-sectional area of the other. How do the resistances of these two vc ,vt1 vyi06wwires 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.qrwv;cleb+ i;3i e5+ c By what factor does the resis+3e+ie;qr wc; ilcvb5 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 resistancm aug*c u*(j,h8hh06m chb6sse does a 1.0 cm diameter rod have compared to a 2.0 cm diam*u ubm8h(sah 0 mg6 jhhc6,sc*eter rod of 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 comm ddzclypc)+.lct u/j9a c72-lon metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficie4grrf4 g3j n0bnts 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 t)7bt5;izjcoz 7tpv3/f va2kjz 060 / gdmkbbto?

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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 equiv ywmjy-;) f2rnalent 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 voltb 4mxp8xj*fe*za6ievop k:, 7 age circuit is doubled, the power dissipated by that ci:x,7oz**j pae vk46mpbix 8 fercuit 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 conpmo5j0hf -d z( fjs0;vstant resistance is doubled, the power dissipated by that c pfs0 (0h;jdmj-5fov zircuit 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 flowing isx9ld4y z3a(e b.l nxk,.vf(q s doubled, the power dissipated blk.d, bz3lqvyfsanx4 9( .ex(y 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 th8 1hdn; 7a2kct cq0mxmr+ tzc+rough a circuit of constant resistance is doubled, the power dissipated by that circh x;c 8r +ztkn1mtcmqd02c7+auit 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 voltaa p91f kox(sp4ge output is reduced by 5.0%. By what percentage is the power o1oa9xpfpk(4 s n 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 sinusoidahvu/bb*tas1 8yg g:dn6fp7+il 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 wirpd1mys; (nw)5z qg fz/*irg:me has twice the diameter of the other. The ratio of the drift velocity in the sm qn g;1zw s)z5f/y(md:prgim*aller 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 becomev/zip8l6gst2 11ohtu hsj 2;d8v ldb *s essentially zero at very low temperatures are bt1hz ;v1uvs6d8j*l8 2p/slth oidg2 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 flowing if 0.67 C of charge pass a ps.3uxo lzj* *k*d2v p ,vk.oyzx,5lzzoint 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 apparatus in 2.0 min. l + . qs7hm bu ;hy;9vqadfbgk.9/9dvk What is tk79;;d bvh /dm ybag f v.l9.qkuh9+qshe 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 thepati)5 qvz jz8pgt 6g gr+s7+- 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 flowingiyt3 lq+58itw 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 l5px k65hx3xntdfk3 :ye;;jtbhl g/41l(d g zleft on for 10 min. What is the net tnxk:/e 5 py(k16xd g35fzl4;;dhlljxt bh3gnumber 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 4qv sd 9li 39.j,0xombbgaa65g0 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 silve3qs9vb g o096xbagm ,5laj.i dr 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-v+q )-4u;qenckn a mo 4.00 A to flow through a resistance of mv4eunkq-o ca )-q+;n330 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 ahio ;ku8qv.* d+3gcgcurrent 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 com2m )t8er ntz;nnected 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. Wwbi 8/0rm(sqt3; ac cehat is its resistanceqae ci(c8t 0/ws;rb3m?

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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 resisteo s6f6m ;uoqm i quzgsww6-q n/:r8//or. How many electrons flow through tfo ;q u6uzq8 qos/w 6re- 6:nsi/mwmg/he 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 resistanc ; ii,nii)gp.tb0e3ly e of 1.0 m copper wire of diameter 0.40 inch? (The resistivl )0giep 3iiy .bnt,;iity 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 , i2 2wag,jlxvcircular rod 1.0 cm in diameter and 45 m long, if the resivj, w,il2x2ga stivity 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 copperm0 scoxu , +yn3bp 5:a3gv:sry wire (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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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 120-m long copper wire (resistivityx c rm0iwrm,e+ 771 uqosu1gx 88o7vfe $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, meut9 dm/+uog o( 86ejpq -j;j9lqxe+opasures 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 radius is 023y;smr zs;ky h+z*b h.321 mm) nichrome wire if it is connected to a 12.0-V brs;s;+k yh* m3 z2ybzhattery. (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 8 c 6vy(sjbz1ox 2.0 cm. What is (1 6vjbzsyoc8the 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 rad)maqd*c)4gdxc pj, )yius 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 copper wire (resistivit iy+mby2 ;nf9uy $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 hacf jyo j6/;ud3s a 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 oac,x)i 1ntuw )f 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 usy-;s -7 xvb 1fe(yxrajczk :2xed to determine the melting point of indium. The resistance of the2vy7 z-cbf;(1a jxryx :xk-se 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 through an rhe3yi58pf80f xfo q8 $10.0 \; \Omega$ 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 wil/v x:(kzmcwo mde0q yu6(o5(kl 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 113q/ c 6zbl ;m5d5vvv8czmvco 90 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 of a 10 e.hn ,muti;3j0-W light bulb designed to be used in a 120-V ci 3i;huej.m, tnrcuit?

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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 th0x)t b ml ettux8rbk0u (k82z+e resistance of its heating element?82 t+ t8rl0b) tzx0( kkuubexm

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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 +i65c; b jz;dupce h7q$1/4 \; \Omega$. 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 raf ab dk;xe spa)2zx)8ai j6:0ln;af,ated 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 itmhgs7,inq eo3 b+6blqc:*e. m 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 iijm(2ej( i tj8s 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. W */8q ys2vp6;ixegz; sgy t,:flzhdv5hat 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 k w7j,amy a562nxmk7ssoldering iron for 8.0 hours, if energy cost xk7n mj5asyk w67m2,as $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 hours?o9onw7 48 *k;nwb 7pxnbhx+toz (y)ft

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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 conne8jw0dfn(:r vocted to a 120-V line for 2.0 hours. How much heat energy is projwd8 0vronf( :duced?

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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.brr7a wiw:. i9 How much energy does the battery store?b w ri.i:a7rw9

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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 c3i;sq9xfqgstd 14 y6 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 per day. Assuminij1 *kk*efpo-;i ie9eg the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annuapei k9o1e**ji ke i-f;l 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 monito 3tesm /oko7y ;q(* mi0qg/pcxr) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost totq;m/i xcm/ epy*0s 7 o3goqk( 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 running a central air-c wb*;wage-e8 honditioning 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 contribute to the cost ;wg-* ebhe w8aof 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 anl j. ,unbmk,hi ( idk9f18q:fera/4xf electric 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 Nichromejfaiq.4kufx(ne1 mrf/: ,b 8lihd,9k 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 throug/vck)1m.c j -zd3qffpb+j( ml h $8.0 \; \Omega$ 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 4t y+dobw9o.f ah+ m,e$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 o-a :gqo irns8d0l 8q-qf 2.0 hp has 60% efficiency. How much current doe 8n:-iqa0qsrgld-8 qos 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 a 120-V ac power sour3og), hei vh4 q,ezbn-ce. What rms current flows through this device 4-beg vq, hei,3zno)h?

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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 pea1dy r (q.m m2t,:jubvqk current flows throug1bru:mq,my . qt(j2dv 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 n0zct:1 vg5k2xi4kld to a 120-V ac power source. What is the peak voltage acrtkz 5 nkl1idc: g42xv0oss 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 copper wire istw/5xd0 -z j,t 4jdevf 0.081 inch. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. Ad-5 t xwz,j0fe jtv/d4t 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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