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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://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://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 btcyuv8u18.iggo*wz; (i wqj6ct1 p ;wy transforming chemical energy into electrical u t wy1i6.w *qijc;ovz ptu;8g8g(c1wenergy 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 passes0ob/s9fd w vf* through a wire's full cross section at any point per unit of time is resd9fw v0* bf/oferred 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 conve 2rsozz) nmyj /cpf/78ntion current 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 the same as(fk mmy 9q6ubk 3:5h,vhq o-hqf7ov ;n

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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 is a measure of ti) ;euzgis:xxgh/(z0 heir

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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 1df) ipmn; /hndefined 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 wn -0weq631jg*lo cw zde;iy5jire 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 va*a1wz 2d) mnwire 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 materf5126jhxn pw wial 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 th v4nphb4yx14 ne other. How do the resistivitiesnxb4v p 414nhy 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 t..p)vr ixpvxbwyg e* j(h );wj:f(g(ihe length of the other. How do the resistances o jpeh(v* byg .g: ix(pv;wrj)(xw .fi)f 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-sectionalh25+et uoy,k)reh6tt area of the other. How do the resista+eh ttok2y)r5u th,e6nces 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 twice6*4,xhu.lazy)bc hgk the length and twice the cross-sectional area of the other. How do the resistances of these two wir,) gc4ky 6u.alzx*hbhes 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 what facytgn pqb1la1:1,h9 3g 6uwx bitor does the re,:q 1gigxlt9 1a6ybph 1 b3nwusistance 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 xoyerm p,;e/9cm diameter rod of the same,mr;x9o/ pee y 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 mosdwbq i, degjm17 (h8 ftb(:r5yp;l uh:t 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 coeffi3 nj(2gdwwtx ;s gkg-9cients 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 equivalej py6)pudxm)zrm -t , ,rh:jy/nt 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 .z0,nga mxkp5lent 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 constam pa;kt93n//jn kjqh7nt voltage circuit is doubled, the power dissipated by tha9qkj/a;7hjnm nt/p3 kt 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 6s n(h1mlb. mfa circuit of constant resistance is doubled, the power dissipated by that circui b(nf.mm16h slt 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 floip je6510l o0l ldx7mhu9 2x oqxtkp5:j.k9urwing is doubled, the power dissipated by that circuit will dp: l.upe hj097jxio6o1kl5k xmq9 u x0t5rl2

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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(s/q0 ei0tq +lr6ydmj f constant resistance is doubled, the power dissipated 6 0qe(tsimrdlj0/qy+ 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 outpun5o ymq8q yxvx1k4b.rq22 gx)t is reduced by 5.0%. By what percentage is t4on 1x qy.ybmkrq2xg v58qx2) he 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 sinusoidal with respect to time is referred to as8*+tbvvv 0wutdp +.ggisx +t*y/q0je

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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 carryinv t7ey,:(ny6)hsuqmfrzs/.pu3y m 1ug a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in the lats hm 1.s)( :763z,ym/u y prenfuyuvqrger 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+g,r/*c xe5q 9h1t,wjk qjyzo low temperaturex1+yjjz/t qo9k hq *r ,,5cwges are 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 mgl q :kpja/f,e uhhps0/,)d( 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 through an electroplating apparatus in 2.0 min. W8 *xpvj cidk xa b.knd 0f7214yb8ke.qhat is the average current2 i4 jq*k8vkpe.8d bbxdfkayxc 071n. ?

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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 po6pksrs7bdo v8,a s10z/y nv.lint 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 flowoz rwx/o 87hd:ing 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 Atm8r i:q 3uem6 of current, has been left on for 10 min. What is the net number of electrons that have passe8qum3 r6:eitm d 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 proceyh (1k1ytk+pxi01g b a hhu,w*ss, it is desired to deposit 40 mg of silver on a metal part by uy, 10(hix+y1bw1 htp guakk*hsing 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 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 to flow tqopct9y-y/. n 5-kq:vb eu yx(hrough a resistance of 33n( o-xyvyec-ky:qtqb5p/9 u . 0 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 through ipo:5+vpchk g*t 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 connec c+znpnm:uo3+y q3gebkr+nu;-jpq- 7ztk9 k3ted 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. What is its resistancenf2:*pq 51mq .j*dh3rxhulm c ?n2 .lxj1 m *: hr*uqqc3dhfpm5

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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 m :sfqz-.7 tkczany electrons flow through the wi.7:kq sftc-zzre 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 vp a 43d,bt0i z9c )pqio, mf3epr)2qdcopper wire of diameter 0.40 inch? (The resistivity of cobd3mtei9) 24 p,qz dpafi)qorp3v0c,pper 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.nkys2 ,(t c;gg0 cm in diameter and 45 m long, if the resistck;g g(,tyns2ivity 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 (resistiakhqa4z in;0; vity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (rt2ozgpax 7o ,3esistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, measu7 *dlrzgd 3 5,kfq:pebres 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 0.3oxr a +4cl ze9nlq*vxxhm1,789gom8 pf +s1p n21 mm) nichrome wire if it is connected to a 12.0-V battms,x8*pgq+c pzln149rfhoe o7 x8 + axmvln19ery. (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 lon (e+e/brtsjp;vm hlu,k* kh30g and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of,m/k r*eb ( hhvlts p0uj+;3ke 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 mmplh lht3 ;hu2: 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 wiremrbc5;pv( c: x (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 resis ,hpo:csauo0(tance 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 coefficituhfcpq/8 jj 6ydn0o,x ((anb.,hh7i ent of 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 used to determine.vcj heu-4d (1e1y fn;lkk)v0weoo u 8 the melting point of indium. The resistance of the platinum wirehdv;4)1 yulvew8ncj01k-k(. f eu ooe 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 .0cn( ez6 cf gy+qg u6gaw;de+$10.0 \; \Omega$ 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 :1(pxmkbr .7 fpeth 9irated at 1200 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 current-wup a0l**9g6.wn*zhe v3vn rsmvmz ,0.oscv ?

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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 d zlrd)1 z1dz9pesigned to be used in a 120-V circ1l rz) dzp19zduit?

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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 itsf,dk1fq 0id lb f iqha7;/pi26 heating element6l i0dqbf1d;2kh/aiqp f,fi7?

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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 an m9ntdw 1)gln* jokx.lg((9ct $1/4 \; \Omega$. 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 a-gx+k 9b z/yymt $1/4 \; \Omega$. 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,nyd 9nh* clk.hu1:j2a 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 ,)cik dh+yqwzm3 ft;( ifwu 3-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 resistaw)h3a x zf4.zbj2 w-tw9vc8k,xg /ow znce?

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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 8sti,b2 8 ab7wxxdvom ;( ;suz/.0 hours, if energy coxa b/m 7s(2us;;v,8b dtwoxiz sts $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 hour qi;tg3 qgd c+glfnfp18f,5z9s?

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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 muc. exanbrzy)r 8.w96)uwqnya ffs 7 3v,h heat energy is proa y q3n9fxr8)sa.e,b y w6r) z7wu.nvfduced?

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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 energy4/ k6 ;p/z z 6jozmea)qf-eqe4qfnjy, does the battery store?z6j /qmz -e6qok ey 4fqanj /,f4ez;)p

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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 solderineq 9p1)/pv n3bpvf*es g iron 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 lig wcc(kc dyf9 jp78fo05qd*bpzi 8;cw ,ht bulb is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricit(98jd q*zfw pbik5;cwc8d, o p 7cyc0fy 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 day. If ele2ektan 6a be 030bi fwn3p/3uoctricity costs 10 cents per kWh, how much does it cost to run the computer annt0binuke23/ 3f n0bepa a w3o6ually?

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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 ol8pm9g)iul si; bvwa* 7n8oj 2f 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 these items contribute to the cost of the monthly elecsn8a moi guv8b;ll 27jw9p *i)tric 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 in61lnjla3l1to k(u knspdc;9- an 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 Nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect wtj9 lo; -1psln6lack31n( u dkill 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 throvlzvipsy0+2n4,// n+n uv a jzye w x77+2wdqbugh $8.0 \; \Omega$ 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 costs5c0 ocape- xxhglr63- $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 thy ;h(x-0rwm (pe uigbh 8*x+vre rate of 2.0 hp has 60% efficiency. How much currene *y b8hugvwh-( 0rr+i(;xxp mt 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 con:1jfuq ak*df69 te.sfnected to a 120-V ac power source. What rms current flows through this devf:6 tsajf dfe9*uk .q1ice?

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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 q7gsdnvlk4w9 - 3 vls2120-V ac power source. What peak current flows through this device-k4 wslvsldv973gqn 2?

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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 source. What is the peak volta .bkf5 ybj2 6ka; 4vn .zl.:ezw1mnrqvge across this rw.k1zvzm25n ;.ljb ba. q4nfvyk 6e: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 maxim) uew/ pd:69.h9z dtr jjml;xr*hhdx5um safe current it can carry (in 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 centijdrr6mp9 * 9dhzdxhxj.5lhe;w) t: /umeter of copper is $8.5 \times 10^{22}$.)

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