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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://autodiscover.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://autodiscover.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 chemical energy into f0v 2/apcw 9iqelectrical energy is called ap9 w faq/2ci0v

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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 passes through a wire's full crosflxwm- *:5cegpb)k(w l k 4rhu-r+i1roo5a3zs section at any point p1):h-wlz45proo u rrc 5k lebfa*ikg 3w(x +-mer 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 ,aj-4k lqm yw4is 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 sameai;) 4crzk*du 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-houi xd6 c*e3k17*bsx 2ljlu0voa rs." 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 defined zgu2lz2.o 7y 76cx2jd.y wox las

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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 g bjt as5(clx(e:w+xf z6/jr5bmm 0d 0is

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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 dep+h2v h6dghu1rymn*rbp3 2ue)ny4 ty .ends on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting mater /*lse( kttej/uys o818wi7 hhial 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 wirs lww:b :xev-4es. One has twice the length of the other. How do the resistivities of these t:- l4:sv wxewbwo 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 length of the o*glb; gba 4 cw/c(ps ysb6067xrk:rlsther. How do the resistances of these two wires sycrb(cs6/:l7 rx ;kl*w pg4ab60sbg 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 5vd9fwrinpd2*h. s 7z twice the cross-sectional area of the other. How do the resistances 7ihz nd.* w95pfvsrd2of 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. 1uy fqv8i1zx1 One has twice the length and twice the cross-sectional area of xiv1fz1q8y 1u the 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 x wpci-il,yjl;yxby2 2ce5+2 the radius is doubled. By what factor does the resistance chany cx yy5+;l 2,2ep lbwi-i2jxcge?

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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 diamete+nh.qh;dpnz .9wenxwkytc57 )( kcvr( 1s pj ;r rod have compared to a 2.0 cm diameter rod of the same length and made of the same materiaqpw+.;) ; .vknpzcj7c 1de 9nx(y5h(srwnk htl?

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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 commonl(nl p :9l3slwri /us*vv,g(i metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficient77rks9zhs o+ats4 v/fs 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 o dwl 6 qqp+(q*r ypsygc,s)*4to?

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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 equivalenty f -j 0hdd0kv lm.st(*u6qlz6 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 voltagezknv6krd3:kw:*g l -m circuit is doubled, the power dissipated by that cirzkg-w3*mk lv:kd:n 6rcuit 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, the power dcet ke6ya.o5f*l-5, h zs4crkissipated by that circuit ck a5-s,e6yl kf 5hzt4oe*cr. 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 flo,sdws3grv84ju2*7d g xerg6wwing is doubled, the power ug, 6rs3wwd82x4eggj sr*dv7 dissipated by 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 flowingy:en )u9c cjzhq9 b-,k through a circuit of constant resistance is doubled, the power dissipated by tqeykjb9u :cn) h- cz9,hat 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 r.yhxcqs(0n/ what percentage is the powxs.cr(0 /y qhner 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 respectwg jpc /-s7 n4kvc.ir9 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 wire haqthc ja9nh+(,xb y/:h s twice the diameter of they: 9n( xj+t,bhhhqa/ c 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 low tep1zwevc6m k1:kx,i(vxcj+ v k2 ++xhm mperatures are referrez(:x+kk khc,x wm+v6+ xv1m1p2ce ivj d 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 point in 0.30 b* 7a 49gqtrl wj*j63hncv,zas?

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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. What is7fu:dul /1b so qd0fo+ the average currdfou :/0d 1sq +ubof7lent?

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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 9 c/q 6qtq45 xawuvz4cg 7f7pato 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 if ts,u n rzl:am 82i, ejcvvc457$4.0 \times 10^{16} \; electrons$ 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 10 min. Whaed 2d -4-wuvnnt is the net number of electrons that have passedenu-dvw 2n4-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 process, it is desired to deposit 40 mg of silver u pm:k5mhq8x4(vr15x4ijxf s on a metal part by using a currenur:5 ixjq5p84kvxm(4m x1h f st 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 diffei vfd0a/ve vy h,)wi9)rence is required to cause 4.00 A to flow through a resistance i,/)dvf 0)evvhiy9aw 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 ar8o y0fbjn-/c) 1q-fapbw20p ns y*e7+n fq ar 5.0-W resistor if the 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 22pk6c*e 8 :zt ;ctxpw(x0 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 1a*f8o7jl( ,7pd rwcqkw +ic3s.40 A of current. What is its resistance7ri(f 87*+ d pw, qakcwl3oscj?

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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 resistoro(t1l lnh,zuo: 18qx q. How many electrons flow through theu(,o1 :t8 ox1nq zllqh 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 1.0 m copper wire of diameter 0.40 a-ya;x x)l9etd+lc;dinch? (The resistivity of copper is -lxaad t)+cdl9xe; ;y $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 l+ *fimc;l54ytvipq 2 zong, if th*vc 2tlfyi+4pm; zqi5e resistivity 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 (resist(xoklgowd9 (ztxnn. f+927q-/ujc +cj3w emh ivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivity :nquw - -ty*vj$1.68 \times 10^{-8} \; \Omega \cdot m$) 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. m+2 .(l ldj h2:bztq6(3ffayq;kr zgy 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 radius6) hffrr )s3o t(olbu5 is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. o )r(ruft6fhbslo 53) (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 rect k5e13rpix :yvangular cross-section, 1.0 cm x 2.0 cm. What is the voe3 k :xvr5p1iyltage 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 g 3y hjbyndn7;2cz be4f1t:0nresistivity 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 mu5djc- trl(66ppda zf lbdy (1a;:.gwire (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 fl p;kboxua/3qr1*4y 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 of resistivity -iu -0qwhhlfu b3)+zyof 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 determiny l(my)ewe0gk37qz5i e the melting point of indium. The resistance of the platinum wire ek e5gz3yq)i0m7ylw(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 nti0ga va4a.. djwr.1an $10.0 \; \Omega$ 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 1 hu43t7j g vbw :-m/iqt:i1dd 85oopup200 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 currentti qef,2 lvatkn 3- md:wrxv2mpvc3z*rt3; )7 ?

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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 usedri8n )0m 5el;bzv,fzn in a 120-V circuit?vb)lmrf5 z;niez 8n0,

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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 rc8n7cahnsnun;)m : 08 z oige,esistance of its heating element?o8nim angs7c0;n: un)cz, h 8e

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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 a3o84 pva /oj hp f8/+axo5emvdt $1/4 \; \Omega$. 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 ywhyt j4xx95tt5u he+m0 -kw5 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 current does itopbj t zi4,fg0yf;u ac23jhz*i80 ,ra 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 ab,1q ,xcdxs.wvl 0kf*t 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 resistfh40 9bvqi8x, kh bjb6ance?

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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 cos dueq,,,et )kut to operate a 25-W soldering iron for 8.0 hours, if energy qd,te u,ue ,)kcosts $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.oba rxc1/k+3e1v 2diyo w4-tl0 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 l) mcdp q gr5xq um/ih8c/l3o(+ine for 2.0 hours. How much heat energy /5xim8(pqqhud3 gcmc/+ro l) 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 z j0j 0r3r7z e3ia/;jxj25f cvdk(r hrV and 160 A-h. How much energy does the battery store?c /e;5v iaj0 3rrxf0jd3(rzjz7jkr 2h

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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 solder(;.gds f-/t 8v mlewhaing 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 light bulb is on 10 hours per k ( a;fnd4ql9gday. Assuming the power company charges(nfa4 dl ;gq9k 10 cents for each kilowatt-hour 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 turnecuogn,n* s:4 ndpf 7-jd on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the compgo7j n*,-4:up nsdnc futer 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 co-kcj l82qbhjf6 /gf 9lst 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./9 hfb q8jcl -kj2fl6g0 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 heatlp i9ktr)at;6 pjl;0u( p8nun 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 u r;lt(;jka9 6 )p upinnptl0u8nchanged. 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 thr j+o dpe9bc:g)hfb* 2ni0ty,oough $8.0 \; \Omega$ 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 costsqd:kpfh ;u49 d $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 has. c*/;qm6k dmapc2lbe8 2jl rirx.*ex 60% efficiency. How much current does it draw from a 120- a i *;lp22.rxer6.mjmbeq *cdx/c8lkV 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 curredlk6yb7,s-wud+( sevx3 dwe/nt flows through lvx3 /w,swyd6s7e- d ke+u(bdthis 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 b0ttr oj( 4 d+po7k1c nqp:,jmpower source. What peak current flows through this device4j1 t(j+ 0 c:qbp dtmrk,7oopn?

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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 conneci f:0h: izxoeey j)7/wybs 17yted to a 120-V ac power source. What is the peak voltage across tfei j/7hyywi1 so)0 z: y7:ebxhis 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 maxf 0/ .q 0owi9rycdamr(imum safe current it can carry (in.co9f0( wr/im dqrya0 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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