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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*i0o0 p6k 62kwc znqbb electricity by transforming chemical energy into electrical e0k o2n6ki c6 wpb*0bzqnergy 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 passes throu/k v jje du(i/2y.,vbkiev; h2gh a wire's full cross section at any point (vd;2byiveu.k/i k/ j2 ev, jhper 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 conven5 )aepjg*e;m wyj3y( ution 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 s85r/dm m tc6osame 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 ratewf; w;bpc6t *ld in "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 wire is del2;i)kqlgt 4 ol9tl 0jfined 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 ey z d 3eqskfd.3wbb.0s*6 m3uwire 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 depends oa a9-pkv.v w6gn

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting materia-l8 c*lts 5owe 2 f)tr:lpggllh ds1-*l 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. Od q5hbmp d/c0e ;-0wacne has twice the length of the other. How do the resistivities of these two wires compc0w; 0-5eqad/bhmdpc are?

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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. -(p d /msy:flfio; ,gn One has twice the length of the other. How do the resistances of these mdf/;ly:s -(ogifp n, 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 of the other 1jcj;yc8,fnp. How do the resistances of these two cc; y1j,fpn8jwires 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 cross-v6yc5r bw 6mzcv8hl/skb 2/j-sectional area of the other. How do the resistances of these twocrh-6 m8 lk 6cb/bvs/vwjz5y2 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 doubled6 -ogma t/oe9lzx9/vn and the radius is doubled. By what factor does the r m/vao-e9z g69n o/ltxesistance 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 an2m+g edb9d- s 2.0 cm diamedmed+ g 9snb-2ter 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 commtzdo a./p0lu de3n(ir79 hs7yon metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coeffismi2 u0*:c)u.1s k gkitmd,xkcients 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 to?8ymjmb6 co)fqtagkzd,7 ; x28

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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 tdw.v// j srj;h/* bkjdo

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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 ic*)b aekp +p0jly )u1fs doubled, the power dissipated by that circuit wi 1lpfe+*cu)kyjbp) 0all

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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 dy0ee-t j z,s*xoubled, the power dissipated by thatt-e eyzxjs* ,0 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 wi8 vdta1ckj;zy-z9n+v 9mkp(w th constant current flowing is doubled, the power dissipated by (8avckd;+ ztwyk nzp 9- mjv91that 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 c: 5ql yf3njr*6cduy;through a circuit of constant resistance is doubled, the power dissipated by thrdy3cfu c6q:;n*l5y jat 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%,y* f 6zrzs40wj:wlfum1,yiv . By what percentage is the power on :l6ry1*wmf,zys40u,vz iwjfa 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 tin68,hk cva6w zme 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 3ux0:(:v sxy38yko luw.0 A. One wire has twice the diameter of th(:y3sluwkxv8ox0: uy e 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 essent/wip*sl5gc4 4 j sba/bially zero at very low temperatures arel 54/ as cpi/j4bwsg*b 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 ofv kv uqsgi:/b17 ;j9pn 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 through an electroplatinghx i++8h c5)0my (1 a4tqxp kxxlbg.im apparatus in 2.0 min. What is the average.cik5x +m8tpi( +gh lbxhxq41 0)mxay 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 rejg8e-m)b 1pbe 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 if6jp : 40+rpkxupt b437ym ettg $4.0 \times 10^{16} \; electrons$ 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 minc retcq5969l m. What is the net number of electrons 59tce mq9rlc 6that 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 depgyx2 9 i62p+d tl+ 2,;iunfsjznz,rfsired 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 de 2n,udig+,n2ltriy;zpsf2x p +6fzj 9posit 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 requir /gbvdqm(v)j 2ed to cause 4.00 A to flow through a resistance of 3d/vg)j 2(bmv q30 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 acrotv,5f4 bcr laj/3 n;rwss a 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 220 V.hlu2;dx0zyri18vo) iysuf/ ( 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 drawdy *b *cg80un q(xj1eos 1.40 A of current. What is its resistance? gbu * *x0ecyo(q8n1dj

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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. Hwjh62 pie*3,+yj n nvxc,c z7g pyi0m3ow many electrons flow through7 j +n2g,myipc *0ejwy,h vc36pxn3 iz 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 1.0 m copper wire of diameter 0.40 inch? gs3ist1h ;jf72ncn*stx a;w9 (The resistivity of ;scs7 tfaw9ni1gn h tjs3*2;xcopper 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 1.0 cm 0/opv9v9bmgmv4 ft9.6fl d,m,sizda in diameter and 45 m long, if the resistivity ivp o0 9m9 ,lvi d,mm6dtfvsg/.4b fz9as $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 (resisti2b/h4 ,-*4nha sjvk+tp86lc5 lz cmjtfh:l ojvity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 wie,w h gfkel23;re (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 its resistivi;s:ru. 0tggvgb0cy c5p;*iu- 6gd oxpty?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the current throvls/q57d*l fuc 4 yik5ugh a 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resicl5qkf s74iv/y*dul 5 stivity 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 rectangul* ,jiztjst,d; ar cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistis*;, t,zitjdj vity 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 radiur .1k yy4*1gdzfu,wk ls 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 (resistiv7rcm0rgp 0sgn95 ux+b .q zpvwf32g7w ity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 haten(b cm0he e4nk)3 ,bs 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 of platin c 0rel s3 z 6yvnv4xg-3 .gq3d8v)iq,opmtoa/um 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 melti(c9 s /ochffw sx54is3ng point of indium. The resistance of the platinum wire ixs s(/chw f 3ocf9i5s4s $2.000 \; \Omega$ 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 ayn29l vhggof s,w,c8zv 7/3aa n $10.0 \; \Omega$ 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. Wha: ah/v ur7tm)yi2o h2ni9(kcbt 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 z7gak*7 olul xtig4jf x: )/8udymbfmt06 19sV 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 100-W li- vthm fe b31jvr:+7xh 0jnv7lght bulb designed to be used in a 1203v- rj +x0lmeftj 7n7vbv1 hh:-V circuit?

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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 ial4c ys4 :(jmtr,t d/aunt,. ms the resistance of its heating element? drml y m/t(n .,ta44ucs:taj,

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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 rateft;ajz 81njs f:rbvg3uj6 *x4d 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 ratt:, x;xo vhe5zed 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 twg4 xibx1wnu.*( d;d 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 6g 3-kpq2g(l0pbylxafu- - hr 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 *x3m1bj w1 u.og:wcmm on 110 V. What 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 soldering iron for 8.0 hours, p;wf va+5/ qgx,bg5y aef n--sif energy costsy;a pnsf+f5- gwqb /5e-gv,xa $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.gs*imlp41v6yt mbc3o m. 0x2d0 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 much heak-cvy ;v gw j0pr,i9xox+y c3z8 i/b:wt energygxpr: ixoc 8j3,yizck ;wy+0b-w9 v/v 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 t6s*ic otve65k i6:*+zyaugiand 160 A-h. How much energy does the battery store?zv 5k*y6te6:i scuo gii*t 6a+

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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 z. wqm4.fw kiid,/h 6g cpcc27in 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. Assuming the power companye. 6 zyok bux46i rynoz2ml,5iy*y0j8 cha68nj6xro kbzouyl*.me0 i5 y4y z iy,2rges 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 turnedkga 11xdtr /kq3j rp(;5(jm0fe6c ji j on 8.0 hours per day. If electricity costs 10 cents per kWh,p6(j 0j3 kd; j5a tcf (jqr/r1kg1imxe how much does it cost to 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) ele 7cj-vvn+ 2vb5o4 ra*bj 0pblzctric bill included 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 these items contribute to the cost of the monthly electric bill if electricity costs 8.0 cents pe*b7v2 +- lp0covbn5 bjajzr 4vr 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 7*hc,jc* 4iyooy9pjcheat 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 repair cj9 yo *hj7pcio,y*4chave 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 throughsd vsi6(e1of;avo7pe p4f* 6g $8.0 \; \Omega$ 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 /ya*,zo0 vcibo a/7aw /i8cuj$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 2h)q.*.xdy vagdyeid 9k7xlt6/8 p f 2j.0 hp has 60% efficiency. How much current does it draw d7f tij8.dxvlk2yy*) ax/pd6e h. 9qgfrom 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 poyd.a +yk-e h*p7f5.oer (ff)fi i5mvk wer source. What rms current flows througym y f-kdie()* fre.hkofv .fiap5+57h this 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 power sou foi7kw2xn51s ct1r.trce. What peak current flows through tho s71fnrc. 2x tk51witis 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 120-V ac power source. What is the h*pwwqr(6:lg1v+ ,m; f 3ez e;xzfujf peak voltage auf wgzef,j;re+l (*: 3mhzw v1qpfx6;cross 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 is 0.081 inch. The mi e5+ jte2td, cj0-a qjn1e3roaximum safe current it can carry (in order to prevent fire danger in building construction) isi1te-eq,j5daj +r02ne 3jcot 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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