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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 by transforming chemical energy intorlamwg by kh0* * 0pc4use6f8k,+ s(jp electrical enb(4k eck ,0prsulf+08 wpmg*hays j*6 ergy 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 through a wire's full cross sectb6a;g(;y-ca* ; bbl3sig drc ml,8 lorion at any (c;6rambblo ll ,*-y da;s;cg grb8i3point per 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 convents0d.zbx /-d0+bniz qsion 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 ca7w304hk xhxas

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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 theirnwskx*)o*iusb,ncm4d kd72 ywc3 5k (

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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 aq k1ytfjb)xtqv5 2 -uj4z /lesn8*os.s

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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 is / fmz4-ge+e)rym4 trl

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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 depends2*ie4o/s2u3fcfja ;tfvp,wy yi(3 ez on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting materi qy 1co9q1 h;hiqbw3t17: ozm6e gq7dhal 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 thexzk:s(/n z+6jd b0gzv4u l*es other. How do the resisku+ 6db lgz:0vz *j enx4/(ssztivities 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 the length of the other. How do the -7rvd4k* ,vtc/q jrb6e*nrynu /g8iz resistances on7btc/r6j iye qrn d4gv vurz-* k,/*8f 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 a:3yd x l7b*q1fqdhnyb/s 50 txrea of the other. How do the resistances0sfld: ydnyb371 q5 h*/tqbxx 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 an. u/tvhz4)h hu sn0y*gd twice the cross-sectional area of the other. How do the resistances of/.tuyv hg*sz4hhu0n ) 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 *h2w 1gg8ji1lbjs0xg doubled and the radius is doubled. By what factor does the resista2wihb1l1 jg0xgs j8g *nce 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 +u(-ew2v7ghzuwqvbc4 c w0g7 have compared to a 2.0 cm diameter rod of the same length and made of thegv b4g(v7 zh27wc u +w0uc-wqe 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 common metalsnhao p-qmsg2 7 8xz7bnm,xxli ;q94a4

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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 re2wgafstjv+p h,j*nu27/o0/ r fcd5nesistivity

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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 tox/ /zoi)t1rko qyl (w)lto4h-?

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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 eqzqk44l v+b5 kpu4v ix/ /qr(dzuivalent 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 a5m g4oz gfsi6/ constant voltage circuit is doubled, the power dissipatedg/m54zi6o gsf by that 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 a circuit of constant resistance is doubled, the powerfh*o6a1-fyv7ig9m 2 jk z n+;cxngue 7 dissipated by that circuij1iy 9xf+kn* 77- ofn;2gg6 h zemvauct 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 is doubled, 7+a /y-ogiw huthe power dissipated by that cirihoyg+ -a/ 7uwcuit 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 constant resistance is /ir5vtuzm+ttmi .v, 0doubled, the power dis t+zr mm.uivtv,/0t5 isipated 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 pero c fp lln0*e+sie+o*7gw7wg 0centage is the power on a resistor acw*f el0s i 07+poglno+*ew7gffected?

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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 a t)fmw xwc5(se:z,ii1i j7 t-rs

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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 has twica))qno+u .fl ze the diameter of the other. The ratio of the drift vefo) uq)a n.z+llocity 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 t+as6(a wqiml8vw y)w) emperatures are ref6mla+i )wq aws)(yv8 werred 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 0.32n7 j a no0c43jsupzs7k v9,r*+v ekqw0 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 minua/0is- 4op sp9lj2fg. What is the averaglifja o249 gus/ p0-spe 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 b0 v ccf8:c5qxge 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 l / vj jg-9etlq;)n6b*7pn ei ,rsjbl- dwm:2o$4.0 \times 10^{16} \; electrons$ 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 r8vd/ 7tqhg,vleft on for 10 min. What is the net number of electrons that have passed throughvd7qv8 th/ ,gr 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 on a me8gags pgl6n0vxh 49r 2tal part by using a current of 2.0 A. How long must the current be allowed to run to deposit a sg6ggvp908 nlx4hr2this 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 th w+ro.:)p bbqo8ld5l91xb oirrough a resistanlxwrlo)db+r o9 :p5qb.18i boce 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 a 5.0-W resistor if the current through it is 5.0 .aqw3x9rg;h y kob1.p 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 acrosspz rp+8e(2wrm 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 resista1ry duvgkqsh*c-/ -:y z6co :h0z0fionce? dovs0ukhz*z rh g i16 cc/f:0-yo:y-q

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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 t+5ve.qu36w3:ad3n f oz nivmco a 100-W resistor. How many electrons flow through the wi +m3 6fzn3:wui dq nvecoav.53re 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 1.0b+9 vo7aexm )1w edoj4 m copper wire of diameter 0.40 inch? (The resistivity of copper ijw9 ve1ea4)7d bomo+xs $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resistanci-+x.n dktltlb4kzf m0s5*1me of a circular rod 1.0 cm in diameter and 45 m long, if the resisti.41mltzdb5k xi nf 0-sk*lm +tvity 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 (res3 s,*7qzxne ppm7o)bl qds38o istivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (r p6l8g46lk whxf *qf:oesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 res*o5aov,3- 0hdybhgo .fykip .istivity?

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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 radiuw,9 btsd d)4shs is 0.321 mm) nichrome wire if it is connected to a 1 sd4,9wb dh)ts2.0-V battery. (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 crhkaa .: dxrdn5t7o :h5oss-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 400055nk.:7addta hoxh:r 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 resiskq1px 6a,va -6qn zj*sfe,o *ptivity 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 (resistivit3z8 lzd m8+9 dytp 3w-skdx9tr/ylfw)y $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resi: :llg mo7otexrm458y qau:j/stance 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 resistivialc5fu9 un .0yty 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 the melt vbq1nxm8o8h8r1c5 6sb 3xi rxing point of indium. The resistance of the platinum wire is rbv cxh 8 sn1386rm1biqo85 xx$2.000 \; \Omega$ 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 t vt i-ipg,e37:p(qgrndw-j5$10.0 \; \Omega$ 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 cus,w72 pplkh/ orrent 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 draws0vkzjou84,sw lav xpv0;v 6;m 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 light bulb dep*r r*r,m aobf .5rwlm -w 1qn3:fb69tocu/ac signed to be used in a 120-V circuit?ar1fm/pf5r,q: .*rmbu tanblc -6cw ro3wo*9

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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. What4*f e68kluptf is the resistance of its heating element?4lfkt ue*8p6f

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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 0 v86cg0a+r y ke elxxja41rh;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 rat,jq7orkiei8 g /s:5(jmu. e eoed 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.f x hza 4iaq02zk,d1s: If it 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 c6 cph q6 +inb9t0xkikt2tti7x9ltz2g3+l:a. If 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 on 110 V.o+-arw+okyjyu8a9; qjxs.xi. rs f5da;jm 7( 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 solderyc)6.mphk efs5rtog6*x 5x*fm-5hr q ing iron for 8.0 hours, if energy costhf6)om s.pxe6x 5r5-yrmg* fqc *5khts $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 li;m q)uuw a)*i6pgo +mgght 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. rlh5 39txww+ iHow much heat energhiwlx5 +r9w3t y 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 ahb0-amggt q0 d rw: 93p/ti i-mixo8l:nd 160 A-h. How much energy does the battery store?qgtr-ba0gh0ito:i d 8m3-l mwi9/xp:

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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 solderin ut6+5s)0/f5 iuyr v fphfd 73+7gcyl2bvjud sg 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 day. Assuming tr;c13tz5ls v,u- ibvthe power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to;z5vrvt 1t,ilc -ubs3 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 x)4 vs u74tw4e sqkba4per day. If electricity costs 1 s4)4xk74tqv4ebu a sw0 cents per kWh, 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) electric bill included the cost of running a centr,b+oi 74 ;jp6 ovj/wa2eyjp odal air-conditioning unit for 4/pjj;yp od6 vjaw, oe+o2bi72.0 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 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 e *ba8x cya/1ljlectric 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 owne 8aya bc1jxl*/r 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 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 througml8 0wgf p0rr,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 cost pse)4tn5 nr,kooh,/os $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.xli* ga 9;a9psgq 3a0h0 hp has 60% efficiency. How much current does it draw from a 120xg9igqa* ;s 9al3ph a0-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 connec ivec orx g)d+a8,eh59 s6pgo)ted to a 120-V ac power source. What rms current flows thr) g,aehopcex5 d)o i rs+6g98vough 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,xvi7w8netxua 0v3 6 u 120-V ac power source. What peak current flows through thu 0,w8 exv7xniu 6tv3ais 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 xg ,p lsu8 qn571jkmu+to a 120-V ac power source. What is the peak voltage across this devilmsu ,uj 8q5 k7ngp1+xce?

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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 maximum safe ct -c k4fuol5-zv7 *zlpurrent 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 7zzf-4op lk tcl*uv- 5of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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