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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://autoconfig.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://autoconfig.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 energywei3kea7 tebj .su*3rkbb;9m gv1 +l. into electrical energy isumg7e bejv b3k.+rbt3e lws.1*i9ka ; 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 wskih ))m2+hbuh8 c0x kire's full cross section at any point per unit of time is reb+ hxs80mh2 c)kuhik )ferred 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 is taken to be the direction trl:y; nh+r:xshat

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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 sam .p),ztzb 2hwme 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 is a measure ofmse6ug90r3y wan r e3 b3me/w0 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 xw( (j3w:t.2z* lgzzpt v +jcldefined 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 wi6 rgkb0ozpzp19j ac --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 depends b8. )t7c+ evts0iw rjcon

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting material has the lowest resistivity hcl374 *ke anavalue?

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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 twicerz1qtw+x* ix: the length of the other. How do the resistivities of these two wires compai1tr+xqzw :x* re?

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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-.m*q w6vkeg p the resistances of these two v km6-wq*e.gp 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 xfdy .tyok1.: wires. One has twice the cross-sectional area of the other. How do the resistances of these xt . 1d:.ykofytwo 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 cr*pxxo,w bh 42p; vle:soss-sectional ax *ps 2wbphx:el4 ,o;vrea of 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 i7kj1hs(uz (-5eivjdj s doubled and the radius is doubled. By what factor does the resistancejjk(d (s ji1v5 7zeuh- 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 8+mjk7q c agimk5d-l, 2.0 cm diameter rod of the same length and made okdg,ai5-lm+ 7mc8 jkqf 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 co b.w4 dgqux+x.yj, 5rvrxm0u /mmon metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature co3n o kqo9x)da mo6pfz(g s :p,,g:k3cbz:vk c;efficients 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 equivalezp1oda y/2g ozt d4e56nt 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 equi5; nxf6xlq/z yvalent 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 voltage circuit is doubled, the power diss w 9 uye42o*qtxgee 43kmb2vh0ipated by that circui vb 4w3 k0oqg*eyu492xhtm2eet 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 double2kdtjx 6)gv;ltld u r cz)u 90zdh(3zuz+4tq (d, the power dissipated by that circuit wig0 u;hx2uqz 3 (tt4rul+dc(9z)jzd 6kd vltz)ll

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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 cx:m f;fsr60nwbz /ce/ircuit with constant current flowing is doubled, the power dissipated f/cw r:0mz ;f/ seb6nxby 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 through a circuit of constant resistance is h 2w*v/eijpu+9 t +gjt2ixc;sdoubled, the power dissipati9v+ us2*g jxw h+/2piecjt; ted 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%. 7sh xev0vgguh- fgr 7,g0 (i5a By what percentage is the power on a resistor affecex fg7 hvi(g0h-aus ,g7r5v 0gted?

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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 sinusoida+x.j 3imalknhna6keln, 48c3l 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 wimcy2bg w 4wf*:re has twice the diameteryfg b2*4cww: m of the 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 lowld;g8t;oxd a; 2 evhz9 temperatures are re2tagld9 eox;h ;8 v;dzferred 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 inb4n. h:ty i7un 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. Wrd* s;q;826w a-dzpr qum ced9hat is the average curesd*wd p8crar udq26- mq9;;zrent?

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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 /htt jjgwd(w3( ;+hee pass by a point 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 flowing -k-xfx4 o+hh qif $4.0 \times 10^{16} \; electrons$ 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 skgh+(k vj4nr s2-ft-on for 10 min. What is the net number of electrons that have passed thrr-(t j+ gk nhk2v4-ssfough 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 on9, ld0ih. hrwbz wmtc -jofigf .ob+47rih- -( 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 silver iom (d -bw .-oihgotw74z-h,cif90ibrl h rjf+.ns 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 )3jwtirzzd 2 py67it+rough a resistance of 3 d3yr6i p)i+2 wt7tzjz30 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 currentllk3 ff (cxw3o1awp,- 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. What current wilhd v(u58o-b09los ewsl 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 0 cq(qqe0mv8*v+v3 wn ti s1ae.q iix5at 110 V draws 1.40 A of current. What is its resistance ieq 5 (wx10q*qa+vct0 3vi.qv isen8m?

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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 many electrons flow throv5u+q kq2ril.ugh thrv k.q+i5qlu2e 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 copjt8kjyxe* jn3 vwq0z (:)z.ywgemk 43per wire of diameter 0.40 inch? (The resistivity of copper i:0(y3 wj ne3.*ztwg x4z jjyq)kmke8vs $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 c3o7w b(vvb++hhq8/fnf /s lamm in diameter and 45 m long, if the resistivityw/v+ vo3bnl(h7f bsa8+/mfhq 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 (r0)0enf.5*7 *jba brg, t kruz:tv rvgsesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resist0gpgbyh f lv;3ya0*e9ivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 ohm3t fvws+f ;i9 ;2kqzwts. 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 gau j gsn+tzo o334m-2nl fdz;sl,ge (the radius is 0.321 mm) nichrome wire if it is connected to a 14nsfd;+g n33o- z tljso2mlz, 2.0-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 crof51uyi oabm5k t/ c/(fss-section, 1.0 cm x 2.0 cm. What is the voltage drop/b51kio5 tu / caffmy( 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 ra0vyaq e,rfh93m-wx.b5vl z3 gdius 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 (resfksrrm1uh+**u a neo,v,g q;)istivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resista.ps-unog6;e7jky yd v*k(2h n bm; pz8nce 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 coefficientkl;rcf sgxc 5hl/--1t 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 the melm j/esd2km89i k5(k qwting point of indium. The resistance of the platinum wire is/8ekj(k59 mis2m kdq w $2.000 \; \Omega$ 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 throug hh./w):xtw: a 3k:6s raasf,.rrbselh an $10.0 \; \Omega$ 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 120iqxj)c*+l dlt6-c rtjq,r 6pobe2d3: 0 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 n/x4ka+f 3.dvxoigr 7 on 110 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 10s4)7pe/p )9p-grou yk; gqilm0-W light bulb designed to be used in a 120-V circug l -7 ;s)i)94ypuperpmoqkg/it?

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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 th6nlj tqs (cc0.e resistance of its heating element? .j qsnl6(c0tc

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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 *7x;a uetvviyj( qb ;.xkz 7-q14 glin$1/4 \; \Omega$. 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 j s5 1vh,9qc rqu.c.kfbd:wn8t $1/4 \; \Omega$. 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 r owa*ca5gcbkg513 kn.gy, v3used 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 by,.r;e/ub40 bs ;*htzhsr+sxs0x lq 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. Wf)s qwt)5p 4gmd1m4juhat 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 solderinglg r0nq-6uw/ 8kubuh: iron for 8.0 hours, if energy cosgr:qu8- 6u0hlbnku w /ts $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 usepnvk. a)hv td:5-/rtugeb ro33mo8v 9eoun () 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 linewyji0z8+j) v n for 2.0 hours. How much heat energy is produce +0zvji)nj8wy d?

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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 ao83d:7.v m;nxu mfhkot 12 V and 160 A-h. How much energy does the battery store?: 7.udx3mmhvnok; f o8

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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 i /;s9ryh((6qq fpc nwvron 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 10k :yi bth 3vcm2g+h4x* hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annc :3xtiyvhmh2 b gk4+*ual 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) isb yew1,+ obuz4 yp0pd7*r+wzq turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it 17+pe + ybbq*4r, wozw0zudpy 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 runzpvm39o42cg) pvl, ;x dt yww-ning a central air-conditioning unit for 2.0 hr/d9mygvxt vpo-3 d;l wzpc2w 4,)ay 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 electric dri+kll-1, et7nef q66 kt ippt6ber 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%. tn6l6p-tl6b e,ieqfpt71k k+ (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 flow fxaykt*u6 3y1s through $8.0 \; \Omega$ 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 costsgz 1lsbp; p;inp.ri,+ $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 60% efficiency. How mov6h.amta :orl (+2 veuch current does it draw from a 120-horv o:am6e+a(v2l. t 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 conn c:.jxk;/ 664kv07 c8bllmdpqqcgb roected to a 120-V ac power source. What rms current flows througqcl kdblbjm6cq p4r6.;x0 7c: 8/kvgoh 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 source. What 7luce9bbws 9: peak current flows through this d9wlb 7ceb:9u sevice?

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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.,bz;;eo w*qsm+6 3okkdizs,b What is the peak voltage across this s*, ,kbkzo 6die qzbos3+;m;wdevice?

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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 current it cf(g ft3 z/7(eacr f9ltan 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 centimeter(l/f3tfgazr(c9 fte7 of copper is $8.5 \times 10^{22}$.)

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