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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 energy ig9kisuia 7c;:nto electrical energy is callisa 9 ukgci:7;ed 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 passe jitg61 ,d gdn0s9h*co (icq6os through a wire's full cross section at any point per unit of time is referre1q, hj(i ctg*gc6sid90n 6odod 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 thata0spjry0/rmt9h 2b, r

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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 isgk5ree pn)hhkc*- 3d 9a0 osw; the same 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 rateas;.k i, hp+vhd 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 deffdwqrh 0 .80jyined 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 wire i w5 e(5ks- vc5lim8mags

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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 dependwbspa0ujd, cswz97*h* yl 7j 0s on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting materi0vtbx1de6pf,o0kb gc)2m b7t al 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 the other. Howhj)xn cs8 / l(th*u u8:agnc6w do the resistivities of these two *cnn:s 8uh(a gcxu8h)tw/6jl 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 ha.q0k 7lu;b vnet6c9q2p;r3q n,dgimz s twice the length of the other. How do the resistances ofqepg7 rum;q62ldb,nkcvt3n 9. q ;i0z 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 rl6 k/nzz(vq,) qk++hy 9ngpothe cross-sectional area of the other. How do the resistr+, y qo/z+qgnk6v9nlp)kh(zances 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 twiyg; 8sfdw sa/wmb.4i -ce the length and twice the cross-sectional area of the other. How do the resistancesi4ma8fwy sw; g-/bds. 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 the radius is doubled. By what factor d+o1 ;no (m.oyip 9wbvsoes the ybs o(p ;.91o+m onvwiresistance 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 ym/k6 - feuly.va;zui ys5d:: a 2.0 cm diameter rod of the same length andydzyuv;l/: maef- :y is6 .ku5 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 common metalki5nd o.5wngm:,s r)p s

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature7so;cg:oe-lm: lnr9k coefficients 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 mv v.4vszkef-i x w* i/0f5(auto?

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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 b;9z7d2tv)w cebhz1 mhg1wc,lent 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 constankbt+aqd) (9jy t ya,d(t voltage circuit is doubled, the power dissipated by that circuit wib )y+d daaq t,yk((jt9ll

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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 aip ,:gd7ofv(j circuit of constant resistance is doubled, the power diss:iv(odf p7 g,jipated by that 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 wi)n)mgas5 amy h7u:z cg(+k(adth constant current flowing is doubled, the power g57 ns)+g:dza( akum)cya(h mdissipated 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 flowing through a circuit of constan(aj)et. sbo k9t resistance is doubled, the power dissipated by that cjt skaob9(e. )ircuit 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.ugw3 36h c6ermiax1k voltage output is reduced by 5.0%. By what percentage is the power on a rem k a13w6h6r.cei gux3sistor 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 tow9yca nvo./j ; 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. n6wu1si x t1ntb88uh0 One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in the larger dia 8ns1tbun08u 1h 6ixtwmeter 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 zrtfrk,x k apvjf* 94//ero at very low temperatures are referred to f/r 4pa*jfrx/kvt9 k,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 poin3;/yc:/ f qoeeqcbqe* t 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 thx0ku)8 reizzll* g7ig-8evi2rough an electroplating apparatus in 2.0 min. What is- xg88ieivkg0*rzz)l u 2l7ie the average 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 the6ro: k-+jhusi 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 h8pnze 9 3 v:8*)iyevvitqth, 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 A of current, has been left on for 10 minuaqcs/z 4;3x9uja h6n. What is the net number oc6h/ uzxan9 s 3;4jquaf electrons that 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 desired to deposit 400ve)xydi5af f +;v -ooyj;vw. 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 deposit this much silver? (The silver ions are sin-+ojf05afv.oxvy); evyd w i;gly 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 through a re5fzk d u;o8-bnsistanc5bfzk 8;d-nou e 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.mg:-g6:c 7oxv*d keh w62gk na0 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 isr *cez .pnh3)* nuj.d6 kdc lg(ka,oo: connected 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 gkswx r0i; 7b0zuor96.-z0are x:o kz resistancek7s0zx;:9e rb00 o -6rrkgzw xzia.uo?

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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 8n5 -0 c u;tl3+1zrd kb3fdaxt/) w2ik zfmrhqmany electrons flow through a wzd- h 1zc3fq mlt+2 k0ud8 5n)bri;t3kxr/fthe 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 0.4g9/f /ypm3aymm kee660 inch? (The resistivity of cop y mg/km6m/pfe6a9ey3per is $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 aljy,+2; 7pxl e2gfzd+mzae5k circular rod 1.0 cm in diameter and 45 m long, if the resistivit ej z72 ,ya+;mlxl5z dgpe2k+fy 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 (2xtxjdc9m gw9et me-/.,6z4n*q xwsqq t2u7b resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resi2q l qvsoys .ylrk l/et/6;u1i30k 1tkstivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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,u rgja+c3d g(6qkf* o 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 rv7gr7rxa9mb q/y2yert 10d u,adius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity o9qbr 7ey tm70/g2r1x d,r yavuf 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 l+tpog (2cw q3eong and of rectangular cross-section, 1.0 cm x 2.0 cm. What is t +p3q w2tceog(he voltage 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 0o6 9 e28bl(f7f czakb0ipot e2.50 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 w777jpf wb;o v3h8:bsfy . xsqcire (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 resista6 3nf dpa u94c8gyzj /e*si3 djenr3z(nce 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 coefn gaj8frjni4( kr9/gv y3jf- (ficient 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 melting point of indiubu hv a05s 0(mh.prub/m. The resistance of the platinum w./ahsup0r0v 5mbb(h uire 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 rjop; (bdm9 u6$10.0 \; \Omega$ 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 curr1v (3qkh m )swnig/q3kent 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 mule;ahq2ywyh-g, y6f3 ah4z0xn*se y.vgm -5vch 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 nt*8y/etj:m /1 nnpck designed to be used in a 120-V cirk8jyt/tnn/ne :*cp 1m cuit?

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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 +*b ek 8zsk zna2*1 ohii)clfrzd;84q of its heating element*+kil2s 1)ozdhbr; zz8ienq4k*8 fac?

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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 l m3nsk .ssb5nv2lf,c0 5vz;d$1/4 \; \Omega$. 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 rau: zdf v0hkxf7a7nb-5y* +ikyted 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 7wb;zsmmkq8r)kbt 97ewu , e*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 9il ctv 3:q+wy a u.umlu.(/il120 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 its4b(syg 5*lbfr 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 pt3q.c9y8u1 s, plhtk-W soldering iron for 8.0 hours, if energy cost13pu,9c . 8sythk lpqts $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:dy zxtytx c,;vt/v48 xr c3+n 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 q( 3 m3fej9jmcf7o vy*cba;z+qm7dd8 aql, c7 a 120-V line for 2.0 hours. How much heat energy c37q 8av + ojc7cdfmzm d, j9laq*mf3(eyqb;7is 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 and 160 A-h. H1 i/r2hhu ,fkg5*( (suq7f 7kygwhpf aow much energy does the battery store?hf2ghk w51fuf s/ *g7,(i 7p(qhayukr

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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 in 8.0r +f( xip4nos9 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 p f3kxtb-6do2is on 10 hours per day. Assuming the power company chargesp6bf3to- dkx2 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 turn)-t0olj: atcq ed on 8.0 hours per day. If electricity costs 10 cents per kWh, how muchjoqal0-)tt: c 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 cst;a3fklrq ;6 (kk1wtost 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 di(; ka6tsk;rklqw 13ftd 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 o03ym7akxi pt h. 6.f)jw aa)-* nchlnpn 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 will the repair have on th0lp-.f apx7c) jnh)wm3* it k6ya.na he 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 0a910yvu rnd9jp-vzf 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 costx7(8a 4zbv 0 c:8wlbs myd1hlps $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 64mko( 0gka0zq 0% efficiency. How much currenm4qkoa (0 kzg0t 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 connected to a 120-V ac 8maes y;0 ij2tpower source. What rms current flows through thi m jys8i0t2a;es 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 soe/g gg)77bbur urce. What peak current flows through this rb)b7u gg/ge 7device?

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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 conneky06dpdmw-4 v cted to a 120-V ac power source. What is the peak voltage across this devic 64myd0vkw dp-e?

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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 w nrp:y cab( f(dq9c:bjk/wsp-r(k:n2ire is 0.081 inch. The maximum 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 oneb2 nc:a9r(/ p-bcqyj( (kr:fp: wd nks cubic centimeter of copper is $8.5 \times 10^{22}$.)

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