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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 tram jgk; b-z,)f z:69f rq8p yerawb)aj)nsforming chemical energy into electrical energy is called aamgb pakr )rf y ew9z)8-j; )qz,bjf6:

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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 ,:do.8nmtrw*u3 cwjd:6v jrv that passes through a wire's full cross section at any point per unit of time is referred to aj6w::r jdt*,rvud 3cv m8w.nos

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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 that xf +wyf7.fqs,

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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 ty/o o sfq31uv5 :e0xylhe 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 rated in "amp-hours." This ixhtci: 14umaoh) )( kh yin9 .;1yomgqs 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 define 0uzqwhtf73m:d 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 wirexqnif ;kf.e7is c c4.;8x)(md smd *ez 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+1 f)ai/v6octop1 gy 3vwvv8j wire depends on

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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 lov o ik-:;s)gsvhcj/ m0west 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 pm*y(+y0v,cj u, xjjt other. How do the resistivities of these two wires cox jjvp,jc(y *yt0m ,u+mpare?

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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 x7pp--g -bp;: 0yszzulycp)uther. How do the resistances of thesep7zgsu l-;-yzp:-ppyx0 u bc ) 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-sec7odavgqpwhuh 5 ;x 1v,sqyk4)018(gp detn(ktional area of the other. How do the resistances of these twohpn 4(1t;0(k )dahe q,q 8uxw5skvog7gdpyv1 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 hazy/w ;nezs1//w3wc kis twice the length and twice the cross-sectional area of the other. Howw si;c 3e/w/wzn1y/zk 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 +i) skvy m 8rdi8a2k fnwpb-9:the radius is doubled. By what factor does the resistance changidk kv8wb 2-p) 8ym :+nsiarf9e?

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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 dijyd u)cy:xa. ;trg8h5ameter rod have compared to a 2.0 cm diameter rod of the same length and made of tha:) .y8ry;judhgtx c5e 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 morx6m .k i9tno(fmr w1cwp1vf)c 5-mv. st common metals

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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 resistivznbfly) 2c-aho. :+b xdp 9ss(ity

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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 tokc+o, cab0mey 8wf2op*;lv4j?

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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 equivalyiu*6oup7n, p ent 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 powpp85v:uxc.wf)z-o ov er dissipated by that circv) 8 x.fv-uwp zo:po5cuit 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 yo(xl*y m+ i :uqs4z0f; tyb5 jb9gxu q-j2m3rresistance is doubled, the power dissipated by that circuit wl0qym*r f4;zyubx9+qxmt3 5s:j-yi( j 2g uboill

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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-p yn5yf(nc:zu ./b d buc*+jt, the power dissipated by that circuit willup (. yyjt:bd*5+bfucn-z/n c

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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 c9tbu 8qd ryvt6**u fr.ircuit of constant resistance is doubled, the power dissip6bvr tu9* 8ftur.*yqdated 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%. Bn+v;fu bj1nl*5a2*a+ b dpe aby what percentage is the powervfejal + n *5a1+b;abn 2db*pu 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 n/lnlmo2k4* g 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 curqk)+tn :e8bj grent of 3.0 A. 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 diameter wire +tbn8kjqe) :gis

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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 essenti:. kyh-f 64mc r7kix(ppbef y)ally zero at very low temperatures arei-pf )k7fy kxy.ec6hpbmr:(4 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 of chat bcb.8hys/6 zrge 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 electroplating apparatus in 2.0 min.9h(d*ytf(8tf lwuvq4.tp o25 l.xnsc What is the average t.llh p29s8(.(vu f4t*q o yfx5ctw ndcurrent?

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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 be 0.50h+n;r1zfh+rp5,a4 a u 2tbtup 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 flowio oxb)wsp*ln(r1-)evh,hr0t q;. wwb ng 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 u4dav0s qz3 fx-7+yle 9 k0zfn10 min. What is the net number of electrons that4zz -suq3xn9 f de 0kfal07+yv 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 depo*y2l),dr sy qjsit 40 mg of silver on a metals 2 r*lyq,dj)y 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 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 4.00xj bgnqhz02),nc z+,-aie; qzfdk;* q A to flow through a resistance of 330 Wkfqx)g ni cndbaq2j; z-, zz*0;qe,h+?

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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 b-/h r;rj/3m+n lnizqit 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 1 q hsat3ts1apfsp3wd1788 mm xv5u: u220 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 operatingid)hvtcs9m)3)i9m;bfq;oy2dv:x p r at 110 V draws 1.40 A of current. What is its resistance ; syp3rm2q:ov)9ibht;i vc ) d)mdfx9?

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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 cozgz g8i 6ew ,pgfl-8cucu2+9 onnected to a 100-W resistor. How many electrons flow through the z ,gwzuioc e8g-8pf2g+c6u 9lwire 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.jx)l ei3kla-6j)kj q640 inch? (The resistivity of copper)66ql aj)-jk l j3ikxe 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 resistanceku2. xfs2 j db4y4 (qpc,d9txg of a circular rod 1.0 cm in diameter and 45 m long, if the resicgddbxf2pk2 4.ju 9 s(q ,txy4stivity 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 wj//68 *gvsvjfjpe)m hui 7/ fhire (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 4en wi.-/- ye5d rphip ucjx/cu6w0 x:wire (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. Whadr9. 3ql2teks t 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 9,xb 6;jy7gi6n(zesk kbn2bylong 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery.2 9z bsb(nn6,j g 7by;kkxy6ei (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 rectang.ek giz2j )dd8ular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of copper is k2zgiej d)8 .d$1.68 \times 10^{-8} \Omega \cdot m$)

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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 resistivityt:oj0(ryn yt x 6yg345 z.rmqk 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 copmfh5 6lmog6lzc6f g;)1c x;g :kxct+etg 6a -fper wire (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 resis6rbaiai 06+6,vpshd )hn9enuo 9 fg5ctance 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 re bbvk4-t-8t;yvo ):ll qiom*3 ab raa:sistivity 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 usee: 2 o6p 5ge;jech*f.cvgjoq2d to determine the melting point of indium. The resistance of to qco:*vepeg6 c j f.5h2;ge2jhe platinum wire 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 thub86mkg ar8i1l;f * rzrough 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 1xf pcuwi890 b8200 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 currenzjei6vcgwg9 x9v -ve-9n3 ga fq9/1 tyh2 rd:nt?

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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 used in a 121jbx0,vv d:hr x4o+tt 0-V dbv tvxjt04+ 1rx:, ohcircuit?

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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 r6-6f/xt ppj ky er69htesistance of its heating elemen xp-eyr/f66t6tjp hk9 t?

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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/awu z:uw; *f5-/pgephit bk7 $1/4 \; \Omega$. 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 at x+ltcr3ovqx y8 u7eu)hyx)/ . $1/4 \; \Omega$. 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 it draw?gm938 (:h aqd ton.n ghtl5:yy

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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 is its j 5wwgg8 7j0gfresistance?

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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 onq2 56t/q2k/qs qwdv xy 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 cos( adeh3: u;rpyt to operate a 25-W soldering iron for 8.0 hours, if energy c3:yu ( hperad;osts $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 un-8)1dvw6csask *lt mse 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 hour. -oieob+2tocs. How much heat energy is produced?ioc2 o t.+-eob

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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. How much energy does the battery stores6l6a: 1lk 2ftmnyz3 v 4* l,vhln3ykd?fltnv 6* k:4 ,lvlz3s312aldhnmyy k 6

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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 qrgfep7 +m,i ( bzgl .64kh2oouse 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 the power companzuxb 0f2s*eo2 y charges 10 cents for each kilowatt-hour of elecu*oz2ef02 bxstricity 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 turned on 8.0 hours per dgs1(-;w)k g;kkfj:v kk c /ujday. If electricity costs 10 cents k kkfg(:j;k; u)1ckswd gvj-/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) electrblri 3qx omy/x,yy(scw l 9 o.6h3e+9tic 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 contributowlymh3+3, q t/esoc9x9r yby6.i lx(e 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 anwyzhwf5cj 5,;d generates heat at the rate yjh5 cw;5wfz,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 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 throughf:5ug d qvx6iv ,w*.ev elm/l2 $8.0 \; \Omega$ 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 costs8rhl,jor 8d qgzqx *+3 $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% efficx4o1j bfs(r ,;yt niq8iency. How much current does i1 ,84 ybsfqox( jtirn;t 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 power source. What rms cuza b hht8ax dao;5s,;;rrent flows through this devozh85 ,daa; xb;th s;aice?

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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;-nsp,3bv(a7(g2hiu 0ca q iqhqnb5 p. What peak current flows through t( s 3- h2i7;gqciuva5abhb nnp( q,p0qhis 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 c p0 vp;rn6/.gfehm -lpeak voltage 0nce /6r-fhp.lg m;pv across 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 inch8)klqliqx // m. 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 el/x lilmqkq /8)ectrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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