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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 gte 09h(d 1k d de-mrq3ue:g2,1j gaqlchemical energy into electrical energyhrg0ddl3qqg( ea9k 1d2u t,emje g:1- 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 wie o.yah3cv;88g0 dk ufq,l92uh 1wktv re's full cross section at any poin. g98kltv3ca;qf8we v, k uo10d2uhh yt 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 convention current is taken to be the .;b 1it atn*7zv r)ddrvr7ua0k.6hgkdirection 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 saph*vmv-1wr a2me 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-hour by9cj6jh 70z(z dkli1ebr/y3 s." 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 qu1/ * 6-v xqflxxcwt8nad)7lis defined 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 is9txz0hail 1q9

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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 dep 1s(.)q(fqwz30*)uzkoo . dcv6id fwnzzup :yends 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 lowest resistivity val5go/ki.r9z76/yn g h.kof upnue?

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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. How do thebf4si7 *. ocow8f+ ma mcrr(6h resistivities of these two wcr4ms8 acwrif 7*mb+.(oo hf 6ires 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 -- 90 m8/yp5; tv uortn2nrbnhct :eunof the other. How do the resistances of these twop2-:utr9nebm5oy ;tn-nur/hn0 8t c v 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 aav3dl ktln/5(7 sq*qof the other. How do the resistances/3(alatdsnqqk *5lv 7 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 leng,nt i vv02s)qqth and twice the cross-sectional area of the other. How do the resistances of these tv0sqtvi,) qn2wo 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( pzb ud8d3wp 2qi5xil;n4 q,g is doubled. By what factor does the resp 4dgqz u2 wi,5bi3d 8lqp(;xnistance 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 todddu.n/-p9czm m w 7b+ a 2.0 cm diamnmz-9.ud /+wbdc7 pm deter 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 mr.gt( f6qj c.kost 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 re.z2*5w:zn ,y kmax i;iiip,tnsistivity

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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 tom(*mb g1twabq6/y1 vx ?

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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 eg-u h:*/y mbrk7t.cc qquivalent 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 co+1eqm7sm hr5qb:dh 6 cnstant voltage circuit is doubled, the power dissipated q 1bd6hm5ch se7:qr+mby 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 cfv- .ip1/8up .zmdsjxircuit of constant resistance is doubled, the power dissipated b./p.js1 iu-vd x8pmfzy 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 with constant current flowing ic xcz1( r6za/g2vc5j ls doubled, the power dissipated by that(v61j2lr /z c cz5cgxa 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 t/s g1ds9 x.e xxcpx7scss* 5k,hrough a circuit of constant resistance is doubled, the power dissipated by that circ7s p 15x ,/ xkxds9.gcssscex*uit 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 reducd 6;zpidrf v/5ed by 5.0%. By what percentage is the power on a resistor affec; zvd6f/5dirp ted?

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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 respectwbty1u2cp0tu ,f2dj 7w0-b o2yjxrq - 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 a9uaauxlr* mf(vml )j r0o)j5+ current 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 d0 )vmlolu9 j5frj (mx)u+* aariameter 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 resistivirvnfv5hh5 b-p31.rw g ty becomes essentially zero at very low temperatures are re1 vgv-r3 5b.w5fnhrhpferred 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 anwvebv (2dum682 gp2 l1j.ugxg,d j; t 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 appamtxas hfq/r7cy7 - ;7rratus in 2.0 min. What is the amh7s-7 ;tcxr/qrf7 y 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 the current to be 0.50 Ah -p 9pksr6pi,?

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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 ifz(3t d;kevfg5hgft3* $4.0 \times 10^{16} \; electrons$ 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 lefyoksr2)1f 2 0r swir3xt on for 10 min. What is rr3so1 sy x)2wr0ik f2the net number of 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, io7 y;6 j3neztk-pafvvcjz4:6t is desired to deposit 40 mg of silver on a metal part by using a current of 2.0 A. How long must the cz v;po jz ke7j3:f4cnvtay66-urrent 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 requi h cgvv1:.9u4ui8fpgu;1dxu ired to cause 4.00 A to flow through a resistance of 330 g:v9i4uuuif gv8dhp.;x 1cu1 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 thren; 3wx.yj(wa ough 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 acrx. 2e-/ mfvhoshiqle. 40 tvj:tg;p( zoss 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 res:emz9 rc/k3 zffc)-ad istancedz: 9/e- ffkc3)amcrz?

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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 connecte8innt h ,qi98hd to a 100-W resistor. How many electrons flow through the wiih9nq,n8 i8 htre 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.k t0i48nr3o gxr k.r *cpm/ei640 inch? (The resistivity of4kr c3/rm k0g ixtro*ep68 in. copper 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 inyf.g htty 68* 3;gp/km2g babp diameter and 45 m long, if the resistiath/2 g pfy38.pbg m;tg6 *kbyvity 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 (resi u6zf s0e9)laz y+1mfi necj52stivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivityz5 i + dbi1blxyc1iuudu7ej.5 a,f-2n $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 itsv 7bh ,z5 42 ouzjssidruix *r3z/gi*o5+r* xa 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 radius is 0.321 mm) ni41c:9dh 0thqqtmv5ww chrome wire if it is connected to a 12.0-V battery. (The resisq q :hvm5wtd190hc4 twtivity 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 an c(/)k)p3qj mtv1fcw yd of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carrieskc1q 3fc))/(jm tywv p 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 0.50 mm and w .u2tp9iz +hz2wx6tga 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 (resistivitys s y+ hhk:s,e//)b3gt vbfh:v $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resi1v1 mr2:1ivvdua/wmk 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 rear3d-j tpg*w sa-(,xix0 l4pxsistivity 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 indium. d1n g:- uinx o7pdu7w 2mlt+u1The resistance + -7dnpuwmixuon712u1:g td l of the 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 throkiubd1 +r1wp 7ugh 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 r e7t jy15w)zlzated at 1200 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 a;p 7;zn2g1p(gmy/djj 6e cgmcurrent?

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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 erm7kn) 3y94gvuz9j m resistance of a 100-W light bulb designed to be used in a 127vgmzknu 4r9y)m9 3je0-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 is the resistance of its heating elemeneyjl5 -hhy.s9fr hx9.dw9, s lt .fs-lhh sw9d5 9,9 ejy.hyrlx?

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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 wnwa9j4 ;n3 n:ecek ba91kc/qrated 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 rated airszg,ac v/1 4; wj3jz:y*2ztb fg7cyt $1/4 \; \Omega$. 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 /x9cg9yg.ypmh /al p7it 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 15/-o9t,nqk(z euj 7zbdnsm n ;a y4aw+20 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 itsznv* tghsk2pp 28rn:.ax e7o 7 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 solderinz6bu l4qyyv17 lur2d 0g iron for 8.0 hours, if energy costs 6d47rvuz0lquy1y2bl $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 ipb i: i6 vnw1x1yu(z-ln 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. How mucj k :,n7ciazn)h heat energy is:aji,nc7 zn) k 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. How much energy does the buxcnxrp.z 9 *szg ue4 i;)k zq3107zqqattery store?1z* uguxnzpse.z7c;q0z 4q r ixqk39)

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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 8.0 houemx8 14gb oh8fys/tg -rs?

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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 yg;(w)c u oyu.; )cedsthe power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to .y c) s;y(uw;) ucgoedoperate 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 day. If ele d3a,ybo vz;z ,.sq 1ta8mfh(ectricity hsm1.fod,;v 8zt (baey a,3zqcosts 10 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.s muu: 5s-;4.mac5gd ayzt0wk ynwe+al 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 m. +su-wumk:tz5dawsyyc45; an0e g . 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 drier operates on 240 V and l ocdw pmz(;i/9 c3y cu18uzy,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, thelcmz ;91 ,odiy y(p /3z8ucwcu 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 throug vf rtg-u.9m+ch $8.0 \; \Omega$ 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((6 . s e2sehxfgx:xvys $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 h3lk i )awd08bx6 hgh0mas 60% efficiency. How much current does it draw from a 120-V ligmk) 03xlw ahbd68h0ine? ($1 \; hp = 746 \; W$)

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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 currepj5v tn5twn0 ;8.8mwjzi7hfh nt flows throuwim w.fvh0n5t;njt5 h 7 8p8jzgh 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 pu ttenw4b-9 l7ey7ht7eak current flows throuttu77 4-lb9ehy7tnewgh this 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 s6+gco, z; tlb/js r* g8gml(wgource. What is the peak voltage acrorjo( m twb,;+ c*s gz8l6lgg/gss 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 maximum si.lfxkr 0x6w5wp k9*k h qfd,;afe 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 the9fl,*p.5 iqdk r6xh ;f 0kwwkx electrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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