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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 tr3o+xt oquj 3)eck 0cr5gb9inff cwj8x9b0 4h3ansforming chemical energy into electrical energy is caqxf t 3bb0i499f c+keg 0o3j5ourhnx8c3wc )jlled 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 toqy r8qkk: 0f+hrough a wire's full cross section at any point per unit of time is referred tor0yq o q+f8:kk 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 convetw*mdv/l1 *hfp yhm; j6 jhlllb-r1:,ntion 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 sqts-bc 1 p4b0mame 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 of thej85inyw y (gr)ir

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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 is634menxkkxts.gp . zx )o9u qk.be07pqh *t5y 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 wi l)/0 ys6ab mdlyi3l(wre 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 depeny4tx2845 elmh g z8mrjds 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 resistivik tr0 /n)wpw*m )ucs9pyyr12y + )fwmvty 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. How do the r g1t ;rw:bscco:wzd 1o0mr9:aesistivities of these two wires compare?zbr:d1ag:1oc:c ;rw otsmw0 9

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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. Onez-on 5r5a649drvzfpg k4,ef j has twice the length of the other. How do the resistances of these two wirjp4f4nk ef a9o,gr5d5- zvz6r es 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 tw5.mqvpkff06 ul al d26ice the cross-sectional area of the other. How do the resistances of these two wires comk5v6qflf du a.lp02 m6pare?

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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 0n-r24 ardobmth and twice the cross-sectional area of the other. Ho0d-b2r 4 monraw 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 thv0v 27/far:z vu 1chqje radius is doubled. By what factor does the resistance chan:arf 2jhq01u z7v/vcvge?

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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 diq9qwgiljs*crs 2m hj:0, o 5:dh6vy )cameter rod have compared to a 2.0 cm diameter rod of the hscd c)y r,hgqm9q sv*:56w:i j loj20same 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 most common / (*j4qjb,*exan czc5 m9pden +ezz h(metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature v+ js66cb ca8bt-x- w:lelf:s 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-xd lcxh),ml( 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 equivaeg;j.dxo.z 8alent 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 isxrm -k:2sv d-66vju,2bsgdd t doubled, the power dissipated by that circ6md2rbk -d -sd g2uxvvt6js:,uit 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 i.16gk yon xf; lx.anj1:ky(jhs doubled, the power dissipatek x xl .yg.j:nh(1kf6o;ajyn1d 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 with constant current fc w)b 8lofe6cu 6b3+klqe;zb /lowing is doubled, the power di6lebq) o ke c36+8 zlfc/b;uwbssipated 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 co/+wq y1 ezt9udnstant resistance is doubled, the p td/uw+y1e q9zower dissipated 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 req n;/uf :a:fgjt ug;k6duced by 5.0%. By what percentage is tn ;6/:t;uf j ggaqf:ukhe power 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 respect to time is.e dx.ixjuxv ivz au(9-ct/a 5:l a10h 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 wire has twvnxl pg1 10ab.scj,s /ice the diameter of the other. The ra cb,1pl/1sx v0gs.a jntio 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 thcl*ov27xb1d b z (ifb.e resistivity becomes essentially zero at very low temperat.27 i*bv 1loxb(zfbdcures are 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 i-,kq obdb4r/d f 0.67 C of charge 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 apx o bzy*oonsnz-z: /.y2s xx/x )a2zk-paratus in 2.0 min. What is the averazzn osb)xx oza/ o* n:2xzy/2.x-sky-ge 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 sjd qcnb7ty5+ ( 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 ifbeyqih7( 5/4xa 3dq 7diptbe1 $4.0 \times 10^{16} \; electrons$ 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 m*xn60qjccfbj 5/:hj of current, has been left on for 10 min. Whax m bq:60h/c5jfcj*jnt is the 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, it is desired to deposit 40 mg ;iglr8 nhd v jec4(vr.u58a z,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 sl vczj. 5na8h,r;vd( iuer84gilver? (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 flp u 1dd+o enn2 /9r:a*1s;pgeizl dkk1ow through a resistance of1;nku niz1od :pa9es1lk+ddr*e 2pg/ 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 i 7tpt vnoeer 4ivvg5. +a20wu4f the current 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 b*jp 7- h,uqk65wwys x hd)gn-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 heg nvqma*apgfe+ b.i,: t-.91.40 A of current. What is its resistancenqb f ie.g*me9p ,-.hv+:ag ta?

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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 te-z, se8p+rv rhrough the wire,+zespv -r8er 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 bs , sgpi5abq)ese1dg 57)o*o wire of diameter 0.40 inch? (The resistivity of c )eb e17s5osdpb )sq 5*g,ogiaopper 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 1h2 ey /fgl,;1w;(f wb edrenea circular rod 1.0 cm in diameter and 45 m long, if the resistid rl 2eb11e(;, /hgwfefyn ;ewvity 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 (resist3i13pqftrrqd:8 5 jrtjy h:8civity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (retsq /h/e8i93tm 0cbwbsistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 3-1l kb6 v 7z5 s0g:tnlmiffwy0.040 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 r4;y1hjku( 1e mclp 1y10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire4j ly1pre1m 1kyh( c;u if it is connected to a 12.0-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 cross-s hoh(a;ll6o)q ection, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resoolal(h;) 6hq istivity 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 radiuo(b )b /f-uilci7pe ;vs 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 71 0rjrmcl h0k(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 resistan(zpo3oyk+3kv/v xhd 3 1ma5tjce 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 .std ogvsex69 l z90b)b9rsp-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 indiioy-6 yy5c 8s q15hdoyum. The resistance of8q-yyodyc65sy5h1 io 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 through 5.dexobh -4g2 nan8zbf*w ush5j/-nx 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 1200 aeh +(, dl-, ljj4pjvmW. 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 dr+y3tfc tn4sd.g c2 i5haws 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 designed to be used i)wy:u3+ wpa k ei5gx ,jsz;kz5n a 120-V ciraxj+z ewgi :kkwp3sz ;)u 5,y5cuit?

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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 itsp.p)z(,2b ck+ x 0pupxhf6mpm heating element?z(uc)2 x0p+pph6f km,b px.p m

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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 43g)/qx s9pclxzfrk(t 30 m xz*iftw8$1/4 \; \Omega$. 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 r3o, ye 06bsxxsths 3/hated 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 120 V, what current does it dra1ofda iy 2,ol8*x)wy bw?

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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 adqi6 twww5n-ewm+,k. t 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. What is its resb0y;--sdmh4z 3qde d jguj)cd)5f3edistance?

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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 soldering iron for 8fii-or edr(83;t,58 rsd arhs .0 hours, if energy costsia;ds8( 8rhe,t-r idrs3r 5of $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 hour7ijp:u 1s rr.kprmp 2q02xd h*s?

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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 (mlh9wm biqh8 w9 4z6cline for 2.0 hours. How much heat energy is producehql98zwm(6 9 m4 icbhwd?

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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 doqb//0qqb 2 g,*e1rr9fnxeh +q1nfj ubes the battery store?e+r1rfb1bqnjb*u0/ fqxen /,29qg qh

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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 25euj5wky a(ex 3 2i+c7q-W soldering 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 10a0)y foyo+gy*/7mx00 hnc oyo hours per day. Assuming the power company charges 10 cents for each kilowatt-0*cgy0oo0 )f ayxnh/o 7y+oymhour 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 turnedm--wc6rlf gnh+(nxt0 on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the ctm ncn6+r hfg-wx(l0- omputer 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 centrn20zxx5t p v8lal air-conditioning unit f8z20xxl vnpt5 or 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 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 gjb esij8two de1m),2u,; p/edrier operates on 240 V and generates heat at the jp t2)o8,g/ej;w1edieu mb,s 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 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 flowvhfg7-5yfxmf**0dlc 0acy xi1c *bo 8od4g ( ls 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 costsgje4).l vupyau l ,(8t $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 mu hir )6+ephhlwdr,rx 56r) wdfd;0u*uch curren l0*d)+ur rd6hxhpuf h,er r)d56wwi; t 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 power source. What rms v u/4gg4f;woe current flows thr4uowg f;g v4/eough 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 peak c- w0s-ain-g0 fvihj)furrent flows through this device? )ngji-0iv0a wffs--h

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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 )cp/gc - c.qnxthe peak voltage across tng p xqc).cc-/his 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 safe current it can d m)nvl(j3. hiq9t8,1cavexm carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift velocity of the electr xin981h(m3t.c ,)vd aeqlvm jons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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