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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://mail.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://mail.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 into mkt79 f 4d rjq9;rz+yrelectrical ene4d7yr k jqmtfr;z+99r rgy 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 wire's full cross section at an5 g-wfukil 1,n5ff ;kgy point per unit of time is referred to as1;5u klkf5-w,ngf g if

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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)acgbdi2q,xmi f3*o :; rl.f t 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 sameodt:+x9 qzp-7lld pvzam/n( , 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 t1ss y+by832ppnntk *m4 f9 z.(cdtke yheir

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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 t /bp mc+cc2at 9asye0l6 gzw+d**,afdefined 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 gx4m/zk3a vz .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 depzd5pa4r8 j 9fgends 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 re,ipwe g+jl,i 3sistivity 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 :vok*qj2d7m4 d8 zsdu vg(dv8wires. One has twice the length of the other. How do the resd4u8 : dkjo8d2(qz*7mvsd gvvistivities of these two 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 win:)5u m3w1f*oiuhwt zres. One has twice the length of the other. How do the resistances of these two wires compu )15o:*f3ut hiwmzw nare?

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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 twic0; vqdziui 2o;kjv2 zbu17-vbe the cross-sectional area of the other. How do the resistances of these two oqvz;u1j-0zdv b2 i 2iub7vk;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 lengthi,*qq+hi; v2l 2tffes and twice the cross-sectional area of the other. How do the resistances of t2i ,qtqifv e+sh* lf;2hese 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 d1f8/2 uooevank s h9rf4f p3g0-dsc*xoubled. By what factor does the regfp2 fv9 a8uxc1nrks3o h-ef40sd/ o*sistance 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 2.0 c(5tynv t12gq u/*q gktm diameter rod of the same length and made of the same materitn*y5t1tu( k g qgv2q/al?

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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 aa)6apu3r ui -metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature cot(l779zmliroag g/o1-9jk kwm n 2v esma 3r/7efficients 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 dw*l+03zelq hto?

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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 equivalent 0a9p71 qjh mgvto

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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 dxf1e9wlar q: 6e*oosa0q*0al oubled, the power dissipated by that cirf0ar:wol1l06ese 9* qaax o* qcuit 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 resistanctls 9 s k)huo6f3j 8im:9e .v7;.s.qjcnhglvke is doubled, the power dissipated by that circuiuj:e6.k 9c9nh )v t l3q;hssm8s .i.ojglf7vk t 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 9l r-lxwdsa2. circuit with constant current flowing is doubled, the power dissid2s.x -arwl 9lpated 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 constant resistance is doubledy(d/ :tzvnq0 p, the power dissipated by that circ d 0(:/pzyntqvuit 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%. By whea q aaqxbwaz*(b/ f8.w5/5th at percentage is the power on a resistor affecteda/taqhfeb.xwaw 5*85a/q z b (?

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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 re8n o1/kjnu*t fferred 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 th 3,1mcelp5 ncarrying a current of 3.0 A. One wire has twice the diameter of the otherc 13,5thlpm en. 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 low tempera*f( l8ojx,;wo5h kg rqtures are refer oqrh( ;8,g5j kf*xlowred 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 flowing43jl3 s ulndt6vod35iw* 7okv if 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(lv3-:y f jctm(zxk q;: ftzn(j5yk;b apparatus in 2.0 min. What is the average currenj3fqx c;ztzj k(;5tbk-yf m:ylv(:n (t?

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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 A?b 4j9t gq 2(gnf(0iafs2je; rivxd-:u

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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 flowinp q)ucncvt-vd4 8mt .c8om o:.g 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 dr*i u1 c9dpy+ w 5jj0j9r35gwiuen6v 4zalmca1aws 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have passed through t39wn 0jvd 1imiu5wp*r6ygeu9 a ca5+l1j4cz jhe 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 procftccw5k7rx-d(kw3s ) k 1ivyw7 7uw3 jess, it is desired to deposit 40 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 mrk ( w1k7ti5fy 7kwucvd7 jc wx)33w-such 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 4.00 A to flo o,tzb5o( js:a7r9d 9l*nif rww through a resistanc,i:s5tn d9z9b7o(o lrjwfa *re 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 ifuk: z3 yuc 3*fp4so/*)mp acah 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 V. What current w(d+ra b1t5bzlyy :i1q ill 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 dt5p4fq-1cu6pzkfs ) 1.40 A of current. What is its resistancek -4 t )qpu561fzsdfpc?

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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 fynavhqx ;wk4z 8 6vw36low throug6x vvz43wa6ky8wq; nh h the 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 co d5 dhbgn-acj3u07r5 lpper wire of diameter 0.40 inch? (The resistivity h5r7n5 glbjdd ca- 03uof 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 in diameter and 45 m long, v4h. ; uz;agh, f1niwbif the resistivity4 w.;v uagn bz;1ifh,h 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 (r chr;5nzviza/+ m)i i9esistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivit 3z ec*un(-fvly $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 its rm8* ms75djns ztg3 +tfesistivity?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the current th t;azj)1nf. lios(4mvgbv. w8 rough a 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battebaitj)fv8( on;v.z 1 4gm.wlsry. (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 lonv bm+2(kp q yqi kb*3m4o5y/vsg and of rectangular 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 coppb4*k(pmoy bmviv/2 s y+kq35q er 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 y 6aj6y)vu;u cy ub4),/ jrrkdof 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 (resisti7x gb .-(txaslvity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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.l( kzqy,(keo resistance 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 coeffib ;fobmy x;-d+d w9:oecient 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 indium. The resista 6mnswdmk8/;ndi :z p(nce of the platinuzim 6;wdn8m:d/(n ks pm 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 thro5 ji9ruv8a7 rkugh 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 W. gp5lz;4 my3ic o9l-zh, c+ugq 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 runno eck0,;k3zfmblrdi )o2 g;)hing 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 rs0xj;fst , *usesistance of a 100-W light bulb designed to be used in a 120-V cir ssf ux;s0,jt*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 of its heating.*nnp f+rcp41qxq f(7cudss , alg17yy ed4i4 elemen,d7+ge1ucx(cqp 7pd1s. yyl*r a4s4ffni4q nt?

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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 r+,; hx hohqk.6()ome vs:nfy xated 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 ajf r5 0c yz/rfms5i6l(*0s-cur8tdorv.ewa3t $1/4 \; \Omega$. 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 120ph4pgjmobbp +(1,ou x3u 2k8j 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. 2smlg1 vtk/.v If it is used at 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 21 e5r) ze:edesyqt4okpvp8/ runs on 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 cost to operate a 25-W soldering iron for 8.0 hours, if i .f+cwh fs0qzk 0wp;*s,,v*ei cji7n energy ip s;*fj*hec wvsf .7w,+0z,ikniq0c costs $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 bulblcx y3ap y:q4o-xe/zk.+a k9o use 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 2.05o 0:8g jnytptng ;+pa hours. How much heat energy is p pon8:j +0tgn;p5ytga roduced?

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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 en2ecslnofn 1/*kari ): ergy does the battery store?n/efc:o21asil )k *rn

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much energy does3)n lco -u-a* fgzobt2 a 25-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 10 hours per day*1r qflccm,etz1 4ce 0(q bz)c. Assuming the power company charges 10 cents for each kilowatel4tqcq mc1f(czr e)0z*,b 1ct-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 turned on 8.0 hougg 5z1i.b ios04ct+wyrs per day. If electricity costs 10 cents per kWh, how much do.5cy4gtg0szwb 1 i io+es 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) electr,u0jnpu 5v ljf.wkt02ic 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. 5.02uvk jt,ulnfjp 0 w 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 drier operates onwhw;z;t;. u/menfy m* 240 V and generates heat at the rate of 2.1 kW.m ym . n;;h*wu;tzfw/e 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 throug9vk*, /oda+qxejwb9ph $8.0 \; \Omega$ 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 costsi-joe .t ,tszy-rwx n2yb7, b( $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 wor ,bd -fdp1it:k( pjmi4k at the rate of 2.0 hp has 60% efficiency. How much current does -j4:(, tfdkpm d i1ibpit 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 current flotnjzlo2m;* z+ws thn*ljtm2z ;oz+ rough 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 souhzo:/:hxvq0 n/l9vw irce. What peak current flows through this devic0lh q: xvvwh/nz :oi9/e?

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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 12egl004s xw01 peshf*e0-V ac power source. What is the peak voltage across this des 0 pgf0sx*w he1e0le4vice?

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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 maxih5 hwrl+8 7tphmum 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 one cubichp+87l r5twhh centimeter of copper is $8.5 \times 10^{22}$.)

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