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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 traq dw4x0/ejh 9yql1u f8nsforming chemical energy into electrical energy ishy /48fxq9qel 0ujw d1 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 pask*4yh-:7jse0n:ozz 3 jewq wu/d*j l pses through a wire's full cross section at any point per zl4-::3uksyee/7own qj0 j j wd*p*hzunit 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 direction thhjfadh 0;ub37 wv z6m9at

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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 thfw6v / z*(*;1o wf7 ppz sn:-yvvdsqmpv06smw e 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 iszfk4 7ffqmxoidw*+ wxjd;-n:, ;8is u 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 4 oa .gjyi93vtis 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 ise:c 5: 8yw 8)kso.xdw vh)xxb+8d wmfbyjn4m(

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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 wirj*zkg/i9bop-m ) 0gsue 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 ,,ql). vu r0hkz0ogukfqy /uvf.0vv,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 lkq:q qam497r eength of the other. How do the resistivities of these two wires k are7q:mq9q4compare?

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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. Onwe6jzi0kb3y ) e has twice the length of the other. How do the resist) zbikwye360jances of 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 *gpi h81ae (ejhas twice the cross-sectional area of the other. How do the resistances of thes8e igpe1j *ha(e 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 length and twice the cruic0a25g ld6e 6nqyt5l+ la3ross-sectional area of the other. How do the resistances of these twg cr23 la0uelaq+655 yinlt 6do 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 l gydhed+6ek tg-q l9ip ,a7(8what factor does the re+7-d, plg8eteld( 6ay9i ghqksistance 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 tgxgy-;tb p*2io a 2.0 cm diameter rod of the s* x;-tyi bg2gpame 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 met3j 7flhdr+ ;rzq( zong*)1 rjuals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficientla9 7jyvr64 ops 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 to? q7sfu g. mtur.ve;5tel 411yz

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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 equiqg h5 jzemyx5) bgv2(+n.dz m:valent 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 98lo 1,dtvfz9kcnmu 1 power dissipated by that cirfozdnvm ku1t ,99l 18ccuit 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 is doqj (mbpo7v-ibm.b ) -jubled, the power dissipated by t-7pb ij)mo b-vmbjq.(hat 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 is double w07,xzq-i wdod, the power d7z, dxwqw- oi0issipated 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 doubled,nbs7z. 6lw2rc 7v hf5d7-x fx n(8qczd the power dissipatef7-b d.nf72x ncz5xd6vwsr( 8 qcz7l hd 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 voltt41j qf*)l h8u-s w b.g5mwujdage output is reduced by 5.0%. By what percentage is the power on a resiwgs4 bu8 mdh)1u qjl-5j.ft w*stor 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 t domfjp6x- sy7;ivm d/l+* 5fhime 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 carr()o2y1frpo 7 jtiu +zkying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of oz+7it1jpy k r2u)fo( 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 be/nbnlt2p8ph t74 gxqdjtfj-wf 4t171comes essentially zero at very low temperat4xn1p dw-2tg7n4th j q7p /t8jlf tbf1ures 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 if 0.67 C of chargethv(cccg *.*8tkv ;lm 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. Wha nx9jhbv.e22lqd6 s 8at is the average curre6n8al e s.hjx22d9bqvnt?

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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 bev(. 5drgi/j dd 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 flowa zei-y.;b*8:sgn vjb ing 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 -puomkbo d 1ct/d4+zox8 9w/t 13.5 A of current, has been left on for 10 min. What is the net number of eleo9o8x +z41w/dt-tu/cd kmpb octrons 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 of silvp1wm xi)a,r.a( oolm dep *cb(r;d7u)er on a metal part by using a current olo da;))midum(,wc(7rpp. 1bx *e ora f 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 t 5oxkuvc 1l p/*og2/zso cause 4.00 A to flow through a resistanxgp*5o o z/vu2 1clk/sce 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 iqr;4tdp6 6xbbqe. 4lu :tj v*lt 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 currtcl.tzd*c-l isz2(3z jp ai82ent 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 ofls *(sy7hbzx2 current. What is its resistance?bl7sxs (2y*hz

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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 c q zvj*pm6.u:zd* e,felectrons flow through theve z*:uc * zdm.,q6jpf 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 0.40 inch? (The resisj 8g5ir,z7 hz hl(loyr*4 uu5ztivity of copg(y8rz,l57 i j z*ho5zhur4ulper 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, i(v,,fuen;q hb2y 6 w 3fwmhj4if the resisti fevbf hw n4qhmw, ,y6u2j;i(3vity 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 65e/no ctu( iswire (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 wirnn1mt 88ovp47wt ovi,e (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. What is its res+jkeln)r9x4 )heze o (istivity?

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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)u;4zcyxq( tf t(fdl0 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The y(( d)4 f0lcf tqxzut;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 crosvvp guxx6x 0(6ytl;;wcc a59as-section, 1.0 cm x 2.0 cm. What xav;c69yx; ( 56u0l tapxvgcw is the 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 0.50 2n5e3)hz nnarvp s 42emm 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 (vo +6vp; p7ckifwp . gju8*2ymresistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistance5l cf;(nlm/t1 nhl7fj 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 coefficieg+ip7rfjq c3: nt 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 resi xxyti)a4z3b g)oj 9;gstance zgxj) o9i;3 aty b)4gxof 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 through8*m*8ghewge )6uirka yijf+2 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. jzj 5wqht3;x5lw0j 6d 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 curre/ 83jgclxg rv(ujw72xs uf6 c3nt?

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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 resistanceapafp+ko ;n ,nm.htwbtr -7m.36 w-er of a 100-W light bulb designed to be used in a 120-V circ7k.h-p-+ pwtm36a, ma eo.wn bftrrn;uit?

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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 Wh(+s 2w1hsdpo sy+s3w at 120 V. What is the resistance of its heating elementy pws+dh o+ 1(w3s2hss?

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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 ratedn un(l0mq9b90ua o1a j 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 6i ,m(vc) lokxuss;o 4at $1/4 \; \Omega$. 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 drawu3la5h.5rzd(c rab +y?

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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 12+g/x(r2m0 owlqg 9bn9+ett lj0 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 rety89ahop2d, y sistance?

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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 energe/gez)s5+y(y3gnp y/;eehg7j5ryh j y cg3)p 5+gyeh rjyny5;/e7e/zghs( je yosts $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.s; 6 dydtvma:30 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 linewj.a0;zy r1ap for 2.0 hours. How much heat energy is produced?p0j .a;wr ya1z

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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. pz 1e ea 3(ui.rgd99cnlwi(m2How much energy does the battery store?993aenl(i cpwm (u1erg . izd2

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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 sol w;c6 hrg*.(os,al pvkdering 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 do wm8d -nr(up:ay. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to operate thnr(pdu:m 8 w-oe 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 lth3 uh n ufn)c,jf o(r7-5w/c8.0 hours per day. If electricity costs 10 n)fnw35jc -/h urfucl h 7t(o,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 central air (ud:l6/qfgrlr vw0:c -conditioning unit for 2.0 hr/day at 5000 W, and a series connection rr:: g(l6cqvw d /luf0of 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 drier operates on 240 V anl*; /tpyi h4add generates heat at the rate of 2.1 kW. The heating element shorts out and, in repairing it, the owner shortens the Nichrome h *i/dyap l;4twire 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 th,rt3ep irn8 py x0828cd: hvewrough $8.0 \; \Omega$ 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: :dhs p70bstfs $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 lj6q /lb1, (fk7 jqyapl3x)lowork at the rate of 2.0 hp has 60% efficiency. How much current do)b 6f/j1yo,3qaklplqlj (7xl es 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 omz j8e 8n 4cqhfw.53nac power source. What rms current flows throug3m zw 4 8hcj5eqf.o8nnh 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 current flanrn ls4vgo)fctf1n3 aum ha/:0ox 6s ;o1- l-ows throu0o1- oal fa:tn u-n)1rv/os4xgfm c6s nla; 3hgh 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 xzjv- 8t/lorfin 9j;/ak-+f v to a 120-V ac power source. What is the peak voltage across this devj9tkfi-axroz/jv;/ n +-flv8 ice?

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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 0.08 o)ba3 61hjce4o0aq fk1 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? (3oj6 c0fh eo4abk)a1 qThe number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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