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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 c6nun4e 6n- wsrhemical energy into electrical energy is 6u-nrn6 s en4wcalled 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 pa.dl5 sw(nz opxs:6kv,sses through a wire's full cross section at any psn6 5,osx :zp(ldk.vw oint 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 direction thae9c,ga g;0h ixt

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coulomb per secondvbpjn 9zxcbxcybio;j w e5/ 4(e775-o is the 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." q.udm,:d-d:st*w(anwk j2aj 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 is def muq5-)sc.bpqined 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+b, d0lh*2ijrr 0wo r11wtonv 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 dep ybh:7td8h;x1 (yxrc uww27kbends 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 lo vueh2re,8yjf.; k+s nwest 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 ej g f.93 ml zsi d-3,(6ugbvsctqm)t6length of the other. How do the resistivities of these two wires comparezgg3 )( v cs6-m,f9tsdqljm3b6t .uei?

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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 tnp : a4yvr2hxj:vb +: finta71he other. How do the resistances of thesei1n :7+r vp2xa4ya:j fn vbh:t 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-section rmgy;b5 e t7py54emc8al area of the other. How do the resistanc 48y7e5mep5bcmty; gres 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 length and twice the cross-sec- hixf;5 zwn4btional area of the other. xfn b45 ;-hziwHow 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 the radius is doubled.07p v owch :4f1hvpys4 By what factor does the resistance changeco0yf:vp hs h1 4vp7w4?

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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 diameterjx 6k(b 35ijoe rod have compared to a 2.0 cm diameter rod of tk5eo3ib x(jj 6he 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 most common k 4 q((r(pnlf*h(ifqzmetals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficient plm4vcqq7m-8;ay1 i as 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 7lk1c4, q ;z;fy(cl9qwvscdx 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 equivalent me;g1vh;r) pfou;ioia7 m3,fzh ed ).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 c 8xze+ uocg( yuz*)25s braz,zonstant voltage circuit is doubled, the power dissipated by that circuit wil r)5co(+* asz8g be,2yzuzxuzl

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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 doubled, the p;u9l20*b ahz ti4gi;wcqq1 0isolgosk, e6 b9ower dissipated by that circuit 0b ;ic szoe9 bq;6k s*0wq4ga1 hlgol9utii,2will

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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 flowg 6fd essr: qkpmn33;:c -mf(ging is doubled, the powermff-6d 3rmq cp nesg3::; g(sk dissipated 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 t ol z7.n d qefy)aw/9e.2ggc3 e 9r+)7nmasnais doubled, the power dissipated by that circuit w 2tn.39a/e9r7w7ygc)lf ongen .dsqa mea z+)ill

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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 voltagz4qbh7v1lsz., yhoyop61gn8 o e) -o ve output is reduced by 5.0%. By what percentage is the power on y7 gb .ho) evonz1qyv- lzh8o 16ps4,oa 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 refesw e;o gmdrfq8 y:rx/+ l//-ywrred 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 curty3+:.m cndd-1iew fvrent 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 largydem-.1 + cntdivwf3: er 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 rjna murpd+ 2:8esistivity becomes essentially zero at very low temperatures are rnpa+ur 2jmd: 8eferred 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 ch; - hv- cwrd//qmmzq7zarge 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 ank s;0fvyc 7alb8gjip p; ftd*l5(9 8ha electroplating apparatus in 2.0 min. What is the average cuyf (atjfdk9abp h5;8g8vplc ;il* 7s0rrent?

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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 13nf*w-vy,pii 0 s 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 flow k2r+0y25wdmo+5prc y7gbl mkk .l* kring 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 curre:6 kopeg:gey3zb u/(li t8u 4wnt, has been left on for 10 min. What is the net number of electrons that hko :bp uzlg3/y6 g:eeut8w(i4ave 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 silver on a metq 3e no.fr0x1nal 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 a1f3xeqn.0 o nrre 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 flow through 2g942e gcgf2pfl*7r9nnwxwq a resistance of 330qg4l 2r2 pnwcenw297*g9 gfxf 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 current7qnhy; uwbq ;z, gg6q fu/1zb1 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 acrosw 8 b1vio 56dqd*oqe-/qxrn8w s 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 resx1; /-aflm ql z.gh/ipu8:ky+du uf(8 mzw -miistance:;wq-1/fhfix88 .zzlmk( mluma+ d -ugupiy /?

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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. 18/lzp n ,thnz2/zt kvxj,vg(vt6mwbu 1o-*e How many electrons flow through the wire w pnz/uze txt( -mtv,vj1z gk* 6/olnb8 12hv,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? (Theyh ckz1ln8hgu n4c-./ resistivity1nyh/nu-z8.gh cc lk4 of 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 lonb)vg ,mf3n;c i jbhc)2g, if the ;nfb,c hcmg2 b)vi)3jresistivity 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 wirb6iw dw0a f;v;e (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 wire (resistivitqm3s,.n :4 )ipryxc dxy $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistivity?b7nfs2 (.fqo i

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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 +k 0+xjkfqb xph/-d-tmm) nichrome wire if it is connected to qtx /+x--jf0kpdh +kba 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 lon3 x-*yfuzzx:fg and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it car* fz -:zyufxx3ries 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 mdnr o66m dgld5 *x o91is c/wsr;r66vam 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 wa2u l0 f4voa0eire (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 res8h gutlwc 2+u-istance 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 resistivit /fi8;8ic5gcvz tc770go 5vqpxoh/ psy 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 resistanc lp t;j-j7kh-7 ff;yube of the platinum wire isftkj 7y-hu-p;fb 7;jl $2.000 \; \Omega$ 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 thm -6lf hp6 1)jn;y;5/ol seiveu,bcgwrough 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. What curreidi)0yni4hu/y n;tn4nt 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 draw (a6txuzc4l b+9gu5uk s 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 3o,h:pdx jfjh2h:u /cy/l u3din a 120-V circui2,cd3hhxfu/ jdujo3yl ::p/h t?

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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 elemensihj ):*.dt6 nlzik 7l*ild )i: stjhlz6n.7k 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 e pi9.z8 ugy59sqccs. 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 ni.o-n9*2ol cy /xypsp4bl6m 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 use9ch;aq7;r ;xed j xn*jd at 120 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. If it is used at 120 V, wha95j z 40g29zr 2wliovlqj yx*ft 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. Whsd4qur2 , -lndat 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 ope h*euzg6;cqt w8g1 .4vcdtwj)rate a 25-W soldering iron for 8.0 hours, if energy wv8 *)qdctc.eh zg;4tugw16jcosts $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 1 5gj5avu9u .5d0gg;g a jodel/00-W light bulb 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 lingm apz 8ye+97m3-ezoo.m2y -z1yaande for 2.0 hours. How much heat energ8-+az 32a7-dzyo1o 9m yzamyengemp.y is 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 akp*42 n xznttx; hf)4bt 12 V and 160 A-h. How much energy does the battery store?pxx2*4ftk;4)n t bh zn

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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 8.0u(oxyg d 9wd75 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. Assum90s)yv 7s 9e)b jv8s- cqsgznaing the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to ybnsjq)v0vsc)g 89ss7 a-9ze 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) st-*kh5jmd z*is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost - 5*szk*mht djto 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 daysal x6)j 1o.e2 soup:ga.oc.mm ) electric 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 contribu): sopolgc.m1a.26e j m.axoute 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 operatesrzvf-4 rm7(3sb. b wvk on 240 V and 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, the resistivity of the wire will depend on its temperature.) What effect will the repair have o 7v 3r(.mrk-4vzwb sfbn 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 (0ip nn3r) 3y u+nti+dtw7unf. 8destthrough $8.0 \; \Omega$ 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;pwp,w2d9)4gpfpoi n mk 2, ggs $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. Howqe26t a78)tj li(sqa-xck. mk much current does it draw from a 26 je 8 qskmaa.tlqxi7k-)t(c 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 fl tsn e3by:*-uiows throught yie*-ns3 b:u 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. Whatw bxl+p m/v- sy:ja45c peak current flows through /yx4+cml pasw-bv j:5this 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 sourc4i.7/gvl3j5ifaku (; ll0dft 1ir-b rw,zadf e. What is the peak voltage across this device/ivrbwgr(fl u7d il ,if4-kf13la a.t5;d0 jz?

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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 cp2hg og528re3tx7cu qurrent it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is tht5cgo8u 72 q3p2grhxe e drift velocity of the electrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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