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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 cmwi: prxn 4v5/em,+zu 5( ofowhemical energy into electrical energ5rnf mzwu e,/o(p+x5 wmio4v: y 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 sectvv5) wqmrn ,50abikgyxb/f./ .; zjc bion at any point per unit ;na/v r b,gf bw5z .m)ky5jvcbxiq/0 .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 tmvlio cz:6x s9hl6( prqsm,, 1o 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 2w13- cu ucdtn6o98hqxrhx-d 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-ho6u wn2 +m4itjlurs." 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 wirw.3luyr:s0l re is 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 w6bb7l n9 -ktnmhp-/awire 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 wi sf e+w)a9 e2 z ofwt78p:/gh0teq1wr3pyexu/re 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 lowest resistivity valxa2 /pqhta+b;ue?

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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 twic)llsbrvy dz9x9q +l55uceilx2y05sz 5 ys4 j7e the length of the other. How do the resistivitsls4i+7lv 5y92 czxsdlul5q z yrjb905y) e5xies 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 wires. One has twice the lquc 0 df3(+duu5aesb*km5r e9hdkm(5 ength of the other. How do the resistaeu5 umam9hbd*( dc5k(5s kr0q +feu3 dnces 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 has : 5y5clbciiu3skaf dl,/ddr a0vug-1, . k 9uqtwice the cross-sectional area of the other. How do the resistances of these two wu0cd5g 51:- q9 c ad3k uli/dfvkla,.s,y biruires 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 en;xub* b7hlc1 -es:,wlki4 0ddm( qthas twice the length and twice the cross-sectional area of the other. How do the res4wm:l * e7qi unb0ebxdkt l(c, -s;h1distances 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.oekg28k s i:b9 By what factor does the resistance change?s9:kg2keb 8oi

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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 diameg62h y;gk jnu;4tdwmdn + (x.uter rod have compared to a 2.0 cm diameter rod of the s gt(4g2wh dndm;jku6uy n;+.xame 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 commw l;xxwo7,va oza jmyc/.w27u730b yxon 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 resisd0skher)8caaj8 7b1)y8v s putivity

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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 equivalenb8jaum t06sy1 t 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 equivaw bjjz-u2u b hycy.b3*2lk ,n.lent 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 power di hf *t5ea7aokcf.0t5h ssipated by that circth0a.55chk f7ta eo *fuit 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 resistapz44 exsax4 rcn6f3nds3uc6/ nce is doubled, the power dissipated by that circuitx346s/z fdxa cu 4e n6cnrps43 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 doubled, the 4 syga,/fekty69/ vci power dissipated by that circi4/6fgy v atsk/ ye9,cuit 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 mhalrqwimn4d0a 036 9of constant resistance is doubled, the power dissipated by that circuit willn3dammqa 9 6 0irhl40w

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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 reducedy /5kse*tn6 hm by 5.0%. By what percentage is the power on a resikms 6nhye t*5/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 time is referred to a ;.8gl1sl)r/yd ehc c0k9hphe s

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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 eacgxi/ 7yojt 9g0h carrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drjy0ogxi7 9/ tgift 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 essentialid v7tww5gc:a 6c7m n4ly zero at very low temperatures are referred wd6awtc vm :c775 g4nito 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 odzv,jmt6id3 a)fj 2db;3t+kzf 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 a ;bv5t5 6 fd(ch,c mq0 8vu.tiaz,lsbmn electroplating apparatus in 2.0 min. What is tc65fivctb5b8mt,qhs u;l 0. v(da,mz he 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 b4kt ;x fkj0;huy a point in 10 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 flowing i,3m 4xzjj ik(iyj-kzh*8c hg 9f $4.0 \times 10^{16} \; electrons$ 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 A2 th944*mfndr.,y8tu/bm wac krsie* of current, has been left on for 10 min. What is the 8rt2ht,wr .f*e4day/mn*4sim 9 k c bunet 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 of silve inf* cyb4oq;e3-v/vg r on a metal part by using a current of 2.0 A. How long must the current be allnvyqico3;* fbe 4/gv-owed 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 to cause 4.00 A to flow through a res; umc x3f5d 6.qfm2ovtistance of 3302mfvdqc t6x5.of m; 3u 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 5x,q cch0- .fgv.0-W resistor if 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 alb v-nt7d 1 md4ben, fk(i,6uacross 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 resis6vu*y;fk/j 4n os-a uphug9/dtancesa /hk6g vu f4/puo *;-9ujdny?

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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 elfhy3a t 9hp+hm2 ,),0axd tnxxectrons flow through the x,aht9,ny 2f)m ha htxx0p3 d+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)kl pl/g. z/ /sl1pzsq wire of diameter 0.40 inch? (The resistivity o /s)qpsll .z//k1zlgpf 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 e 6x*m*l cw3fsin diameter and 45 m long, if the resistivit x6cme3w* fs*ly 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 (resistieg06hd-yy 2wb lyi2jgp:(* yvvity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 d6,t18omsg k:qlpoybf0c,y-wire (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,xr mwfq0vefka k)+-.8 4.0 m long, measures 0.040 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- 8w261bcz ey otc2vgp a 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V zvt2poy6-wb 8cc 2g1 ebattery. (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-section, 1.0 cm x .+4 ist4:eni q+b eboa2.0 cm. What is the voltage drop along its length when it carries 4000 A? (T tb.e4qi n+4o:+ei asbhe 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 a resistiywwy+n50 m0d9ot) rkmdojt ..vity 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 coppeg)1r8tp5v qnhcze;gg 170;uvbuf u ,ur wire (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 8* m- u1ged b31qxmgsu9x/udna 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 coeffic.f echlx -j3:u zp8br-ient 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 poe5:i espi+ jk0int of indium. The resistance of s0iej kp5:e+i 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 an f f-yr3k19 ) 1fhl fr ai,aiyafxs+y63$10.0 \; \Omega$ 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 g9n8-gb3ru( hqule2 orated 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 lhd 2tb8h 3 /d7waukhez37hl*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 resistam5 zx- bf1;j* evl*jvidu8*rby 5mfd( ;zlx h4nce of a 100-W light bulb designed to be used in a 120-V circuib** yu5ve;vmjrz li(blh*z-;d d 48mf5xx1fjt?

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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 o9 j)q8v. a qlhlu 5k2;iibwe4df its heating element?. lad) u8;lqqwi9eb5vh 2 jki4

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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 rz/iwa uhr1j1)5 6g jhrbsv f71ated 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 ratk(rs0 l1ido /sed 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 q3 nheab *;o5cdraw?

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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 b ;wy.a06 *vj.db6mh zrgugv/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 runs on 110 V. What is it4 g/;ool.mu ygynl 9y qie5-ys(/v k*qs 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 sd( dkfrdrgu 4ge 385r6oldering iron for 8.0 hours, if energy costsd65dgdru3k4( r8fe gr $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 1shm iz0)0hhmq tbq75*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 li/m 3t 2xaq+6zobeo b;6jyt/done for 2.0 hours. How much heat energy is poztmjb/63 q;xbd+t/ oo6y2 a eroduced?

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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 e8 i(7 bcbyluapejrt7),s,tk/ nergy does the battery store? 8 lbtk,pac(7 u/s)tjr,yb7 ei

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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 2:q k73y *7z hes17yicg cj1x.cj:nk pm5-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. Assuming the pk1xepw .j .t)lrx/o)d/n gb :dower company charges 10 cents forxt ).b:o g d1w)jedx/l kpr./n each kilowatt-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 ho er9.xp-*;g )46 o gn xlklaclz0/kokeurs per day. If electricity costs 10 cents per kWh, how much does it cost to run the-xke60n; kg oz4alxg /pl*koc)elr. 9 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 cenf-.cuez+5.tc m d.nq0bsgg6dtral 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/dayed.6qs ggb. .nu tc-f+cmzd 05. 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 and generates hez 1 g9.*8itzteywa+pc qm*i 5uat at the rate ofmtz+w. gua*9ip85 z*cy1teiq 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 flows through xwok 2. b43ifw2f4p pb$8.0 \; \Omega$ 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 costs ..ntwrn )-w gr0lzgu6 $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 muci,d.+l3xat1llc i-xq h current doesa1 ll i3cli,xt-q d+.x 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 connecttb *bud 3qr:n72 otsh3ed to a 120-V ac power source. What rms current flows th b3bnu*2qhrstt3o d7: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 source.15(y 7fimbsye What peak current flows through this devicb y1m (5yie7sfe?

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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 d.h +hgh(pr8o120-V ac power source. What is the peak voltage across this h phhg8r +d(.odevice?

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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 bq jli;f-f73u p2d+ bd4ltt(zcan carry (in order to prevent fire danger in building construction) is 20 A. At thib3tfj- d 7lfbd +zluit4;(2qp s current, what is the 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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