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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 ch8+0tfit8c z loemical energy into electrical energy is call 88zol0 t+tfcied 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 c+a6 ou41thq;3eq8m qeqynk8 cross section at any point per unit of time is referred to 8hqe1+q8na qe4ty6u3; ocqm k 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 conveu.5m1*i 7qoidpf 9u8)iwass +cn vj/intion 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 e5j x2u/ 0kpafsame 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 "ah vpny)+zn:0zmp-hours." 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 wa+ :llk *i7 ideilcim4 weh96*ire 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 wire isv7h.n9g pmi/6n3 ) wibbgm3et

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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 depends on-q eunx30pv.x

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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 lolt 4i(hlxb sod2zr, wd9*)m 6jwest 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 length of the other. Howk 41y.9y)wkfzf8 x39osv iq uo do the resistivities of thes8oz9i9swqfo43fku ) y.y kxv1e 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 twic:4d0ukyyhhrn-. r 0v ye the length of the other. How do the resistances of these two h0y-r hvn0d4 :yur.ykwires 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-sectional area of the ,:h) /p3*vjhkk s1n0uac g*ais1ovqq other.h1opsk) *s ,ig aqq uv cjnhk:v1*3/0a How do the resistances 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 wiressk5x 73o o:b0eyf(tw x. One has twice the length and twice the cross-sectional area of the other. Howx7 (e5s owf:kot0xyb3 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. p*l,fk4 +c fwm9c; p1omi*fsjBy what factor does the resistance change?cswf+; mfo1ikjm pp*l 94f ,c*

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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 +h* kghvv yx1/3h z45by v+cnzdiameter rod have compared to a 2.0 cm diameter rod of the same lenh+1kyc*53x n+z vgvy h/bhzv4gth 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 met u3mi*aj vu/./akl-ki als

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature 2qm55,t rsr-b di9hatcoefficients 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 equivalentgio;jopt b irge099 )+ 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 t* z vdfz.n/g;*ie+uj jo

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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 dum1qxr2 jolu1(c(- bmoubled, the power dissipated by that circuit willclb(2 umuj1 m r-o(x1q

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the voltage acrossov)au p iw5,+(cb5nyc a circuit of constant resistance is doubled, the power dissipated by that circuit wil5bv cic,p()5an+w oyu l

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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 flow; )p5,g1)0oivv il vkdg3rrieing is doubled, the power dissipated by that circuit wil5)vlir,0 ivk)dpver;i g 31gol

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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 +x qd 7y e6sf)hw+3bkqis doubled, the power dissipated b6q b x+yedf)hs +37wqky 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 fgz2cs:7ptj6 04rncxis reduced by 5.0%. By what percentage is c2 s7c06tpz4jr:x gf nthe 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 t7)vwpdux541;zn7rxsh 7ksye wu0 k6 q o time 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 carrying a current oh3na1 8ln1au8nk2i3uhw rq7 mf 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocit w8121mn7l33nq 8rua ua hnihky 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 teen2,cx yjbyqq1a4,+ cmperatures are referred toca4+2q,b1 , ejynyxqc 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 charge p/55q(3ai.nrone)t s/a fet joq;9v8sy5tq roass 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 passj mpsg+qv2( dp9 ;k3oses through an electroplating apparatus in 2.0 min. What is the averagpko;m(+p2qj ds39vg se 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 s)xn8ephz 5lep b l*7q5 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 flowvi4cfm7n fk*-.yix6ring 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 nhd -tz+ r+*wce5adw/aws 13.5 A of current, has been left on for 10 min. What is t5twcrn*+a-d/+ hedzw he 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 of silver on a megt h.0.q-1) turp zr0p.6 *eq ypgftpytal 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 are singl pr )t *pyqe6rtptzgq.h1yf .0p.g0- uy 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 cause9qab fy5( 5sj* rzmrl7 4.00 A to flow through a resistance of 330 7rabfr j m l9*5yq(sz5W?

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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 5.06gm d7n9x+ yqq-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 across 220 V. What leo9mq 0:o2 i7, cqj 1xrm;fwjcurrent 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 o.;thhmx 4rg dwwt 4u*6f current. What is its resistance?hmg r6t*x4u.4w;wt dh

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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 thr6wu9 zvj : jxfz:+,ortt7d /wcrd8ai 3ough iz,9tjdwj::u/+ arc tdfvox7z w86r3 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 copper wire of diameter 0.40 inl qzxjw13 jasq)i ; 08x:jdqc-2g27 : gumslwych? (The resistivity of coppelgx 2 jy qg:7l imj s820q1:dcuxsj3-wq);azwr 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, ifsir5 8 hkyx13;gw *ccf the83wfr5; ci 1hysx*c kg resistivity 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 (resis3u s+1jpe0up ztivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resis rg2.s (s.fibhtivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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. b. y 8k/f3fwuy,2(rwd edb 3qzWhat 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 10.0-m long 22 gauge (the radius is 0.321 mm)4l z;5aolf)zlwhch7-h/ ku; h nichrome wire if it is l7; -)z4 whz; 5/hhcaulfkl ohconnected 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-sectio;eeu 6pd4 x1kyn, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of copper i 4p uy6x;1edkes $1.68 \times 10^{-8} \Omega \cdot m$)

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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 rexabi 0b,71s3 ixa0dogsistivity 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 (resi2s,6 j6yeim hvstivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 haf961*6-x.e6ocykpbwm d t kpp s a 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 coefficient 2pnrk+r 6iwjz91ejok vo1 (b46+lxi kof 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 resistan,tw )w e q kn,7qlms+h7ba3pr;ce of th, t7kq3 rws)mben ph7+al,qw ;e 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 throuhxuqfu(o ;( o,gh 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 curren 8):bz f qs2nyi;2wnscoq:5m gt 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 curvafgt56+/yfu rent?

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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 in owmcuw - khbj+ 1u4m*,a 120-V j wuwm+c-m*,bh1 ouk4circuit?

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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 resiqdttk;s b* (ixhbv o0iwc k00 88k9aj(stance of its heating elementi0 vx;o(jit kh *d b8qstk0a0(98cwk b?

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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 w7syg eck;w3+8)rzk )dq ny*sat $1/4 \; \Omega$. 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 o6k *kl+c thtxab4j). rated 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 draw?3.ub5+mztz/a, itwva 9ett o1

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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 liibype.k,(6waz9 a; 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 runs on 1vrq(4 i iis8y(gqcq kl 5:*ce610 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 -vyxvd b;+:1p ;0p .eksepnhlenergy cos:-0p;+v s;lp1nyx . epbk hdvets $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 lig myg, ysf )9k7pefjpt l0el10b8 fuy9-ht 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 co eh;xf x b.r95nc-owt5nnected to a 120-V line for 2.0 hours. How much heat energy isxrnc9;5h-5 bxtew. o f 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 at 12 V and 160 A-h. How much energy does xr:flj;-qm+y the battery store?jyq;x :r l-+fm

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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 useq9rew t86jq,n)dmqg bk;kv 9. 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. Assumigo-go* y 83eiyy* hh7wng the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to operate the bulbho*7ey y3iw8hoyg-*g .

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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 mon -* 1+tj0tuuc vnjo4nvitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the compuuu04nj o- t *nvvj1+ctter 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 centr yp1rkuldo7f 4pr7f1pe/ 34 qnal air-conditioning unit fro74u 1ppnqdpr yk/7 34le1 ffor 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 dr65*ypatt od( v4kb*wiier operates 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, ip vktw6y5dt( ba**4 othe 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 mw-4re )k5jyi 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 costsij z4e,m z*3fq5yg ogo b6u-w: $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 the4v :plro2k-vahaw t-6 rate of 2.0 hp has 60% efficiency. How much current does it draw from a 120-V lraa k:w -lv-p hvo6t24ine? ($1 \; hp = 746 \; W$)

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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 powzr9( j; mii(+g*u2wal-tu ytp er source. What rms current flows through thi9ta;i (jriu yl(gz p+2t- wmu*s 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 f6+n 0bh7sc+n6ocmvdc wh e7p) lows through this )+6dhccs7c wbn0m oe+hnv 7p6device?

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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 120kj7xi4zgk0b( 4d 3tlk-V ac power source. What is the peak voltage ackjk3dltxgb ( 4k7i40z ross this 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 coppes5:j9 rdodmr.r wire is 0.081 inch. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 rmd .ordsj9: 5A. At this 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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