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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://autodiscover.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://autodiscover.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 intojk j35r; wjsj;er.2h u electrical energy i;jjuj .ehrk r5;sj23w s 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 thatpg, e g g*+p:*lm/ixdd passes through a wire's full cross section at any point per unit of time is refer/pgpg ,legd *m+i*x: dred 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 thag)u b9.c.sx cjt

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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 theim d)qmlse51y9 sn( cs**2ew y7vaj5l 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 i d .u0aeht61pvn "amp-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 wirw)-ay )4(pq pqdhd;vlyz52vu e 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 wireszfwq*jx-*+-s/ua o4sr a6ki 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+tqgh 6 rsri -rd d12qza*k2i8b8)abyre 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 valuvi / f6z xpi.zxbz98r4e?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wxg,nm yf.g7 )nevrrn 98io0 d.ires. One has twice the length of the other. How do the resistivit vfngi,e modr0n 9.nx.8) ryg7ies 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 length of the other. 4uj7tyb(s5b t How do the resistances of these two wires compayb7(st54 j utbre?

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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 cros4h k+*ue gnq6h, dw9ixs-sectional area of the other. How do the resistances of these two wirenh d4e g+h 6*qu9iwk,xs 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 twx4q4tu(1t h8fp nqzf)ice the cross-sectional area of the other. How do the resq)1tf(uq4hfn4 zpt 8xistances 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. By what fap)p q)qluwvl9; .vqt-ctor does the resp wqlt)uv v9p.;q-)lqistance 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 di-zpyzvzsx fb5w s 3i*1k.qf/5s :u u0mameter rod have compared to a 2.0 cm diameter rod of the same length and made of the same matf/1fu w zzs:qm* x5ki3. bs5sv0 up-yzerial?

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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 me7 ue 6ykz* xm8gkrw1*.exgshjd /q( w:tals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficients*dz6d9/ cn qf:3fhssn*5 srm i 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 toa4uqkew d+-1y 8spqa*?

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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 equivalentsn f)/yikfl f4yo2t(9 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 circuifc1(u. )t 9x o3mk6 tjwixt+7vy6uog kt is doubled, the power dissipated by that cutfc u iv9m go)o7x(w+ ytx.361kjk6tircuit 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 circuilaxx fe*j g9 s1i.8p+wt of constant resistance is doubled, the power dissipated by +e f9pgal8wi* x. x1jsthat 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 constantv )*nfw ew:t y0 .qee iu6i6m945piaaeys;t q2 current flowing is doubled, the power dissipated by that circ am.9w0y* ;4iet aeine:qw6y vtp5f 6q) eusi2uit 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 offw, e; z7(wtcfe (b5-rcbvmh8 constant resistance is doubled, the power dissipated by th 8(e -cb, we7mrfft5(;zwhvbc at 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 is reduced by 5.0%. By what prcg+xo/6xze -( iv0 d;pcyg+a ercentage is the power on a resi-rci ggy+ ;eadxz+0 x6 /co(vpstor 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 ju2(*njm: ditz-2f pv 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 carryi hw6e zhuxq:.s0wvj q) 0u)8gaarv7(yng a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smsegq u ww) va vzq8ja 0xhr):hu7y(.06aller 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 essentials iy uke8p:p pbc/r+0 )y/k*hcly zero at very low temperatures are referred )08/p+ pyukc *ikeh yprb:/ scto 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 chame2a sp)v02 q7c lg(ysrge 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 ku(zgp3 -*q w(u4qbe(j5rohp 3h jpe+an electroplating apparatus in 2.0 min. What is the average curre ubhpwh(q( rpj j5-ko(3z+ug ep4 e3*qnt?

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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 0.50m-nx:q.v5ffe c 5hj*s 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 dw7cp5fh/z3b8 ltkp) ae))mning 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 current, has been leg ,u(sbekvef uhy 5dv,.82 d/kmfu ;w7ft on for 10 min. What is the net number of electrons that have pwhfe v2g/v,d bu,.58du(ufmk s e y;k7assed 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 ofugo usc4s1 i*; 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 much silver? (The silver ions are singly charged, and the atomic weight u1o;c *i4 usgsof 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 diffea nw+rf :p4p4oww9p1u v2wd a5rence is required to cause 4.00 A to flow through a resistance pw52d4p4:arwf+w uw vn1oa9pof 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 it is 5.0+gzm0c jeu5 v9 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 curdyi l r*pu+n/irt (m2nt7m7 b5rent 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 itsgz:miy) g2cwe lgw 3p81ib6r* resistance zpmygi 2*1)c6blier3 :wggw8 ?

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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. .3c n y9+xas8e g-+sfhlu. ye;0sesq gHow many electrons flow through as+0x8h nfelec;ysqg e9s3+ g-u.y.s 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 resistancxet u6xh pa18xur3w9.w/v ge,e of 1.0 m copper wire of diameter 0.40 inch? (The resistivity of cx/ axwu86huex .,9rt1 3wegv popper 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 ar8 np*m ihp:f4 circular rod 1.0 cm in diameter and 45 m long, if the resistivi4: nh*fpip 8mrty 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 (resistivik* 2nxeb +uj m5siv4yq87c fi5ty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 wi,qjk rp(1ck:2 n yabj8re (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 i.7z,u( u zyvmuts 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 gau- c+:s)xq .hmz 5we/ anfjkq1ige (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity of nichrome iahw:nz)+/ q5i.scq fm1 -kjx es $100 \times 10^{-8} \; \Omega \cdot m$.)

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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 sg1/):iefdf l1ydr :g cm long and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 Ayi:g:ds gdf 1 e/1)flr? (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 radt9i2 ,coxj ):5io pyteius of 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 (resistiv25lwbm r u2ge;ity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resi:y*:fjjjr57k i(x ix7awr3 hcxv3p4i stance 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 resistivity of platinum ist wrp v h28f5 **yh2gmw;/yhhc $3.9 \times 10^{-3} /^{\circ}C$. 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+ narq 3eak32b to determine the melting point of indium. The resistance of the platinum kb32rnq +eaa3 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 ,5ry, n bze*hk$10.0 \; \Omega$ 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 uwy7ed3yw11gzxw4e4e 1cz9 b 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 wz4z-vfcs k/ ,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 lg( hk1:rigc8u ight bulb designed to be used in a 12k1 i: hgr8gcu(0-V circuit?

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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 iz;z fk) ;w c ;m(wz9i9sqihy16a/ujcus the resistance of its heating element? cs qk y/z)jai(im zwhz; 19f9u;c;wu6

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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 ato um69ic* 0gjd $1/4 \; \Omega$. 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 a7r*** )vxz x;swztmd xs*se k(t $1/4 \; \Omega$. 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 bi; u02( rgj91kopz dljulb. If it is used 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,orhn 5b+:cg6a(tem t4 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 itkb xryotl(y8fmo/chvg k164 3qac,:1 s 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 forlpqi73kn,pwjr0;t*j*/jfn d 8.0 hours, if energy cl3jq* ;ndrktwj7 j*nip/p, 0 fosts $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 8.0 hoursh)66o vvs:4 h8sybu8ct.f qrj?

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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 2.0 hours. How x,o1tk 2 ah,mpmuch heat energy ip21a ,xkt oh,ms 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 lbcv+h mvf8o *9rw6.u much energy does the battery store?*vbocf+6r9 lm v h.8uw

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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 8.0 ho8ijeh)i 3ufsysab m(-bzmv 7h*4r9q2urs?

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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 hourso;p)n)l xs;)x so7eja per day. Assuming the power company charges 10 cents for each np e;a)os;xj7o )sl)xkilowatt-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. uxr3mt-6ph0 i0 hours per day. If electricity costs 10 cents per kWh, how much3u-i60x h ptrm 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 airvtx/ fm(910gyq7bm ir-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 contribute to the cost ig (1yqrx / 97m0fbvmtof 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 on0 q/cpq4 dq.th 240 V and generates heat at the ra/ dqc0p4qt.qh te 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 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 )mtrijw;/ mg9$8.0 \; \Omega$ 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 costfv: :yossu3g9o7+t bx s $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 the0 s2bkyg;wlh9 rate of 2.0 hp has 60% efficiency. How much cur2bw h9g0k yls;rent does 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 ac power source. What rms current flovybal7 bra*z :8rz/.tb/f l5y ws through this de:t/ yva8yr7z b.bf5 r/bzl*alvice?

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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 cou 3gygk y .w3i7m2tlpqoui6 *)nnected to a 120-V ac power source. What peak current flows through wikmgut76ly i q2.u*3)pgo y 3this 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 j5l9 yjq4c rv6a 120-V ac power source. What is the peak voltage across this del5q96jv4cj r yvice?

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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 in.nck 0l/ /s slbr92igt can carry (in order to r/.c 2/nngilks0bl 9sprevent 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 cubic centimeter of copper is $8.5 \times 10^{22}$.)

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