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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://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://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 chemicl4 jr3n,*gd8-i 2;bnbprx qij al energy into electrical ,lg-r p4xjbni *rnd23b ;qij8 energy 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 section atj f67d:, ll y m)y,xt acdl3hw5:d0hnt any point per unit of tim tc:h,hd57:yl xnt lf3d0jd,wam) y 6le 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 toyql2c.utf e3e+;j :y q 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 o/nv.hxfe 0 7jthe 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 is9o(bvr yq-n,t2sj ,q r 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 defehw,kx1b 3ttu vu;/b j/ap a/1ined 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 i )o8 - mzeq2 1qvt8bp:gz2grjrs

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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 *1 p5odbltos- wire 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 lo2(*;a-r 4c8wsm/uwdsn(,w x p *yia)a uv nqmbwest 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. How do thl) ibng8ic;qu1 a*4 (vl 9vjkae resistivities of these two wires c* v k49vl1ian 8jq;aglbiu()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 lengty 2 037o-ya1acnsorwj h of the other. How do the resistances ofnr-o yoasj3y7 2a1w 0c 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 twiceidtg8do 8;ju /cd:k1j the cross-sectional area of the other. How do the resistances of these two wiresg8u:ocjd; j1k d d8/ti 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 tw3ypzeb2 01fuqke,uyny(nu, 9h0rs 1cice the length and twice the cross-sectional area of the other. How do the resistances of tsh 3yy2 1zy kn, unpf0ueb0 cu1r,e9(qhese 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.6ii85z gu, ob)o.kq4 1kwzthd By what factor does .,h 8g6z 5i) 41dootq uwikbzkthe resistance 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 diameter5un( zms (eg3r rod have compared to a 2.0 cm diameter rod of 5ms(e gn urz3(the 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 mo0noe8ffkfmx):; , gzpst common 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 resistivgn*rmktgd ) 3z0j2l4 rity

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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 togts9am+o- lbd1ts2y,.j- fjmzo.l 2m?

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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 equ26u *hkj 24obuqjxue) ivalent 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 voj8) ih /ctib48fbjr 9eowy93iltage circuit is doubled, the power dissipated by that cy)4ficjo9iwtj /839e8hb br iircuit 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 *(q(1 (tcnkc4x xm- dl)3/ bziygb vlsresistance is doubled, the power dissipated by that circuit wziqxy */ c ()-bm1nt(xgl3l kbcsdv(4ill

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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,pn(5:hhuy e vd, the power dissipated ,:p vu hne5h(yby 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 resistgixm3y *tqa..vo4d ;a4 m vts-ance is doubled, the power dis4aym* 4xgqi -v3 tatso.;m.vdsipated 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 voltage output is reduc4 zhg+ts)o mtde3r8 f7ed by 5.0%. By what percentage is the poz7dgs)hfottr 4 e38m+ wer 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 m33j 5hcue8 tgwith respect to 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 ofb)b np:xe3vh (dz zjp0,*uba1 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter ,bd :zb p(p)0 bn3vx1ha j*zuewire 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 becomerlgs)pny t0,e. b 7sd/s essentially zero at very low temperatures are referred t0stg )bny . pdslr/,e7o 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 pasguqd5dro)f 8biu,8w+s 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 apparaia cua,yc77:csh .z j80c) ueatus in 2.0 min. What is the cu)eh0 i7ca 7zcca s.j:8,au yaverage 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 pas17 2 hr qemots9r j3ne7xpicu4sx.p1;s by 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 flowing8p+f,i/ q 4dswxa-vfb 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 bznv lr;7t gg* j) )y4i7tq, (*rtlrmlfeen left on for 10 min. What is the net r)7l) l7g4ntjmylvr ,tzfi* ;rqgt*( 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 deteghzy4;r-mq w:v02si1m iw6 sired to deposit 40 mg of silver on a metal part by using a current of 2.0 A. How long must the current be allowed to run to depsmi10g-zv 2h ey ;m4q:ww6itrosit 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 p9y6vxwwgsfoc ,f 8v-9j3t0qto flow through a resistance of 330 xc g9-to,jw9f8w0vqfsp y3v6W?

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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 thes5 (.umxepl6m 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 *h6w nobn8 /lu;8jaxyrw+n0k 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 dn)3awo*y/ uv eraws 1.40 A of current. What is its resistance?3y u*oave/n )w

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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 rz;/0 rbj8ldmlw0chx ;z1(axelectrons flow through the wire zl lrrh;0x1b;amjdw0xcz /(8 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 wegl3 vtu;u7 d4k*ufr2 ire of diameter 0.40 inch? (The resistivity oft;7du3k4g euf2rl *u v 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 inn4cdrm ..fmg( diameter and 45 m long, if the resistivity imcgn.d4m.f r( s $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 wir 10-mzlqnjo5lu;x. h dnd)s5be (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 wiaeyk afi.)+-b hxz) u.re (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 resistivity*oh3w dmt,tp)s41ih k ?

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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 10.0-1d:x 08g6ivbj ku 0n,w r+wugcsqnz :.m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistzw:b60vg:c d 1qun, x+jnwi0g.8ksur ivity 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 rectangularmj,;8fbsmmo6od-r4z1xuw 1 f cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length,mwz m6ousb-xjo1; 4m8 df1fr 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 wire9b*ro+nb t2 ruhv ;fb0 has a radius 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 coppe +i)p6p ee j2eeh2uw5sr 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 a resistance of x2pr/gwn*t25 c.nuk w7ga.gb $18 \Omega$ 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 is : t(3mvp;amc k$3.9 \times 10^{-3} /^{\circ}C$. 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. T b b2uwwrh 1 kdyve666w11y.mwhe resistance of the platinum wire iswm66 6 ywbdhb .1wekw1 21ruyv $2.000 \; \Omega$ 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 cg f(.xtug 0 -7sdl+fian $10.0 \; \Omega$ 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 au r*k;gf2m:lx;*r sw. 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 howbdvlft sub/ty 5865z 1 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 defvs9)sc l jx6d;)u ijs6t.6zasigned to be used in a 12sft)aj;69u)lzjsiv 6c.sx d60-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 12jx *wdmv 8o-p50-fq9/egcw n ehzrr4: 0 V. What is the resistance of its heating elemenw94f 8rp*-oehnxcejr5g0v w/d:zm q- 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 p+ims08epm f udu:.e(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 at f+l6f)u2l or fa 6erqp6x.9jz $1/4 \; \Omega$. 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;+yn bmvl x0+t zntyr +s,6ok: 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 1h+1qg(d esrpys5 b91l 20 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 idi d8/ 2bcaf1ro -+pwes 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 s tm4s 27uqjhy ct;3d b;n*;hpj9grey2oldering iron for 8.0 hours, if energy cost*ny;gym2qcs9eb ;p ; 73jdu4t2 jhtrhs $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 z683exxrca2.bln6 v x0wf*3o xd,gzx s)jw7oin 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 line for 2.0 hours. How much h 52ek,ay3hf h -gsd0aveat energy h ,y-e0vha5a ds32kfg 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 at 12 V and y,wk)rz , ,oaws sd3)tv5;azf160 A-h. How much energy does the battery store?; d,v)rw3kz fa, owzasty 5s),

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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 u2nng-:8 hqzrth7kz 1ose 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 pza0 wyq+o)4hprlg dm27 r v-)lower company charges 10 cents for each kilowatt-hour of electricity used, estimate the annuvr zlalyd q)2wm+o0r- p)h 7g4al 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 monitor1b qg6sj zclz 7m8 e/,nwzjl3/) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh,ng/7e1 8wcbszl/ jmqj,6lz3z 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 cenys.zdd:c/3 d dtral 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 contribute to the cos 3sydd:/. ddczt 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 electricev6l-c5ri 4 l6wze c(. cwl 2x,ko/ntu drier operates on 240 V and generates heat at the rate of o tk/elc( nli5-w2 we6rl4cc.xvz6u,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 throughxfcw3 os 9ck,+ $8.0 \; \Omega$ 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 cost6nr4v ,fdzohr4fn 13js $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 oxscpl i0d -0 )apa4c-has 60% efficiency. How much current does it draw frcxpls)04 p -dcaa o0i-om 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-j2v .4 aw wgqr8f45q9y mudtr6V ac power source. What rms current flows through this d9 qj4ayf2 .mg4wwqrr5v 6d8tuevice?

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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-Vksb;4z/ps.s 6xe ( ccp ac power source. What peak current flows throu/zpxb64 esp ;sskc.c(gh 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 to a 120-V ac power source. What)fr dw8c9sva fc;3e +jugig:+ is the peak voltage across this v9cu;si :3f) +ajrwf c8 egd+gdevice?

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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 cog- knn :jkz++an carry (in order to prevent fire danger in building constru:k+gzjk -+onn ction) 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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