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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://5edu.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://5edu.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: admin  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 into eleqshw uio )t.1317oxaza 8 qd7tctrical energy is calledo )qid8 tqw 317x1au.zoash 7t 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 ac e;y nz,y+y0ut any poiy +u n;cz0yey,nt 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 conventioo6bfo4xvzn/nv3b lsq)18yie1. - g vfn 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 /baaul g kmafb92+s9gr 0wis79,+q fz 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." Thiuvq5qm8ro6 il503 qu ts 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 dgl y 4uy6yzfo1qlc2;0efined 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 1s+3ips1wr/9u ctr ifs

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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 des d6udxo6we f 6iy,3n.pends 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 value?jx,0 3 q y )rc(kxexz-xhx+en.

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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,1blqkl0qoyr,;zjou 9 9scy : the length of the other. How do the resistiv 9,r: y sjyullb;ozq0q ,ok91cities 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 n89t yfjq3tz4/ r/gfshas twice the length of the other. How do the resistancef9syzr/j3t8 gt/q nf4 s 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 twice the cvg , xcni7zdi4h.os07ross-sectional area of the other. How shci7,o xv4ni0.z gd7do 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 wires. One has twice the lengt(orhg4k6 xembx2 c f4,h and twice the cross-sectional area of the other. rmxx6eb g,f2(c hk44o How 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 radip vt l-5(ywfu;us is doubled. By what factor does the resi;( tp-vlfy5uw stance 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 resistancevc bd-6t k,gj* does a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and made of the same material?b6vjkd* tcg,-

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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 co3a86l/ywm- 2/ pdlpkd erg)uh(vizd ,mmon metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature cv+v-n; mjgmbm6q* gt/ oefficients 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 equivaletdawuh46h+ + tnt 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 equivaleng1ckvf pu-b r2k,txu-c ih nyn5f)71:kmgx) 0t 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 circjr1swj)csfm .(; tg w)uit is doubled, the power dissipated jw.1m)rj gw;( ss)ftc by that circuit 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 l*nya3gmg*k3g,w 2to of constant resistance is doubled, the power dissipated by that c3 yo23tl, w namgg*kg*ircuit 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 cibdan.bly65 tp 98jyfsuk*8/r rcuit with constant current flowing is doubled, the power dissipated by thaa 86tl 9.p8srfkub*yn5j/ db yt 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 o08 bda( le-7ksvxs m)zf constant resistance is doubled, the power dissipated by that e (bl k-xa 7dsz8)m0vscircuit 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,4yee+xp se lpmr(c 7s.18hw: w the voltage output is reduced by 5.0%. By what percentage is th(748whwpermxsp .yel1e :s+ ce 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 to tixj/u 70.oo 6qocygke x q+m./v( rj-tbme 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 of 3.0 A. One qtx+/iw xdn 9px6f85p(qsre- wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in the larger diameter wire w-xqe+pxt f 8srp6dx i(5n/q9is

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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 essen(en, wi izwgnt, g8o+r1t1mf2tially zero at very low temperatures are referreeg1 +mnt8w,ot2 igwrzn f( i1,d 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 charge pa;- xkzo. cfi eegkv(+0ss 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 apparatus uljh;0rs7ud/e4kcb2 t: 1wyb ltqs:- in 2.0 min. What is the averagedruhj/sw:kq:c2ly0; -1su4 ttl bbe7 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 wpni hjl;3-0ixjmj ;w2:p ;vkin 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 flow)vjl f rbpbagw*+ k4.jqc9m+98u7jye9tf6 wq ing 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 drawnsyzxt)+ /wk+ s 13.5 A of current, has been left on for 10 min. What is the net numberkn)t sw+x+y /z 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 de2 nc4m*heigwcby d:qea -6)wlk7/m1 bsired to deposit 40 mg of silver on a metal part by using a current of 2.0 A. How long must the ce1)274c b qcbmkm6/ai wn -ydhwge* :lurrent be allowed 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 throu/f(v+;r-0 e wmgtl ynugh a resistance of 330 W/;n g v lter+yw0(-mfu?

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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 resis q7y5668e;swe +fs7vs euo1a*x a t:a(jlzvuvtor 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 .f;itc y096xa mb46yq js.trt. 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 drash6thm : ,t8puws 1.40 A of current. What is its resistance6t,mhu8 pt:hs ?

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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 elecj7cx0swe durb3 , hu.;0lv7k ytrons flow through the wir v xk7cb;d j yreu0u7s3,hw0.le 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? (The ble2 e2ruum 6sl/34m hresistivity of cop32u26ue4remlbhs /lm per 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 dia9r6s3(baocrbjvl;t f5e2 i )cmeter and 45 m long, if the resistivity c(o;cas)r95je3b 2f 6vt bilr 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 wireknw .;nn6,zhz rt89bc/t4ghb (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 (rea- mtgh:vq9 u4sistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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)gy p6s/evd b-r* bzvh2pxl7 04 +tcuq?

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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 yy hmz8fsc+5 ( 7wuikplfc5o;3 m/9rjge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity (3pirzy5ml/ k5c7m89 o; f+uy fcwhsjof 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 n j am(4l ae2xpp4b2*elong and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along i2e p4lmba*a4e( 2nxjpts length 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 wire has a radius of 0.50 mm and a resiszziuu8rf fe)hocki+)*c7c3 2 tivity 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 (resistivl7wvjbry,v/* 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 a4bbr ,;ipo n0w 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 of 5-a5jkpmt) yqj7) m loresistivity 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 rewe6h7ekae rrr/k2*zcv0 ,e j5 sistance of the platinum wirrk5r*hck v6 wa,eree 2 zj7e0/e 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 b7 n gm,hetn+ 4*,tlvoan $10.0 \; \Omega$ 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. hwd. wq39bp*r 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 + t7o4 s.ki;eeer0okzcurrent?

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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 torj n - nre8:8x1kfy/hl be used in a 120-V c/8xl 1n f8nye-rj:r khircuit?

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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 resista ccc/v 5spdy-;mwf+ b3nce of its heating element;m/fby-s3pv dccw 5+ c?

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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 aipi3)+ rr 3hbgt $1/4 \; \Omega$. 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 ra:mv(,qjj)z 5l7v i0ir dbwx jcs46 n1yted 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 ith cts 3cnzc 2w 5;/h+d4:4 fp g59vs:fkhyhzol 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, 7w4e7os rp+8ll,6xr; vum1 secke b;awhat 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. Whawmd b0pro,z:b)kb74 tx2/ ts.uqno 7 ht 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 hovc+ 2 y-npk0vturs, if energy vvck-0n2p y+ tcosts $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 libj,sn 1cxxy, b)x d,+kght 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 line for 2.mj9 ml63 q 3d3zw-uojg0 hours. How much heat energy isj- 3m6umq9zj3 dwol3 g 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 the battery store?*l; sa28t xv4ojk46jf7k cm.vh kirb* ki*v6kj .akb*f2 m4v7l84oh jx s;ctr

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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 8rca8zlyug4i2 4 oz 8h-.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 3b0-6wy ( unzg6hoz wapower company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual yag3 o whz zbuw6-60(ncost 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 mon eqbkj7hfi-2a 6 (7dgoitor) is turned on 8.0 hours per day. If electria(ib2gjf-7k6o 7heq dcity costs 10 cents per kWh, how much does it cost to run the computer annually?

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 runocfm4,o)yitpdr 47 bna 5k1;zning a central air-conditioning uni cd m 4at)iopby4oz7k5 f1n;r,t 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 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 gen0g-ls a47ebv /h1g ajeerates 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.) Wh0-71j levhgabsage 4/at 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 flows5 :lkxa6m;ajhqlif(r :r)s q x995ss8b7s uyz 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 costhm/e0:hcfk -c6hwj, 2ny un s.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 the rate of 2.0 hp has 60% efex k-mu3dck 8t qj 16az1m;5 rq6b 7d-rj8tkvgficiency. How much current does8q7x evt5mj1k6;cd3 6-1-k jtgd rr bmkqazu8 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 flowl-mjedl- e 8zp+pz +y8s through this device-jl+ezpmy8e -8pd+ lz?

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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 s5 63q emd uodlx9wg0u4ource. What peak current flows through this devicqd eodmuu95g64 3xwl0e?

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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- ybi p*zcq5nxlddpv5 8 +f9a(4V ac power source. What is the peak voltag5(9yap45 qd fidzb *vcpnl+8x e across 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 copper wire is 0.081 inch. The maximum safe current itwh *r oq.5yvct gn8wpx5- r25j can carry (in order to prevent firn* ow5y- p25vx85rgj.r t qwche 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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