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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 inemtdcb9jw53*xl v4c 6to electrica*vewb64jcd39 tx 5clm l 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 se:a 6asmpep7rsgb,9 rp4 /4xgtction at any point per unit of time isas ,g9b/: 4ap6rsr7 gptpx4me 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 conventle0 gg o3nr7swp0z9 (yion 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 same ast*ev4ntnx*+-e4ad g1s yns*h/hvch(

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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 "a ;g0b)mlj q tkmf+e:2imp-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 wih+ f:kt26o jjtre 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 gdc y e.x)o0eg8 m.; (f nff0uld/r*li*cop .dwire 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 wl)r6fys kx 8lbzd:qnb +)aj7/ire 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 value?re1*-+t xl2de,/ +nywamlcl h

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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 the r pnoc)6w p55tkeso c5kpw)pn5t6istivities 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 q b:4 dpc-*t ccm7zk;aof the other. How do the resistances of ;am b 4p*dzcc7qk: tc-these two wires compare?

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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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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wires. One has ulco o23)g*9yj4rul ftwice the cross-sectional area of the other. How do the resistancj9lrulyou 3c*)2f 4 oges 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 length and twice the cross-sectij*9 q,tjz 6qxmonal area of the other. How do the resix qjq,m*z t6j9stances 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 jiru40obomv 3fo 68vntoyyg8* :n:,s . By what factor does the resistanir6byoyj8ng0fomvov *348n ,:ous:t ce 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 diameter rod hav oeumrx - 7(2udb4i4a4v 5axtte compared to a 2.0 cm diameter rod of the same length and made obtr(o x x du7e i4aa5u2mt4v-4f 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 metals.lfh+v pi83ym

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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 resis/3sj6sk dam ggy:n 6,kkum,y-tivity

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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 7wpqc jq vhg+ .zza194to?

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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 eqep/gl b()k *h wlb86kvuivalent 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 voltav;zf7 p.vud3e m6n4mbge circuit is doubled, the power dissipated by that circuitvfnbu3m 46e;zv.7 d mp 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 constrm 4x))0r o6ni0qyubaant resistance is doubled, the power dissipated by that circuit wil y)n6rbmoi0x qra0)u 4l

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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 dou03)iifyav *f ebled, the power dissipat03if)yvfi e*a ed by 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 resistance is douby:sa4:ptxb3;ca n 2 q)ax0frkled, the power dissipated by that ci bt2sc;:a0 x:f)ya3k4xpqnra rcuit 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%. +bedm * 9p-9+ajrswobBy what percentage is the power on a resistor affectedob9- b*d+wr9jm+ apes ?

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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 te./pnw6 r2 ).x28gujdddhrigo 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 carryitz;9e 3 sevf*gng a current of 3.0 A. One wire has twice the diameter of the ottf*9z;evg3 esher. The ratio of the drift 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 re wua.:l8wq2b:az8phasistivity becomes essentially zero at very low temperaturesbq. p8aaw:w8az:2l uh are referred 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 charb(un6cnh4w -.i-m 7*h*x om jtuh8vps ge 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 an electropla1 ic*(q w-ct6mmul9ofkr orf3p7- :hzting apparatus in 2.0 min. What is the average currwoh-(9c 61 *r 7-pqr3:fc tuozlifm kment?

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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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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.a s6ix-- yken4evb9 )k50 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 1vddj p6c+46(va2y:m fj+s-xk jxxivif $4.0 \times 10^{16} \; electrons$ 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 Axo9:u4dl,nnd of current, has been left on for 10 min. What is the net number of electrons that have passed through the c9xlddn 4:,nuo offee 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 sil2km *66 hhwpp m/9nhztrxl 91dver on a metal part by using a current of 2.0 A. How long musm pr1*9lzpn mh6 hd/khx6w2 9tt the current 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 through yuwcb*( w-l+e0sj 2f /ace6ng a resistance of 330aw/cu ( sng-+lbe*w2f0j6 yce 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 3 t:dcqt+lfh jz:n*x1is 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. Whwp : is ;v,3mum.1mvobat current will flow?

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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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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A light bulb operating a 6xeweo kc3al18to;gsrtr :d11*me+l t 110 V draws 1.40 A of current. What is its resistanceg;ooem1:+c1lret8 r a3kex6t 1 *lwd s?

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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 oeu+k ;5c:pesa 100-W resistor. How many electrons flow through the w; +e5oske cp:uire in
1.0 min?

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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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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 resistiv.cx-p b r:p)vkb.e-jno*k8q g tfd-1wity of copper i tq-kg1.) on8:x r.-bjkf *dpbwpv-e cs $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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,b5tzwyme6xf6 0./xo b if the w y6mbz/0.xf6b xe5toresistivity 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 wirf x n/y9(thue;e (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 (resistivity en ebg4-3-rmuihwgy4*webq, s81 bz 8$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 res18f(j ysqyg4,xs esb-istivity?

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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 kt l3 vvtw42:k0p bhv/is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity of nichrome / pltwk3 20htvv: kv4bis $100 \times 10^{-8} \; \Omega \cdot m$.)

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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 anr6efk dz:1d mx f9(c*yd of rectangular cross-section, 1.0 cm x 2.0 cm. What is k z(x:yc m1*ef9rdfd6the voltage drop along its 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 nich lc5lpo* yfn 5ivpt7:4rome wire 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 copper wire (rz*w3 ,ogy 3yhp 0-hmxn ln d5ye1sz-g7esistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resise 7* 07r)an:uiift sqckn c8c235szjntance 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 wv +.t 2yagos2of 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 indiumyca3 41,z/c1m6 iyl.f x/gov9q uyi2gfaiz+ x. The resistance of the plati/i+y16ci4yfm. 1y92gxf/ zi3aglcazu ,q vxonum 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 thpyk;f 4pd ;nzj,h/ by:rough 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 xb719c2(fcn1em hfco 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 l7 *n e8xq gq1cm;hff,110 V draws how 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 designevi m ubx)0d75i/-*eycc cxv+cd to be used in a 12-ccc* 57cmie)vx x+uyd0b v i/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 is the resistance 7xkly/z* e:3y+bukzm0k:ra 7j1 auq zof its heating element?b r*l xky7eym +3ua1az q::zjk/7u0k z

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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 at rfpc0r m 9ahyjanf8jb.915/v$1/4 \; \Omega$. 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 r,w3v fksj;(ey/ bzy (qated 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 bugiywu9 k 26oat mt.j+ndg1/q0lb. 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, w x9d*f .7kyqfd 67manqhd7uz5(tq)hh hat 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 its resistance?4ege0k85ce* s7s nka a

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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 solderinsnlaw 7ad i424j).s uwg iron for 8.0 hours, if energy cow42 dna i)4jsl.usw7a sts $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 d c3gxo h-rd43ol -3g.daxzz0bulb 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 c -pt8 gs-ihwb0onnected to a 120-V line for 2.0 hours. How much heat energy -b0hgti8ps -wis 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 mmva nz)u ir94 w4bkrg7z9w(:fuch energy does the battery store?vz w4w9)ng 74( abu: r9mrfzki

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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-Wqj9/4 cc7ggkb 6-)djxw8lnm spo*s)x 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 lightp/ew 97fx,8lgg9mq cb bulb is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used,p87gg 9x 9qef cb/lw,m 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) 56exd d1uedf(is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run t1 d(6ud5e xedfhe 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) ele e;7i9popirpz npkhe7 3o: .t1.gjpc*ctric bill included the cost of running a central 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 cost of the monthly electric bill if electricity costs 8.0 cents per kWh?npp;.t.egpro17793ip:zocj k hip e*

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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 4vulof 6i:t1 v )5bkpr240 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, the resistivity of the wire will depend on its temperature.) What effect wil vok1i ) uvtp:bl6f54rl 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 tc2 h e:hvn/ad7: lr2xzhrough $8.0 \; \Omega$ 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 8w*gw ki,o -fbc,7xtj)m-sqqc x ;yh3 a4 o6so$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% eff5f 0x 13-w gxs7pcgz f:gt4 z)tw8hdrqiciency. How much current does it draw from a 120-V z7f1c tf5wx g0h3 t8qgdwp 4zsxr:-g) 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+zcw2 b yew)/vi 36bx3nms b*w power source. What rms current flows through this dycww+*bw263x in zb) 3bm/vseevice?

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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 flown pio1,d8ql6kc5jx 5cs through thislc, 5j618odpn xckiq 5 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.mhn0xqi* kpq15gh 5h 5 What is the peak voltage 5p m gqh0ih 5xq5k*1hnacross 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 max tc5 rphy3/,cj i(xoht .fs,a*imum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drif th 5o/ch* ap(.ix s3,fryc,jtt 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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