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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://autoconfig.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://autoconfig.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 elect.kbniqis8 3st 3ws 8*fricity by transforming chemical energy into electrical energy isi388siw k ftqs*.b3ns 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 p)1 8gfi dr0pnzasses through a wire's full cross section at any point per unit of time is referrednigpfr z )081d 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 cuzjn;*9- d qmhet r3jt80e 7rvcrrent 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 6 *tn-/ed s b:uncz*47emsjqe,xdm)tas

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car batteries are rax0 -ov gv0nc)oaq f3gis5nue+d*0nl / ted in "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 w2d01v *.itp i/l6f* dnafoqx xire 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 wireo4fla1llh 2-05v wu dk 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 wiy2 t5 wbgj-m8yre 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 xo;u)b25 h(bugo2mn u;jr3 e ylowest 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 has5t22uk r88 li cxbg;mz twice the length of the other. How do the resistivities of these b2gr8 cumik2;8txz5l 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 lengtw) g:9bv g h t-(i+obz*x,nunkh of the other. How do the resistances of t9wk -vun +gbbh()x*zt ,:oginhese 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 haqrd / 10rusgk/s twice the cross-sectional area of the other. How r0uqr 1ks/gd/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 wiiqf6enq(er- qoxt8u sgl-2)+ res. One has twice the length and twice the cross-sectional area of the other2i leorx- e86s()g t-qfnqqu+. 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 zz tf:5b5jt6kis doubled and the radius is doubled. By what factor does the resistancek5zttz j:65 fb 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 have compared toww6q8(zwm3;2v3xv uz: vwg rc a 2.0 cm diameter rod of the same lec32 v83(ww:xzqrwu6 v;vmzw g ngth 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 metahc3e1rjw.n.h ls

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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 od*w63uu d 4baresistivity

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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 equivalent8mq c r 1xfxh,l v;5l3fp0w8urdg4gu6 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 6g(5pyil;itmo

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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 doubled, bk em-0)wz n5l(sw/zpthe power dissipated bz) 05e/s bpk(n-lzm wwy 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 of constant d ns ./,) y zurebvln)5vgv56oresistance is doubled, the power dissipated by that circuit wil,b zg)6.r lo)svvv5nd u5ny e/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 flowing is doubled, the pol3nsigj, :.xb* nkv4zwer dissipated by that3z : 4sjxnigv .bk,*ln 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 ciro7cm s:c;+axif vq:27ww 4 u-ht9 hidkcuit of constant resistance is doubled, the p 2htiuq7k- ma;:v hwsd: +94 w7fcicxoower dissipated 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 deman/;v/ -p5 (3 zni :nj3 x,jdmbslnskbegd, the voltage output is reduced by 5.0%. By what percentage is th;-l :g3m s/piz/,ebxj(j3n dnvsbk 5ne 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 time is referred .u h:03 9 -lkz.ux6wtfdtvkqj 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 3.0t-bfjsq *yz :-i,wi y+ej,o/ q A. One 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 wirets,i:q -o,wz/e-qi+j* yby jf 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 essentiallyr;v(h se0-jf/vc oqq5 zero at very low temperatures are referred to aseh5v- q(qo v rfc0sj/;

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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 i.+ msegpdb)d lsj-,k-f 0.67 C of charge 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 electro n9 nyjib0 re09z0h0xoplating apparatus in 2.0 min. What is the average curry0 0x0z0obern9i 9jhn ent?

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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 t vy.3 vcv(1ths 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 flowrhq80d6 .x1zgy t,* gwf- dwua tgr3t2ing 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 i: :d:e,j 4z.zm -yi j7zajohx13.5 A of current, has been left on for 10 min. What is the neze7h,.:dj i ijzmaz-:4j:x oyt number of electrons that have passed through the coffee maker?

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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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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In an electroplating process, it is desired tone til/ tpy7z;.n:xz8 deposit 40 mg of silver on a metal part by using a current :7enyl/xt p8ni.ztz; 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 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 thr 8qv dczm:4- t4rf6kvqough a resistanczfqvcq 4 8td6r-k4m:ve of 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 re:sy( xf-y/ahfv9j g nob)z)3 h29zm zmtn,yg7sistor 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 2206.ht8i vlqee:. ddhm .b3- mge 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 draws 1.40 A of current. What is its resistanb9 exl,ogxjyw07r *9wtg,v nu8kh 2(cce l0,gx wxy8g,* u (bt7ovrh2wn9k9ejc?

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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- 5a zi8.0xvo6ik wx/a5y rqcy8W resistor. How many electrons flow througy 8iirox.0y6v q/ck8aazw5x 5h 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 1.0ko4ixa-vm zlu3 1es2 4 m copper wire of diameter 0.40 inch? (The resistivity of ku4zxevl32i4o1s-a m 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 r5 hayuxe8h4 tya l3ta g7.,(ufod 1.0 cm in diameter and 45 m long, if th.aa8hhxu lft 4ua ge,(3y57 tye 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 wqn fd1 . ei3lb)5ebhj1s9j1naire (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 (refi4u a 3t36pqot 3nr5psistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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, measuresd6dlm;ss c1j(2k dv*sra e e7*(uj: nr 0.040 ohms. What 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 0knbuxd33f t2 0.321 mm) nichrome wire if it is connected to a 12.0-x0f bktd233 unV 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-section, zns8 f e 3+prytwt+-z:1.0 cm x 2.0 cm. What is the voltage drop along its length when it carzsznt r8f+t3:w+pey- ries 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 radzi qf q6u9 nu1gd56wj/ius 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 (re4ff*pj2cr pov(:a6 z g*b u,xtsistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 w k*fz5l3ielizlc*0+3aqx x26z lx0c $18 \Omega$ 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 j) 7hixk4cc0p 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 j q/)c,qseo-odetermine the melting point of indium. The resistance of the platinum w,oq/ s-coeq)j ire 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 a qguv+ dw+mat5)5nz l6n $10.0 \; \Omega$ 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 current will it dr 5-)bv 2szguj6twd 9ndaw?

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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 113)k f+ tczb9.3/he.znwioi)fr lm,zba:hq r -0 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 lightx58g+ ostah y6 bulb designed to be used in a 120-V6sxhy+gat8 o 5 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 resistanozbqbs26 )/e b d4a0.7v* qw iovdx*kgce of its heating element*i q e0/ bvs7d.b kg6a*xodbw zv2qo)4?

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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 ratsojlv+;-j8:n n xrk:+ 2kohkged 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 ratedf2 x.,;w-lyl /a dmfqp 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 currentfcf- ;. t xwz-7wr3/xcmkw.bn2t el/w 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. Ifod0 4: itn jrs).p2kvq it 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 110 x5;xfmr74ajyV. 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 03pjd w 00y5s wxdwoz+d; s:vrkj,k;j for 8.0 hours, if energy cjjx ;+r0ojv zywpd:d;dwk k503sws,0 osts $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.;dy jn5.azr y(hlc(3 w0 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 2.07q3ozf1nyo)i ez -2ec hours. How much heat energy -zci 3ye12) qfozone7is 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?(ihltmzc6p90p*znv8( +h uab 8(9nz0(bt*+ ihavmp6 culh zp

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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)u+upvgb gq3+.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 1vv19;.vsxj r+r e0j2dxans f per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost tex0sx+v1snr9v2;fr j ja 1 v.do 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 m5icr9* l2kbywonitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run tr2b*i5kwc l9yhe 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 rg r/exr3m bcacv ;dg ll p9 .8e13cet)qh94:vpunning a central air-conditioning unit for 2.0 hr/day at 5000 W, and a3bvex l4/cceq)r9v:de;3pahl8 g1.cpm r t9g 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 generate7s b8crigy3s, s 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 will the repair have on tryc 3i8ss ,b7ghe 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 /( 9bmr -tfd5v4leu ngthrough $8.0 \; \Omega$ 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 a 6c*kr(u.zskmwe2i 0$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% efficiency. Howo 6k2of6)hbixe zl*r ( much current does it dr 2e*6f lr6booikx h(z)aw 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 cu f.gvyubp0u6 ,yun.a y-; shoyk* /8gtrrent flows through this devic/ ,vn0y bpyggu-h.yyf8kt ;. 6uo*asue?

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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 a;h4mh y:(-q hxbcuy6y c power source. What peak current flows through qh ;ybhymh6y:c-4( xu 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 1204nukz5iiraq.(l4d o5 -V ac power source. What is the peak voltage a5kii4z4 ruqn(5.lo dacross 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 madiwle/p (.b e v46io8:wr,pn06 qdlrjximum safe current it can carry (in order to prevent fire danger in building c 6drn.4oe ppbl 06,wlq8ii :(r/evw jdonstruction) 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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