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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 elec r es6eno8s4eplx 7v:q;c x2w ..g-ixqtrical energy is cpeceq7s :q.x4 8l2.-;nwe sx 6vgori xalled 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 throuhz )vuv-*7 oslgh a wire's full cross section at any point per unit of time is referred to as*s lvzu) ohv-7

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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 takeds gr bl,7zz6:n 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 secondt3;v4e0e io5zr h,brv 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." This is a measuruikk)4+ kn po)e 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 67;l jxd( 6 v hdf*8hgvdxkzy/1f0ao ywire 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 wi2n:arst : s0f d;v1p bix9b4 bgpc6j1sre 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 wire dependssqhd-gko7, vrm0y(d7 zz/j (r on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting mateq,7-4f8u r qx+v*lfd 4 inqacwrial has the lowest 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. ux9sgl*z0whumd+d99caaej7uy) z 8s (oa 7 q2 One has twice the length of the other. How do the resistivities of these two wires compa +h 27qdc(ea ux 99 z0auw7sjalo)8 dgs9*mzuyre?

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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 /i)k em*2ub e3yeg f2lat2gx+the length of the other. How do the resistances 2b2ty+/fuexg2)3ee *mkailg 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 wiresfb v;xebb8-ji3z k7:u. One has twice the cross-sectional area of the other. Howbjbxuif37;zk b v:8e- 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 wires. One has twice the length and tpmj5atk-:3 hx0,or0g jt)ww( n rpsz0wice the cross-sectional area of the other. How do the resistances of these twpjx n j)kwt rs:to00-5mr(3 gzph,a0wo 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 radi- ee j5pgji/3cus is doubled. By what factor does the resistance ch 3i- 5e/jgcepjange?

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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 compars(6w+qv u-;h+nn m+jn oo/vyqed to a 2.0 cm diameter rod of the same le-6+q sw;mo/v (+jnonn +yvu hqngth 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 mosth*0wfj p.9xnv:u- b mbn;5cdp 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 resistivittsuohxa 9;g r,dp136k y

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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 equivale +jlz:f 1fotg;h2)3gj pkyawa,1our6nt 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 equivalen)h4 -gkaq-y k (,cq qa;rd*9k0zuufklt 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 circuit is dorxoxniqj 2rb(/,f-ww5ob - s6ubled, the power dissipated by that cirnixb 6 oqxj,2w5o-(frb/ - wsrcuit 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 resistanceh0)j,1w amgzn is doubled, the power dissipated by that cir,0zna)wgm1h j cuit 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 constant 3 5(1ihgqrr/s 4rrthg current flowing is doubled, the power dissipatedt/r rsi rghr45(h 3gq1 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 dfw fj2lz,l2 +loubled, the power dissipated zj ll f2,f2+lwby 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*if,sr vs *6ig(n 8*a-meh.g/zqduc y output is reduced by 5.0%. By what percentage is the power on a reshygizg,. srnisv6 *ma * dqu*(/ ec-8fistor 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 r m40mcal n b v-*s-3vk:gij;mt wfis9go3w7e*espect 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 of 3aak 1:hgf(f(w c*n+ gt.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in thfn t(a*1hk(cf+g: wgae 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 resisti4xy s(5hklh9nne8d1/rppu z )vity becomes essentially zero at very low temperatures are referreu npephr8d ()4hl/ k19s5znyxd 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 pass a point in guu6hyh5 d q7c )ta9*t0.30 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 througbtdb,h;ie 3qg726v et+b v* nrh an electroplating apparatus in 2.0 min. What is the average 2eernbht7 *3d 6 +bvgib tv;,qcurrent?

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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 4u5 vad(:ewzcvv+e(y 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 flowing 8j cv93l2c j3g7jd,m7h othjnif $4.0 \times 10^{16} \; electrons$ 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 curr0h4 ;a;d uw) fra zqt7uwr93l s;y4fqrent, has been left on for 10 min. What is the net number of electrons that have passed through tu4; f tusr aq7h) q09lawryzrfdw43;; he 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 a9lz.-,+cgr lx9i:du4juyhbb-, de + us ej, vdeposit 40 mg of silver on a metal part by using a current of 2.0 A. How lonc49-veja9 ,jez gbd lyuh ld.x+,rbu ius, :+-g 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 through a e 6i/ygjjju5d(x9qi( resistance of 330 ig9e y5(j(jdu6/xqij 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-p,e3t.p 6-;hrdrtpw xW resistor 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 connect vktgici4f49b 2 i0msm 5awr:r2f;t e;ed across 220 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 e7t/7zsvb ;/kz1g j38eepjderesistance?ee j/ke7z8jst;3g d7b1/e vzp

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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 electkj g-:1dn kv 7f)6aowarons flow through the wio)jna vkfkgd 1aw:7-6re 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? (Tfzbg k,:r/0qbb(1jjql1i c+the resistivity of copper i/+gbcj1qbztri kj: ,01 bqf(ls $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 s,kfs8s; r (qch2bjk1in diameter and 45 m long, if the resistivity iskskf;(qh8j2 s s1 cb,r $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 (resistivity x,b40sf*1oiyl i:r q8xqbi*e $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resist/9pk07pm 6kdeh j61sx csu6 vrivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 lohqlq7vkhlq5gz g3i,m*k: 6 1xng, measures 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 (thfz rt0dcype9h)r+j2-e radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity of nichro 9yt )ecp0r2fh dj-+zrme 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, 1.) ozkft8v70fk 0 cm x 2.0 cm. kv 7t) f8kzof0What is the 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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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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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 9emjwqsbj n.r 2/ tb7-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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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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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-mm diameter copper wire 92. rnrxmkeyn ou6av b+c4zkyc75e 7( (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 resistancnj0uaqnwg x: b-/-ns 9+5hv dve 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 resisti o (3srl8s(gc mqh-/na;tqgs5vity 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 d3p, up2uax*sm etermine the melting point of indium. The resistance of3asp 2muux* p, the platinum 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 thald1r85 h* lekrough 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 1200 W. What currentrocc 5ucaz27 0k.oul wl;1n6-on wqc; 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 )h 6 (n wqrq(0:lbk;0kcqyjli on 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 designed to be uz8 wd2flz7r/ used in a 120-V r/8lzuw z f72dcircuit?

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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 of its heating elemenyxx c:20j u/auta 2x:0ycjxuu /?

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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+29q. cvgfx ib 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 rat egrf+ 9b3kr-oed 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 current does4xxbwywc7icp03f0)9m y d9s z 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 is7-iaahot5s l8 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 V. What is its resistancx.-gt dohc/ cz+mo o)9e?

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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 operat(t.7poeq lf o+oj m9w-x*z1 xfe a 25-W soldering iron for 8.0 hours, if energy costsmp*f qj1o.lt oe+f9(ow7xz-x $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 vh;/ si+f:erb 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 lin:u8hnv i8ana6 e for 2.0 hours. How much heat energy is 6 88h:viuannaproduced?

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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 ym;vise)jt39 and 160 A-h. How much energy does the battery store?)e vs3itj; ym9

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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 p0c(a+ xghsai)6a 0pbkv bx9oxsz0/)c bn )v) 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 light bulb is on 10 hours per day. Assuming thei: jqwh1)j5x+x;i ccg power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annjj5+ hx) 1ccqx:w; giiual 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 (compu;hk o. brko*(jp*x,kf ter plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the comp.b , ofkkkopjx;r** h(uter 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) elec k/85 b*c htxg 7,svfyxkzf/5itric 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 bi b7/s z*g/xiy8 ,5ctxf5 vfhkkll 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 anwuzx+ig i( l25c gc*vlfq6(-isjaq-3 d generates heat at the rate of 2.1 kW. The heating el6( uf -lis+zqv w(a3qc*c ggl2i-5xijement 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/qsdnj74 jjs7 ll pc+z*2vn, af*dw(d 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 costssp,p req2o /p+ $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% 5p-11 qv 9wx-fdjiiajy( /m yhefficiency. How much current does it draw from a 120-V lineiq-xf -iy9pyda1 5jv jm/1h(w? ($1 \; hp = 746 \; W$)

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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 rmqaohli b en,(0v2 01qgmz7w9g myh, /gs current flows througi hmg,lm10(oqv/ g79 yh,e2gn0b aqwzh this device?

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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 c 3pwoadql6-+5,f6q:buqv rw flowsr-vdqf6wol6qp:cua+w q,3 5b through 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 is thejbb/n6j(9 imxr 3:flblx8 t.b peak voltage across this j.bbbxxt mbr 68 j(f/li93nl: 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 c g+r/66*- efy;ejeb yvtovsv/ urrent it can carry (in oj-r e f6/tevbo6y/e; ysv+ *vgrder to prevent 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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