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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://mail.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://mail.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 electric6oq,1e.jfjvk ity by transforming chemical energy into electrical energy is call e,qv.kfoj6j1 ed 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 wir26e5i ygdkxl.e's full cross section at any point per unit of time is refedk2 g.6lxyie5 rred 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 to be the directv 0i:+.gz+w7 atsgn vm-twf h1ion 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 sam n1fn/vp ml 8+ugd+8iwe 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-h ncoo;evhnx 2 ,vkh)5*p5 f+ )faxyh5wours." 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 wire is defi6s 1 r,yn8bdntgy e-2jned 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 id)x6,nhps mk5pni* /jmr 06bi s

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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 wi; :./ wcpqz4baupjb1 vr zy24hre 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 j a m bcxgu;/ewcowym/y:b0v5s)r 1r1 ::oi,kresistivity 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 p)j ;:pd(mz63 wqi1jj;w h dfelength of the other. How do the resistiv6dhfmpjp( 1 ;zjj:3 id; )ewwqities 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:8) hf:m,wahyu jyav6h/4 cxt has twice the length of the other. How do the resistances o:hyh6tv f4ma)axw /, jc:yhu 8f 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 crossncka0*9zvne:w c( fy*-sectional area of the other. How do the resistance k(*c 9enz :f*a0ynwvcs 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. Onu*4k ,c on5nm um:)i,pfv1ukne has twice the length and twice the cross-sectional area of the other. How do the resis vm) nif 1,npcm*54,uuo:kuk ntances 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 dqv7m w;pdd 7 vyq43:gk):y pomoubled. By what factor does the resistaqw;o7d7:3:m ygdy 4qkvmvpp) nce 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 to a 2.0 z lppjra*z2e+- eh 3:fcm diameter rod of the same length and mrl3:e z2*pfpja-e +zhade 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 nz4m z6uq)cvsv8:t3cz rh9y( xu1taa9 ygn. 4 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 a)-qw. 9dnjd :us e;ptof 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 equivalenq 2e 2. 4.u mp5pz1l*b z8jodgrzuz/zct 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 equivn*00-q0 abkq 3ghl*cyosusc 2alent 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 doubled, the powere 1uw9 n (*:vc;b80euwmnhv wg dissipated by t ;neb(9 8vgu:*ww 1cvmwehun0hat 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 res/ln j;i j(o*d s7yv-jdxlj-)gistance is doubled, the power dissipay- o()j l- ng/;x*ddj7j lsjvited by that circuit 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 constant1q+t* vyv*cclk1oq6 t current flowing is doubled, the power dissipated by that circuitqo1+*c*6yv 1t tlvk qc 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 con)whx;z a+cc:p;* +xv s x9wwaj0k 0mlystant resistance is doubled, the power dissipated by that circuit wil+h mc 9jx;w:z+k csxwp0;wva*axy)0 ll

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  During a power demanq0spy51/2vs. uzov*nodehl z2vw k (-d, the voltage output is reduced by 5.0%. By what percentage is the power on a resistor affect-o2zns(oskpv.e wzl y215d0 hv /uqv *ed?

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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 t47c xbw4l vr5to 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 eyb 5j1)qv ddzt+6jkd.j) r.ofbe64 nbach carrying a current of 3.0 A. One wire has twice the diameter of the other. The rat1..e+4rz jjbk yv ddo6fn5tj)d 6qbb)io 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 resistivity becomes essentially zero atq1ffu5lf2-s t very low temperatures are referred ff-tl5ufq2 1sto 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 pllyp1rl9h 82 yy9(vlchoy113 hd9 f tcharge 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 electroplating appa,bngm3dnii )kla1p9 84jektxr0k3 8cratus in 2.0 min. What is the average lia 9dg 4c33kmjinxerb ntpk10 k 88),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 in 10 s for the s0*:mk bg u99pjxxl.h 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 flowing ifg 4j(v; bzihtl*7k y)gagq4/ ryff h/4 $4.0 \times 10^{16} \; electrons$ 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 *p0w (t7 .5bghx mmjmddraws 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have 0.m x7mjg(th5dmp*wb 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,ipsd;q. -.;e b 9aeh /z:rxdq .opq)vw it is desired 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 deposit this much silver? (The silver ions are singly charged, and the atomic i; .deoshapv:;9qrq d eq./x )wp. b-zweight 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 res9awz 96.e tvstistance of 3wt.ev6za s9t 930 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 curres 26m*ok7e 90+sxowwpbb1 tlcnt 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. What current wwa.qb3 tasp9 /ill 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.y1rt-lr/m/t0o* n mes What is its resistance?n* tsmot r/ lm-0e/1yr

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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 7 sfdz yxx*zu /g1g)l:electrons flow through the wirzyl*z :7fdxxsg /gu)1e 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 :mh t 9)w0ldf1bpfjh*of diameter 0.40 inch? (The resistivity of copphdp*j1 :)tw 9hflbf0m er 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 j:8ffzo o8u2zt(, haj a circular rod 1.0 cm in diameter and 45 m long, if th8zho fz:2ajoj ftu,(8 e 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 copper6:c cd4vd2uogdfp 7 4o wire (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 (resisti/pobpc9wav,+. d3 .yd m /tshpvity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 p3 b4 xt4bps68 r2zukbm long, 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 l7ers*0 cdh s)long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity of nis*le0s)d7rhc chrome 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, 1.0 cm x 2.0 cmux8x:coi)).tv8 u t fk. What is the voltage drop along its length when it carries 4000 A? (The resistivity of copper iso )8x. vix)cfu8k: utt $1.68 \times 10^{-8} \Omega \cdot m$)

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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 res7dlfydjq zsr28wm3um89)s6e istivity 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 wicj;fj4rhp i gf4g)q 2wfw(h-( re (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 h fp 58tukwa 8x --nivcu31ty1$18 \Omega$ 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 vg+bxnm*ou+ht(/zi k2 u3fa21yqi3uof resistivity 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 resista8r:o5j 3 0ett9ig4pwas v jg1pnce jt0iwpat g eoj 5gp1 vr9s:834of 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 through an xogguirwj*069pgz ; 9wofz 9 .$10.0 \; \Omega$ 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 willi+ui ib219 vtqzd,y6e 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 h n; y1;kfl a kah7td :j.c6axihm,/m+bow 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 used in a 98k puc0 alg-ky3oj d1fum9 -a120-V cirudkc ak p ao 99fm0gl8-3uj-y1cuit?

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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 a vhjy0n:i5 fu2t 120 V. What is the resistance of its heating elementj2 uhfinv :0y5?

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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 at05z.) pm ;rbg8f gpfgv $1/4 \; \Omega$. 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 rated3-,g*p rjg dgn 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 et3. p6 cimqe2current 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. dixgy q)doga4d,b 219 .g(dkeIf 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 V. What is i4qqy3fp d5 )owpi1 u/uv8a:ij ts 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 cost9;ni9qjf gnv 1 to operate a 25-W soldering iron for 8.0 hours, if energy costsj91 9gnv i;nqf $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 7n hoq6qx3u1y5 domqn p;q5j5 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 fonlx p;(jjn2*( etsq u-1uv)gab)k2qm r 2.0 hours. How much heat energy is pr(1q-vb*uajmns(2 nk;) eljxu2 p) tgqoduced?

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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 :kpkmh44 aff .fl6kb 7store?a44klfph7kf:6f k m b.

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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 8.0 houio*0w8s/fip6xt2s hy v /cqb-rs?

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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 thb xb2zu6,8wm oy-g8ide power company charges 10 cents ubzb8 od2y6mwxg8i,- for each kilowatt-hour of electricity used, 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) is turned on 8.0 hours per day. If 7 nhz999ybhtd 9cnc w57cvg7(l t bd5oelectricity costs 10 cents per kWh, how much does it cost to run the com hbvgbz75ton ( 5l7 99dy7wct9chcdn9puter 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 central a.05lz/2eh gi mtgj*qsir-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light bulbsz .iqe/*2sj0l ht g5gm 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 a 2p(i*kfozlg6 n electric drier operates on 240 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 temperap6ikzo (l2gf *ture 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 throug14os.uf kz,syp +ug q0 ers5/rh $8.0 \; \Omega$ 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 costsikfl w 5-qrw/+-/ofyq $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% efficie woqmt fa /s,5r:2sj5mncy. How much current does it draw from a 120-V lo5a5tw/2ms :qfm j, srine? ($1 \; hp = 746 \; W$)

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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 axbd4l1+5ulu+2 jfr +ic) zvqhc power source. What rms current flows through tdhr+1 cqjlv f452 z+iu+ )lbxuhis 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 flox-apbz 8uaf4ui7)r b; o mt+b+ws through this device;8oim-u)4 bbr +7txa +bafuzp?

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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 connec.gurb t gic*,kh6dl/9(h/ty s ted to a 120-V ac power source. What is the peak voltage across d l9 i*u,r/k.sy bg/ht(c6t ghthis 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. Thehcc) -q 3oecqc+gd r-,0q5nm d maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift velocity of the electrons? (The number ofqq 3e doch,-q)drg0+cnc 5 -mc electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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