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习题练习：Physics Unit18: Electric Currents
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 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 l y3gh/ 4yp3,rta 8hxoenergy into electrical ent4hx3yh ,aoy/ 3lrp g8ergy 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 sem 3c )q3z6otgffk7 cu.ction at any pc oq7 .3f6)zu fkt3mcgoint 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 convention current is takd -w y1lup8myy/, ox6b/pp85dc xya b6en 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 saab:zdu (l.r d2me 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 measure 4q 5d,ym2+gr mn8gisr 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 defi )9 *yd y:a)xtu f7mscybhi+3f6f8h exned 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 wire8 pl9d 5lwrva6 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 depen x6e)vl 3ldn/vds 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 ho33h*t 4y saqi f -vjfjjx3n6.as 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. One has twice the length of the .y2lqmszb qp67;h5tlother. How do the resistivitietq6zl.y;l5qshp bm2 7s 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 of the oare5e-r xgof.biu8*rn d1); pther. How do the resir 8r r-)a f1pxe.eg no;5i*dbustances 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 ;xceqw7omob+ s 21 jk/has twice the cross-sectional area of the other. How do the resistances of these two wires ebo/72kcqo swj;1 mx +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-nism0;6exy2 qcd 7j i54.h romsectional area of the other. How do the resistances of these two wires compare?5h rjqcy7.x;me0 i642 odnsmi

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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 r/3 c0kna5f,e eg7gee gadius is doubled. By what factor does ta5 e/g,30 ekcngef7eghe resistance 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 resistanceojsrpn4 6z77b- lo h7t8d:bdh 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 materialr7d dl7zhs4 78oohbtp njb:6- ?

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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 metals7cn 7jne:oebwy- , )jt

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coeffqnl,4- uj g)nticients 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 equivalentu)h zhb zb0w-fo bonry9 ;(5*-exx+jg 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 equi c1,pra :9bzg+papk8gj(c 9b uvalent 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 ci-de3v 1va li-crcuit is doubled, the power dissipated b ve1dacivl3-- y 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 resistance is doubhd tr3ks822vv8 yv6v jled, the power dissipated h82v2s8jvy 6vv3kr dtby 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 constant current flowing is doubl:;ydd (e*etw ved, the power dissipated by thtd: (*wy ;vdeeat 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 o.iur; nm4bgq2mkio65vf3y+circuit of constant resistance is doubled, the power dissifou64rn3v2 y kom+im qbgi;5.pated 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 demand, the voltagccyi:w7 0r6tae output is reduced by 5.0%. By what percentage ist7w6caryc: i 0 the 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 to2wvp8q m 1lbv ,1kvtcs m u1ibcvi8,4( 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 bnqn5*; 6tqd ioa 99vca current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in the larger dia; 6co n9b9idatq *q5vnmeter 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 zero3bd *w t6d9 a i3ryimbgl6*4jztcw)/ e at very low temperatures btmg3j* t w/64d i*cidlzare 9y b)w36are 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 charg .oni +x,t lhp,-gr z27m/q9w-c q2htqp/ydtwe 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 *ybz w-ago1) 5;oz cznthrough an electroplating apparatus in 2.0 min. What is the average current?oacz51;) yngw zbo*z-

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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 bgefi,eni,3/jl bqe 8/ .csc5b kzz /7dy a point in 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 flowing if to ;*i+vl:r7 tvru4xb $4.0 \times 10^{16} \; electrons$ 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 lelh rd0+ o99 ifue9pg3r8fkkz 3myx5dh6;:kdraws 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have pash9xydhkdrpi6m9f3kl u;0 +:le 58 o9g zrf ke3sed 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 desired to deposit 40 mg of si*0t; fv3ukjp :3co baxlver 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 cu*bp;jf k33ca:ovxt0 harged, 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 cq/mosx8vzag014(g kb t( i j8hause 4.00 A to flow through a resistance of 331g m8 (04ojxvh8i tak/s qbgz(0 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 gw . edpukib1w0; u q1ztzo)6a(bq5u*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. What current will flow?r3zlxb 33h 6fyf7ny mr3: uh:n

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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 currentz bj70oh(t9 r/mst7a p. What is its resistance?0z9/rtpa m bot(sh 7j7

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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 electrons flow throuj:we04su o 6ojgooj jw:6ue 4s0h 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 1.0 m coppv+ /wlwtq f.n,er wire of diameter 0.40 inch? (The resistivity of cfww,/.l vn+q topper 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 1.0wkzkfj i3bfi/ c 9)pms y4l8(9 cm in diameter and 45 m long, if the resistivipciw bms 3f948iy/ kjzk(f)l9 ty 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 wire (resi -9tb cljg:a+)kgk kg;m aky53stivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (sp+ 8 x4sf2bcf u1a.+ack4 elcresistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 itjn)) c8c-nu1*y whuouzx2)y cq3 f*e rs 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 (t) +vavsa2 y.c ati5z.rhe radius is 0.321 mm) nichrome wic t vzr2 v5a+)..aaisyre if it is connected to a 12.0-V 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 osgl96 ancm;j ;v,okg: 3cco;0 1 mkmdhf rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length3l; nd1; so6ovcmh;: ,cacj gg0 kmm9k 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 r (:bz jdbkbs;tf9227ourx m,dadius 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 co1 jze8 c rbq):wxw9b6upper wire (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 resiste(3;g pe6 tvtiance 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 of pl6bim4y (ozlakv2v j04 atinum 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 resistac ud9d /nx8tn.nce of the platin8n dncxu9t./dum 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 ainoh8u *: e4hkgk,y .nr7+dwmn $10.0 \; \Omega$ 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+a e .bs+ sx9v.benrv; 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 Vsz21vld- 4gs,;ia kx pql) (lw 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 aq7;qvv(s/,tp lzhe ,awd* o: x 100-W light bulb designed to be used in a 120pa*w svlz;:v7 h,,t q qdeo(x/-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 of its heating el xktc:.74gqwrementgcq7tk.r4w: x?

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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 rateun15je6am .( hx ya+tjd 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 rated ave7onkqw u k8:2 0gfg93qdejjl6ny46vy*j6 et $1/4 \; \Omega$. 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. uwej iit2k j/60 fia(5If 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 bu4 qazry. v,9j7yrcfff3v iv*9 lb. If 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. bkka;t9d srse1 o.8 8gag;fo* 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 towphov s+bh+e),l rw2/ operate a 25-W soldering iron for 8.0 hours, if energy co r2ow+phl+ hve),sw/bsts $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 10tcsn5 ) mcl99d0-W light 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 connec6)z cq(oc nphze7: :qgted to a 120-V line for 2.0 hours. How much heat energy is7qpecg( ::oq hz) z6cn 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 si82sxjg-jeoer7 m rds*v55s( tore? ro2(i85-gse5xr* 7jdssjvem

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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 soldmr48m c u6pw;mering 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 the power com6er 3;qd cx9ytpany charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to oper c9xqty3 dre6;ate 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 kka)n ,d8myiikl* c13 day. If electricity costs 10 cents per kWh, how much does it cost to run thei)kym ldac8n31 ik, *k 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 includehjfj4v5ush3k mx p,nh7is 9)4d 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 bilf5 hk v4hpjs794nsi h3, mjx)ul 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 opr ncbhsrns3)8z8 ;l6uerates on 240 V and generates heat at the rate of 2.1 kW. The heating element shorts out and, in repazcl sb h8u63r8n)sn; riring 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 t;7 m*at4c pecphrough $8.0 \; \Omega$ 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 costto5m8k 3 zckm eiy022as $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. How muhf0bi l(wrd o3tkb9(/ch current does ith(k0b9 fw(it3lo r bd/ 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 sour.9xu1 f9zeevq4 avvk 2 u(k6akce. What rms current flows throughzx49veuk kaa 1 ( fquk6.2v9ev 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 souvso 84 pke/p w9whkx(nkrf8(m48u w)s rce. What peak current flows tr 48)so( smfn(w49k8h p vuwpe/xkk 8whrough 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 -ji510uo ilf 7minc-y (zhd5f120-V ac power source. What is the peak voltage across thiuo hm1c d 5ifjfi5(-n0ly7-zis 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 kn,wvtig0pw+3f3(pl+qwc 3l 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 of electron carriers in one cu3fq+3vlgiw t(w ,c3wlppn + 0kbic centimeter of copper is $8.5 \times 10^{22}$.)

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