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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 electrici6l3n / wie,os 1gy)c7b6yiylg.3q o9 gt zq;eity by transforming chemical energy into electrical energy is called31zn;.loy 6sgiw3y,icgy)eg itlqe9qo b7 6/ 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 passeskt5b g1-zh q/8b, srjs through a wire's full cross section at any point per unit of time is bzs85kgrhsjb1 /qt ,-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 taken to be the direction tomz rch 4umh79ib+1z +hat

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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 i 6.bo mxw3 kzsonmgac1qdt q4bw72-7ug7v+ 8ps 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 me)fiazpt/rl:9 asure 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 ek/a(km+8p 3egwimf,3fi : 8+w.wjsd abm ,zeis 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 wooc+ iyu +qih 61lv:8fire 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 bn2f.7t nt)li7(er mk 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 resistivitr.p +ol dxr0;d8 +g (7+uj wmkv1xljway 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 other. How do the gecy44g q (3gjchlc:3resistivities of these two wires comqycjlg(:e 4hc33 gg4cpare?

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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 t)s- qlt.e,7c(fhaga the other. How do the resistances of these t.gqf )aa7ttl , s-ce(hwo 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 t(nqk* yu2 )j zo1mslj) uwr,w0wice the cross-sectional area of the other. How do the res)12mrwoj0 (n*q yz )kuuj ,lwsistances 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 le/v,e4s oxc8 v b+jmj/nngth and twice the cross-sectional area of the o,/n4+ s/ve8ovc jbjm xther. 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 is doubled and the radius i8 62:;rkjxs/ddkt x3 j28zg-ojotudxs doubled. By what factor does the resis /;rkgtk6 x3 j2ddtj8dxo2-xuozj 8 s:tance 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 d wc7fkx2*f-gpoes a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and made of the same matkw7p-cff2gx *erial?

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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 metalsnyw:p-ngn t q,tpm6*m,:a2u x:tj bu7

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coeffoniub 2*h),q6 lhkog :icients 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 equivalent t.o e1t6vov6x fw2du1m.ic1m wo?

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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 tccdk. 6l 98dqro

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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 cewufrxh3d 2605dzr p9:aj 1r0w st2qbircuit is doubled, the power dissipated by da h 2ww6095r 0sb:fj2e31xrqzd rutp 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 pp6 ; lk4e6ykyof constant resistance is doubled, the power dissip6 pe;6ykl4pkyated 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 circuitqz:ad-tc*z2 8hg3)ih .niixl with constant current flowing is doubled, the power dissipatedig-q*c)x3t.h:a 2z8i dzh i nl 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 doubled,uxp 99jjyx() y the power dissipated jx9pjuy( )9x yby 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, t.ksjk j k3k:df9a7 e6lhe voltage output is reduced by 5.0%. By what percentage is thejk:6s . fk3e7kld9ak j 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 isa)g a) aymb z;*k9xuc; 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 3.0 A. One w ge7qci o0-q*y+uv m,jire has twice the diameter of the other. The ratio of the d qj0e7*+y,-i qvomucgrift 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 l fn8kcwu)4goo-b(9z essentially zero at very low temperatub -o(z9ouw)l8kc4gf nres 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 2b, pvplsr4+0g e5t3odwn p jcq8..rg.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 electroplating apparatus inz9x.lk;2utb d) twy v0 2.0 min. What is the average c9; k.t 0d2)zbuxwytvl urrent?

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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 p1z 4a 9xac30;1henqfowdw5a vass by 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,kf uof7 6e73hksub /n $4.0 \times 10^{16} \; electrons$ 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.2 j0-ioy vxbg draws 13.5 A of current, has been left on for 10 min. What .b2v x -goi0jyis the net number of electrons that have 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, it is desired to depodc0;l nt nnf* pj(46sdsit 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 weight of silver is 0f4dn t;ns*6jdc( nlp 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 resistadx)v1w82c gv+djel:s nce ofxj2dg+ ec1:v vw8 ld)s 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 resistor if the c:bs5w 4/id) aexhwatk .hju84urrent 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 connectedtuv,mh:;u ulc l*t-v8rjiko ;dk 8i6) 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 m5b l0lp0u -k2vmkk x2/ck nkxk3xm.- is its resistance?n 2 p.kckk0x32/ -mmuk0lxvk5bx- kml

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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.wgu-v6 ke h fy5.6cyg electrons flow through the wi6wy-k 6v ye hf..gcu5gre 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 6k oeata)m*z90.40 inch? (The resistivity of copper eaz6kto*m 9a) 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 1.0 cm in diameter and 45 m0l3o ihv6zpk7 lk)v0n long, if the resistivity in6)3 0h i0zvvkkl po7ls $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 qzv0z,s42( rq 0p3uuf jqm xn5$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivit5w /z7jbbd4thy $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 mnq86s-xl a1c b ris*v:diu.l 0 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 long 22 gauge (the radius is 0.321 mm) w6-edw11nb i ,a go,2;r aeaclm;l+ganichrome wire if it is conna+e dlgea 112w;mgracl-, ;w6a,nbo iected 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 of rectangular cross-section, 3d:2sp6yt, qk v4ija j.wbg v61.0 cm x 2.0 cm. What is the voltage drop along its lengw 6gy.tjv63d 2 ,bs:4vajkip qth 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 radius of 0.50 mm and a resiq: 0an,emt w2istivity 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 wir5p4/ds tcpsm 7e (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 resista,((5x*dwozs l nsgqcg:ov(xuh ;q( )cnce 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 platinukztu2- 2si f6cg xnh(/6bo n3lm 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 po* tr7f meq6t:rint of indium. The resistance of the platinum wirer 6etq mr:7*tf 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 throuqmqlaq --e6icyqm*(4 :hz(0t i a sk cmf73p+wgh 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 1200ftjld(:4rtagt1v/ en4ol (s n 9,g/xu 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 110 V draws how 3cq pf (-x;pkkna) k+av0h, +qmqqv4pmuch 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 d rl8k7bz n04hoesigned to be used in a 120-V cirr k7hl4 8z0onbcuit?

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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 na pjj(i 75npjz2z5y *120 V. What is the resistance of its heating elementn 5nyajp7zz *pj(ji25?

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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 rateqiu6)kff 838h zm 40tf, hjnk0s9pwfdd 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 ratxw h(xoy cbr7abw e28 s +.5( avbtqo+(t)yu/ded 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,pl-vbako2;;/pd rwz ,9q8o rk 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, what is irs,xm59i a2 *vq. b,c.p1,qzjagtln bts 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 resist0d,ng;jw k.(m v k(srs60 xhaiance?

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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 sp9meez n97o79jtyhkh t3i0) ioldering iron for 8.0 hours, if energy cost k hy9otzeti7pnhi7e39m)0 9j s $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 hours?+;fbo2 1bc 2kq secz+/k0h nyx

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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 conne6+ mv3.bvu0e 5 dfvww53 kldokcted to a 120-V line for 2.0 hours. How much heat energy is produced efv5d0.uv+65mkkodw 3w3vbl?

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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 muc/*m ,y at4osgp8b:umyf ul a l.ob50e1h energy does the battery store?o4m,0teu u1af.y5s/ml: la opyb b* g8

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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 3i m *l vcnofthpt,.z+pv )lg. 8cv1j:a 25-W 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 tqfl)t4)lb5tnsk nlg 1zc 6xxo,)y t.97 gk5bd he power company charges 10 centtllk455 csgf6 yb)1q,zbk9nd)t )o. 7lxxngts 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 easn ki.g+*j4q57eoz i l.a,gulectricity costs 10 cents per kWh, how much does i.. qie ,*4g 7nk 5glsua+ziaojt cost to run the 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) b fgt s,6k+9xf5) )tn6tpxyphelectric bill included the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a serie fy 6 pgb59+p tntx)6tfkhx,)ss 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 240wggymab-3h 5d ut;7py6g*oh8 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 will thth-b75 gmg3awpyd*y u;6hgo8e 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 flowse,j( )gh,6vqk-hyx q q 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 costs9tsav r )o(qlk +dyj rj.d3(i9 $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 muchcjn i4 k)i1-tx curk 14xijt)-nci rent does it 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 plbtm,a n2 g/.znp* x/eower source. What rms current flows through this dea .b/ nx,p*nzl g/2mtevice?

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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 so o,.p kdc pidgr is5r3:3+o*px .onh+jurce. What peak current flows through this device?o s gn*i 3pirr:d.o,p+. jcd+k5xo hp3

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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 the pu4jy/qz5bd.m 5up 2 2peza7jqeak voltage acrou zqqp52u. dp/bm2e4z7j yaj5ss 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 maximum safe cu +psevcd6ke4 f 01hzmd(nz9p8rrent it can carry (in ordkh9m0 +f8s4e(v 1 6pzenzcdpder 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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