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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 transformid*qb0 b xr3l8cng chemical energy into electrical energy is 3*qxbrbl8dc 0called 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 tha0;3kgxfg:i +is.2 w9 rvy zybft passes through a wire's full cross section at any point per unit of time is referredg z ;v0g. yii+wr:xkfys29b3f 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 bza ;t9 u, k6nu71. e4wgmdhmmge 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 thvkz3x rj+ w-+tv1 d/f2c,yuj je 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 inqe r8p:xjd w21 "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 wirecwn0m 1;faaom10 l/s u 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 wscoq8vw1 vxv+gjh.eoo. + 2v /ire 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 w v6l x82z4wesv l8qhe7ire 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 y,vzz 1ygubee :v 8d26lowest 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 other. How do mrmci6)ciehh 57 43ttolb 23/or (jcpthe resistivities of these two wires co b hj3c) i/r (3ocm74m265iclptroethmpare?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper tlqx.o/)kdg x)p 7f+nwires. One has twice the length of the other. How do the resistancfgndq)l t) x.p/7+ kxoes 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 7l k7ido:9 phdwires. One has twice the cross-sectional area of the other. How do the res97:lph 7ddokiistances 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 twice the cross-se3aswka*ak:-.mpf. zz7t *7ey 8 fhrb nctional areakfntkzp a*7w z3 8-:. asam7e*yrf.h b of the other. 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 do axg4og6d p6pd6rvvr; )1ovks/u(i o /ubled and the radius is doubled. By what factor does the ;i/x poov (6/ddrv 4g)6srv1 g kpuoa6resistance 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 comparedh ,rb4 tgrnc,*fqd1s+ to a 2.0 cm diameter rod of 1cbn4,r *st +,h fqdgrthe same length 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 most7r*h6urhr+t/pul 5a3 fy cf/q 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 resis1kwy:9kfal2 ntivity

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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 equivalenk9 wttpwy009ec )zn:p t 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 equivalef* vfhfp7 7o+jnt 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 czwlvt g3lc, 97u wi 34wp*;h3rwrv6mxonstant voltage circuit is doubled, the power dissipated byw 3utwwxrmv; gvpc7h3 ilw r63*z,l 94 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 8 1koldo1ys e:i+ k7wodoubled, the power dissipated by that circuit wewkoo 1d+ko1l7i y8 :sill

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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 curr x.bc -rkgqm;vw-k o27ent flowing is doubled, the power kmgc-bow.kx7;2qr v- dissipated 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 doubledqjdl,; gw nzs4 w21bd2, the power dissipated by that circuit willn1 ds blj dwz;g,4w22q

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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 output is reduced by 5.0%. By what pewy:tlxjd(m x/4p z:j71 - xwomrcentage is the power on a resistor zjw1tpxmm/::xy o4x j(l7d w-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 to ; dla6)+7p-nvi:ii/g boi jr sas

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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 wire hasd4mxcqgpaf /3e 1g41i twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that in the l m31p1egfg4c x4ad/iq arger 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 essent8/zwq- wzv3nr yvhd 2uh-i-f.ially zero at very low temperatures are referredhdhwv /-nwz83v i f-2u- qryz. 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 Cnhv2 yvq/ 67sqja3o3k 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 apparatuqoa7ynpnr; f6d1; mg,0vhzu l6,; ax ls in 2.0 min. What isnxpf a71 ,;qgmvyd 06lz;n; r6ohl,ua the average 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 current to ,crbuv h5i-.u,v0q q del3jb5 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 dc/5p(guu cufa9 x5,j 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;n6l)f2o rakw6h 303 mivtibl draws 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have passed thr63mw0b;tofl2nha) 3r 6l ik ivough 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 desi gde1d/fk28o yred to deposit 40 mg of silver on a metal part by usf8g ye1d do2/king 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 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 fpbj v8nj k7xzc;/)(lkdv/v (cause 4.00 A to flow through a resistance of 3jv/pl 7 v)vcz8kkfn b(d/j ;x(30 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 curd nr s*dcwe177rent 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 ac2jf +pvx*xn4y ross 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 c-u ,qkt umd)l*urrent. What is its resistance?q- udu)*lkmt,

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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 m-nv6:u en6-fl9 zjpw7tjq3fju g)4eqany electrons flow through 6j3 zu7pen 6l-9jefq4tqg nw)f j-:vuthe 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 ofq3+oo oqlc02v 1.0 m copper wire of diameter 0.40 inch? (The resistivity of cocv0qql o 23o+opper 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 god dfsk og /nr49u usl 8;38bdt/*8brrod 1.0 cm in diameter and 45 m long, if the resistividg8;g ufn rb4/dro sb8 *tl/s8od3uk9 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 (resistivityuoo; e20 8 3znwxjpz/q $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistik96iyc- gbvzpro3*6 svity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 yfdblbsk:avl .vgh* (/; q w73is 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 gk/u+cfpzi1-raz/1a d4 - zofrauge (the radius is 0.321 mm) nichrom r +/f1-4fozaud-za1czip/kre wire 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 anj)h095hxsh y efs qj/,j(q nl0d of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivit )eqhj ,5 s0l0jsyq9hx(/jhfny 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 res6hy : vcvk/ bae74c9ssistivity 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 (resistivi7ie s+f)us ani//6qzity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistanf5*k w/ 5shhs8su/g7( /h lcfvoa-r oace 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 plat y*5xmi bj4 f8o,yyzdp.avo 3/inum 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 (x;p,j 0datiypoint of indium. The resistance of the p ;xajy0p(dt ,ilatinum 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 through6-zu6cmm g -ip 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 raqaccn6 7l(84uz f1enjps( wm8ted at 1200 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 on0px-w3uq) /d bh uutg, 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 resuei7(dfov ,.lk4xh) ;vyds, oistance of a 100-W light bulb designed to be used in a 120-V cir)7, df,4ovi(;yvu xd oks lh.ecuit?

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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 euv8 - jdz1e j/v+py7a khi2*sdlement+p zjde/jka2s8h 7v *- vi1yud?

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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 ratogop)c ssp;qf+gen7-pibennz456 qg 76 fe4*ed 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 raig6d5 o)v dyx/ted 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 bux rw)b,:5:/l9 i; gmgbpxyeyalb. If 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 bulb. If it is used at 12tp fy2z55, 2fly0 km4e0cit aqxw,p p80 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 resistance?,w93ot uh exa fo; zi-2ukq3z-jfi -f0

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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 for 8.0hyl+73mwn7 pxvu4 4 xx hours, if energy xxylh3wp7u4x+v4 m 7ncosts $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 1059* di5k x(+equ mep nn0tb gumpnq/8:0-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 connected to a 120-V line for 2.0hh5xgmy7- 7mu)pi(e04f ex ch hours. How much heat energy is produce pm- ueymi(gxh4h h5x) 07e7cfd?

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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 pe ( p(-uvx9xw vp(ch9does the battery store? ex c(p-vuwhp(v99p x(

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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 hourswe;rrgpr5:rs d0i,:5y iugot 4 o;v n.?

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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 isw)sxpds)z 5zhtu-e q1, *t4t: pz/q ex on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to s* wzzp /:dsx)x t)tp,-t qqz4eh5e1u 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 turn 3*8wxq sish:mwu5i)epc1f )mx v t4t;ed on 8.0 hours per day. If electricity costs 10 cepi*ti4 8)wmws1h e;u53x ftv mq) :xcsnts per kWh, how much does it 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) wn:n.4ce9mg .w)wo bk electric 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 biw.c m o4:. knww)gebn9ll 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 ed;vs67sov ( filectric drier operates on 240 V and generates heat at the rate of 2.1 kW. The heating e;s ivvdf6(7 oslement 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 flowx ken(5yx z0r7s 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 costs pr ,o8um( 08tlc; rixp$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 much curn e-y0d 5be,fr- drht hb;-4( rkbo-crrenter,-drre;br0d tn5o- (hf -chy-b b 4k 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 power source. What rms current flowqqe scm93 4uz.s throzq c4se.9m uq3ugh 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- x bs x+uuc bkqels-(u4k;l;6 peak current flows through this +lxskk6 x(-;ub euq4csb-lu ; 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 powgix.39 (xfyippqjk8v9d4nx + fi)o0(es w:z ser source. What is the peak voltage acrok3 (w49i+pjqx9:x.(g ye0pfoniifdz s )xsv8ss 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 current itqy65*g3b sgvhnm 9b0 t can carry (in order to prevent fire danger in building constructiony qs9 03bhtg6 ngb*vm5) 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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