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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 energy into electriofqtl28, wsx:kti( p;cal energy is ck :foli ;t8tw(, xpqs2alled 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 sectionypgm 6(bk/s*ol v wfl)l1 +. *:ptoxhp at any (* 6/+lgso1wpl.ypxot bp*:m)fkv hl point 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 : /,7uodk ayujaq1zdx **/gagtaken 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 same asbm230 hu,r:f-wyxdgnf z bg9+

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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 of their8wy(ux qh.:llfx-q 6i

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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 de)8f+ rybe 7ws+1 exttvfined 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 iwi 4cp 2z:0sdss

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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 depends ni)j*96tfbao 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 loweaz+ y srj04a47b; + dui y-7dkb4wkvhxst 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 0wh39yee r2 woko;s6sthe other. How do the resistivities of these two wirerw h923o ;0wesosek 6ys 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 otrk j/b06q h0jdher. How do the resis j0hb0drqk6 /jtances 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 has twice the cross-s;bzj186d tpoc9qg l1h ectional area of the other. How 1obcp;8qzhg96 j1 t dldo 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 twice the cross-sce0 k6amb*3hnectional area of the other. How do the resistances of these two wires compahb6 cake3n*m0 re?

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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 dou p-,vaq7i4gtulqx. b8.o)m.c n6kbeobled. By what factor does the re.8qn4 .ub- 6vqc aogb m7xoi,.etlp)k sistance 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.)y fvq y(-kp0.yx5 kn+q 3mivcp:tr4e 0 cm diameter rod of the same qxv( fqp5y : +vt -34k.)pcynyem 0riklength 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 most common me9i hn,bmqs08r 8t ib.2nku1r dtals

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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 resiymu i8 kka5;2bi0/fqj xu1o3 istivity

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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 s(/ 7buyxw()q23y k az0zhuns 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 equivalenuu8r8sj wu6s:;d;v gs t 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 coyl:7gjtvf *lg,iq 6 4znstant voltage circuit is doubled, the power dissipatedqj 6*f ig:7ylztl4vg, by 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 ck;l-wm1br:i s onstant resistance is doubled, the power dissipated by that circui kl-s r;:wib1mt 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 flowinfk8n5gvt2 t 2 x6jiyl+g is doubled, the power dissipated bynf6 8tv22i+ ytgk xlj5 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 resistan46o lokrq-6 xfziz-/e ce is doubled, the power dissipated by to-el6x6-z 4oi zqr f/khat 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 voltagevt(gz*j0 zo 1k output is reduced by 5.0%. By what percentage is the tz*(0vzkgj1 o 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 is referred t:9pd dfput 9x ,k8p4eztoyz 7-o 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 wire has twice yyr5xd (6v: *naxh(j:sty v:wthe diameter of the other. The ratio of the drift velocity in the smaller diameter wire twvxy5xt*aj6 n(:h:s:yy dv(r o 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 becomeoy-lg/ h/f9lhy qx;/ os essentially zero at very low temperatures xy /lfho9 l-gyo//; qhare 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.imb9,7;pkkd /y jj.ch67 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 el e;rxre+psbv 33q+5yyectroplating apparatus in 2.0 min. What is the averagesxrqpbr;yve+3 5ye+3 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 b4my4 -61boc.u jvafloe 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 a eoc (9y38emjif $4.0 \times 10^{16} \; electrons$ 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 current, has been left on for 10 m onxtx i7x+(nhz; ue8*in. What is the net number of ele;nu7 zo8 x(e*+ixntxhctrons 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 deposit 4+v0j36uwu k w* xx:urc0 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 kx6+:vuwurj*wxc 30u 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 requ3)*t. yhmfvww ired to cause 4.00 A to flow through a resistance of 330 W? v*tw.fhym)3 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 current throu9zp ,vtvdn9 0ngh 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 willuym9iyf:f 0q +aq. 4mc 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 r-at /. 2kkgvsvesistance/vgvk.-akt2s ?

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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 gj 5j ei *qer98dkca-3electrons flow through the-8qj9 e3gjrkeda 5*c i 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 obssz 9y+b.wg9f 1.0 m copper wire of diameter 0.40 inch? (The resistivity of copper yg9s9b .sz+bwis $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 m longh-b;iie;-a ls , if the resist;;ie b hla-s-iivity 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 (r c8 u);6mnwn3y4edsu wesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resisthkj ,gf wm0;c(ivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 its resismd* vkj32 ey;dvmgr,wq2 v0z/) t jg6qtivity?

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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 0.32cf1n6xcem g91e9lf r )1 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistece6fml19rx9g ) 1f cnivity 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, 1.0 cm x8op piptl3/5y5p -apt 2.0 cm. What is the voltage drop along its length w3 pip /y-p8ptt5aolp5 hen 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. 1f+)saubjrt v jakd f+.fsyp,wh368 radius 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 co3hql; qm(9 )bzean p7mj)s dt)ld*7 ngpper 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 ml d5)c:vr+uda resistance 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 resi :b cn0r cbtvuprtvna+;5),ognm43 j d/g j84ustivity 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 resistancl rxni9 *cqyb(9mc1c7e of the pibx(9cmn 7cry *1lc9 qlatinum 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 throu0hn if8ohdjs4,:*+bjs9c k spt 38 faqgh 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 ra:cqv k il k702hq qcw3+ip613(koxeacted 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 on 117j(mx;y am dw*0 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 ax. 0hs/3efbybr5bdg:x oh*x2 1w0v z d 100-W light bulb designed to be used in a 120-V0y/*sb5x2b bhde g fxovrxwz3h d1 .:0 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. Whacba7qx3 t-.r k nu9yr93xc,sushi31o ,rfg8 at is the resistance of its heating elementr i xarcyu99g8xc3u -k3a,bqs71 ,r.3ot hnf s?

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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 rad-ziw l/8y jl.ted 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 at an xq*hdgix i 727v7e6$1/4 \; \Omega$. 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.*v7-2)kev( r90ttbdoxu/nd skqd g c 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 its resil * wgx0uw38/ofw;nznstance?

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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 resistanw ab7lzxon80:ce?

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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 8.0 hours, if energywidsa 29,y 4g( d+z *qanymooi3 a*ao. costs mo,ya( ad4onaag2. qi 9*z3*+wyodi 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 us ua7fezx8 0a:me 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 2.0 hours. How much sw-sf1*s ofu,h qe62 jheat energy is w2s 1ef*h 6uo -fq,jssproduced?

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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 atid iv1 -+r (y59ne.frcz-kjsl qllo07 12 V and 160 A-h. How much energy does the battery store?9l5e71fkl+ nis l0 dir j-(v.cz-oq ry

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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 solderv+ml 9t6 vfavio*tdb 08uf:.+ tgr1shzu*b8 u ing 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 hourstzj5 . 3jl/lsk per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity lt3z.j s5jkl /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 ra:(qrec; t:z cr whr/4 p7)pfturned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the computer annuallyz;(p a7er/:rrh)wrct: f4q pc?

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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 rub a6;z* sq6;u sauzdw4tvm)bii, gt-8nning a central air-conditioning unit for 2.0 hr/day at 5dtub6g4 6;;iwzu,aq8z t)-v b saism* 000 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 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 240 f(r3ytymehae h: 2o1, 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 the repair have on the pr moey :3 thf1,2ay(ehower 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 through :vyoo5) sce-i5hf nd 7u 9w:34ssa.vuies3 zy$8.0 \; \Omega$ 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 cost8ne(ste bwm q2c-+d0qb,8kgq s $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 curke,qom98esgicn 1u+ 7rkq + 1s8eonce7i 9g,muent 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-dc pb5srw.e7402fqtt3vlk /4r xc d j2V ac power source. What rms current flows through th0 qxd.vlb 3sc pk4dje54 /7t22tr wcfris 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 powerldl3od cf 3/ocdi wfn+x :4m69c5u;jf source. What peak current flows through tcwl5oui6n f of+;d:3x3 ljc9cf4m d/dhis 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 the peak v6np:sk(jr +jbqszj j)mej 0z 7,*d8iwoltage acrosk7*izb6jesp +,)wjnr(0 jqsz d:m8jj s 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 in) oxr8/kcht)hyh (dwp/o:pk6xtx:j- ch. The 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 elex(rtxd:kow/jph8cxkp6/ : ) o)y th h-ctrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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