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习题练习:Physics Unit18: Electric Currents

 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 chemicg9*im/v cdce( al energy into electrical energy is cad 9/ccg(ve *imlled 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 wr: zoy+j)h i0section at any point per unit o+ j)0roy zhwi:f 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 tt 7hv:0ugj5,uyi 4xkcaken 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 rerk(fx s n;u32 +1oylthe 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 measure + bhrnc6g 8j+cof 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 defined aswulil)4 eh:6cdqoc* /

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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 iy+bhj g j jx*o4lym;/0s

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistivity of ae:penu35 n(o x wire 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 )-l.ma4gw a(b a/3afai na8mp 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 other. How do thee,n0-if pl :9ij,iv*i8y qwae resistivities of these two wires compar9ef,pv8ji iw,:*nial -qe0y ie?

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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 other. How doyazqdh8 /wt. l-tdqz, k1pm *; the resistances of these two wirwk d8q- lpz,h.dz;t1 */at ymqes 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-sew n ecz3hi*),a,iv7ajctional area of the other. How do the resistances of these two wires cznj, aevci3*,7w h a)iompare?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wc( ma1 vnbea; 0y,.fmcires. One has twice the length and twice the cross-sectional area e;b1 0cfv( a,c m.namyof 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 iielt vpo .xvk61 7q -5wcmx:bc1)yjno7,wq : us doubled and the radius is doubled. By what factor does the resistancvw yxevu o:lxi.,)c67bn1w :k7 jo5cqm pq-t1e 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 1.0gav g0a*mda5 0exa32ed+lgy ) cm diameter rod have compared to a 2.0 cm dialdy+5ve)agae2* 3ma0x0gdg ameter rod of the 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 most commoozxu u 3ljs,10n 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 resistiviqt;e s 7xap*i)ty

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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 equivalen -cgsd9r; 9kppt 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 equivahko c -e np-ew(cq(uv/-ot4d, lent 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 power dissipated6wd/w swn60rl36a fnl0p;cr jh. jfboex,8d* bynx6s/,*lo 0a3w ;pc6wnjbhrdr je.fwfd0 8l6 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 doubled, the power dif 0owspqd x-gd c j r0a/ka:.(1yq1oe:ssipated by t-j0:x a w/ oed c 0.1dfo1rqsqykap(g:hat 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 circuiil/ g+spr3v,.58b xq8ja1wekhqk v ip 5xz9 a3t with constant current flowing is doubled, the power disj. ,waixva3 ehg3sv5x pkl8rq1q b+/ p8kiz95sipated 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 aitawg-)hzb g1, 3pq8t circuit of constant resistance is doubled, the power dissipated by that circuit wilh1 tggw8)3bt,apz q- il

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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 m w1 m,cc .8x.uuv4cnj+h(nyv percentage is the power on a m,xmun 4nucwjyv8v+c( .hc1. 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 sinusoiczt* 1n3axd t /:sqvu1dal with respect to 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 c7 / a,p3dowsz m35k/doni moh2arrying a 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 do253s m/ ohi/zo n ,3pamdk7wthe 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 at very a sskm5n2td t ,w ajy*7hj84+alow temperatures are refer 2+t,8*wa 7jsnymjtasdk h 4a5red 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( *k:h1ki5hb; uqf0-aaq c6hq(o qw we if 0.67 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 throu1gm qzcu) acz64jvl53gh an electroplating apparatus in 2.0 min. What is the ajma6v ) ugcqz53zl1c4verage 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 yum nn3aqeh )++tuh-4bs/zjn r041goa 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 i : - tm/fm*f9(kiz/idqjhsum (f $4.0 \times 10^{16} \; electrons$ 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 1n;v3*.c/v-h j tfsxqo 0 min. What is the -vh/fsv j.*;t qxo3n cnet 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 deposit 40 mg of silver on a met.*,poq+gwuod+l1dpgw1qrd , al pp gdl++gqww.q1*do du,1ro,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 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 cacm+ j(3zvc w6yuse 4.00 A to flow through a resistance of 330 c(m3vzwc j+ y6W?

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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 r20(8tibg8bhny 1uv y 1l f;magesistor if 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 kfoww/ xd+sb;,ac+ n4 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. Wtw/m f7p;/ zslv/: dufhat is its resistance?/f7m fvt//; d:su pwlz

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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 t1 to glleda)vh9)jo ,8hrough the wi,)d9l gvjl)a 1e8h otore 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 ofe 8 nxmxzv r+)/;zp8ca diameter 0.40 inch? (The resistivity of copper irpe) v8axczn8/ xm;z+s $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 lon x(dhedzndev 4 *f15u;g, if the resistivit*5 f 4dv dnz;ux1dhee(y 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 (res-,cmtbocjbk(3g9m i(ai h/0 y istivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (lil 5w6*7 ,bi,s,vvidgfhz )n resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 ml7h 36w*rc.mg+cs kep 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 iswd65,x wge)0(wcpoq4pee6 vk 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The res6 w6epe0x gqd 5wp,(oev4wc)kistivity 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 n7s6c c6ll )7r 2oavt:,ytc zzcm long and of rectangular cross-section, 1.0 cm x 2.0 cm. What t:cal,o7zs 26vr)l7 6 tzcnycis the voltage drop along its length 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 r4p: tmh7o(ce oadius 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 copper wire (r).b8 we/yngu5zzd,d3 d1kiii0req5nesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resg+c,p v 42 .. +legkjwmctt4xzistance 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 coeff* f )sulttwhnf o-29/7xqeii9icient of 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 i n2+v czm6mxmlo /m(fwn1w,c /ndium. The resistance of the nwm+m21, nox6v(mwc// fm zlcplatinum 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 throug 0s2o.wun;w hh czll yx/b. 6uk4.qtw(h 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 4wxkt6elmg4bfc3 f04da -v o0 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 o rwcd1s8me:fs w5;p9 qn 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 resistance of a 100-W light bulb designed t3 hz+*kla)y ews0ckb 6ql0fl9m mbo44o be used in a 120-V cirl a9emq c+)kk44 w0bf0 bl6 smol3hz*ycuit?

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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 waxy67z f.y6omew62 melementyy66wx62 we 7ofz mam.?

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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 amokg g32u +si1t $1/4 \; \Omega$. 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 ratmano+xyy k*+ (ed 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 current does it dr(f 8 qfn/ugnc(aw?

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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 ) g amrqtyphzhs6cm9w(cq30( u z0,/tat 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 itsp8o wz4doqr99 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 to operate a 25-W soldering ir 2fbzl vc:xe2 mu+sx)2on for 8.0 hours, if energy costs )vbx xcul22+ sfm ze:2$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 hou-s4n9 f45 ryg cur-b ks,yxz)nrs?

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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 c:+p, jgdhvbf9s- 7jpo 36bpt heat energy is+3fg,s: jv 6jcpdo ht9 -ppb7b 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 th act68toe.;td wc )x-re battery store?c ;8 -.oeadc t)r6twxt

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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 3 t ophzkd* xx/gv4g4-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. /zmeqk-nkh:)dr+ cwh7 4sem : Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the azkd hwe) k nec mqmhs4-7/+::rnnual 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 sna;) rl/ni*s8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost tosnsla n;)i /*r 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) electric bill included the*g p v gby/ sp,shqi;i(o89/px(;gdgf 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 billgyx g; fp,od;q(p9svb/ i 8*gpsh(i/ g 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 elez08 l ap se85if3jj0pgctric 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 Nichr5lfs0ai 8jzg8 03jp epome 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 zy;4gnf3 a(qbthrough $8.0 \; \Omega$ 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 costse3k 4-c9wys:y o*v tde $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 theew rm5+.)drtd rate of 2.0 hp has 60% efficiency. How much current does it dr w+ddt5em) r.raw 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. Wha3ntf. ;+ pe)g(eb qoxsn45yoz7q7 +bp bfpfw7t rms current flows through this device? ; . 547t7b(ofpq sp)b+x+pb o3egewfyqzfn7n

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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 pq 3*7auts 5u)gqil9y1 abu6 zm q4oz.lower source. What peak current flows through thiz)giq56l q ts.9m3ubaua z l1q4 *7oyus 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. i;5 -gmm gnl;a What is the peak voltage across this devl;ga-; m5ing mice?

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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 dve ,2sndo9j ra+ y7u70.081 inch. 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 electro yudad7j9ern7,+s2vo ns? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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