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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: 匿名未登录  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 ebaa;on 8 .d mgdwa4/s,nergy into electrical energy is called aodna b4;a s/wdm8. a,g

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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 section atc8mq:f. b+gwl any point per unit of time is refe.8bq wm +lgc:frred 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 vb-nnwuwbz : k+s,;w0b3 :oktcurrent is taken 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 sac-tglsjha1xhq h; ) 2*me 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 rab-rl6 zyr.jz2- htf)gug5 lw 1ted in "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 wire is defe)x+-kr) /j j3j . uono)zoljained 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 wir8c-/ijtjn : 2qoy0thc e 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 ga ml-ppex99.do 1y+c sad4y4ds 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) h36gmavf 6k.q +rl5.ruhcbbowest 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 hv /vkhke6/kkp s z-8u8as twice the length of the other. How do the res/-khs8p6ukek/ z 8vvk istivities 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 other. How do bmjst2wkod yf* 7 uw14;2+rfj 0g1ayxthe rmx;7wkys*2 yf jwot 0 141rgf+a2bu jdesistances 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-sectional na40 9/ v6nta*ght-)og0reya raz1rgarea of the other. How ag6e y-1aha0vzrt/gr 9t0 anno*4 gr)do 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 cr.s7v b:;uec 3o rbh 3hlt1diyjkg)1)eoss-sectional area of the other. How do the resistances og o.h)1k) st e;17rl uiehb cyvb:jd33f 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 doublp,* 4*e mp(qx*e-y07c xofo-nqfdy zeed and the radius is doubled. By what factor does the resistance change?* -fpo4q( ,eexxo*cfyye-mzp0* n d q7

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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 compap *i65tdy+j t,rqzct2red to a 2.0 cm diameter ro trctd 2t*q6+ pz5yi,jd 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 comsn6yh2 zn4+9 7.ptfpzlf0db cmon 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 2+og5brdoe,i 6txwhm97v f(w6e:utv 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 equivalentu4qh8g yni7l,f : k.kit/jh/ w 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 equivalen7g2dp7cuj1kz u/rl +*o8vwld 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 constanix:bd6 fw/ .c-gz:hbd7ip0m n t voltage circuit is doubled, the power dissipated by that cirx /6b7dpzd:mii.-bng c:hwf 0cuit 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 eskf wq)5sc/m6+7oxe constant resistance is doubled, the power dissipated by that circuitwscfeqe)k 5m76xo +s/ 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 g59ly*, u2 ;ytl3ctj ufffb e+constant current flowing is doubled, the power dissipated by ;j 592lueb*ufy f+cyf,3tlgt 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 constan2a vmq,t6h jq/ yqztm4k/* p*gt resistance is doubled, the power dissipated by that circuit wily /mt4qhzv,ptjma6* qq 2*/kgl

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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%. By5k y k,ykqy 7ymkw--t.cx96s;vh/qkc what percentage is the power on a resistor affected?y6q k;tch, y- qck/-5y7 kw9ksvx.mky

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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 refer (eoz/3lt w)atba ex5dc )w78mred 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 carryf8ee q xi6bs/6xhe-tj/x 6:nh ing a current of 3.0 A. One wire has twice the diabhe6e si6 8xn-x t:fqh6/je/ xmeter of the other. The ratio of the drift 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 essent g8oit8q7rok5 ially zero at very low temperatures are referredq t k8igo8r57o 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 i;q2a3d7l0 wvrs s5yoif 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 through an electroplating apparatus in 2.0 min. , z9ho5twm oe2k9-xhj What is the aver-ojo9h,hkmxt 9 we25z age 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 b ;t:mpg6w0 dzly 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 flow4pdwp6dqo(n8. /l y b r5 bhdav8(4qiwing 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 draws i+ dnv4dvc y/n5ti4zc4 4*nmi13.5 A of current, has been left on for 10 min. What is the net number of electrons that have i/+z44 54 nv* dc4cit invdymnpassed 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 silver1ss risj18t1 f r f4ma-;4znuf 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 sf1-snr 1484 a;fmj f 1ustisrzilver 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 cause 4.00 A to flow thrmt7dx di30w. iough a resistance omdid 0ix7tw3. f 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-Wp +nl .j-yup(a5rbja, resistor 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 220 V. l(l i.ldmekwxdw j4t::j*29j 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 is its 3eanblr8scl(:1pp 8 r resistancees: n3(pca1lbr r8p 8l?

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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 electro0e dcz tv69lk,ns flow through thet ck6 90el,dvz 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 copper wire of fgg/ym4 ymcc1j58tp8 j5c+; wkibj vqd71fj/ diameter 0.40 inch? (The resistivity of cijj8j/v4kfqpcm51 ydcj5c+g /w;7f 8 yg1bmtopper 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 cm7)ew 0thmo4mxi)nw7y in diameter and 45 m long, if the resistivity isy wmw)hi7 mx7o0 etn)4 $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 (resistivity4myah/bw4n89y)s a.ulf j r9i $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivi sa8xui d,d+x.ty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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. eca(ju.gzg1 g / kk;;r 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 + amp*z* ggjz9p-*wyx 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is cgz+y*pa - *wgpx m9z*jonnected 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, 1po0i9,yngt9y b 8o h-o.0 cm x 2.0 cm. What is the voltage drop along its length when it car9b -,8ooyp0nyh 9o tgiries 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 resistivity+2 88w8kwv n.axwm,epr 5z ufr 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 copdubpj9vq +*p 2 ftn.vx80 2pcrper 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 resistance ojv tt6w6(bjyo4,biy-:m 7skr f $18 \Omega$ 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 platdc.9sqvdxdvjy:fm. (mc)u;u2: b vq+ 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 deoafkla.u6 4 x5mz,t, 1jqv ,dwtermine the melting point of indium. The resistance of the platin, fa6tmvkudz aq,5w.lo,j x 41um 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 a sae)epqsw -x827n.cm n $10.0 \; \Omega$ 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 at0 wm(8n/kvrpap z,3 - uszl/in 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 110 V draws how much c3 d- f:enpex4durrent?

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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 buwq3 j 7r6n,xnoji 0aw9lb designed to be used in a 120-V circ0qijr n w a67,9oxjn3wuit?

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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 isaon 7j5sed mbr37 ,7vd the resistance of its heating elemen 7m ad neoj3d,bs7r5v7t?

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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 ratecke)r89un(zjq*g g/+ 6c v jcmd 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 ao*g+,1yam *:civuw wrt $1/4 \; \Omega$. 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 bu:2rc: +ka jvvdksbp4k47;h 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. Ifwyxu,)sqru62 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. What is its resistan 4dbnz 7 aawg1ovn,w,dqj-sa-h(da 74ce?

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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 housu5 k7 c3dqlv,rs, if energy costs u v,lk5qc3sd7 $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(ww 30;uj6p1djmj wx d?

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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 connectwyv/cj fai-+0s:ra e8 ed to a 120-V line for 2.0 hours. How much heat energy c -jveysaf0a/:w8r i+is 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 160gqa1+ )zspvb:nm.zy5go: v*o A-h. How much energy does the battery store?nzy:gpvsog +qz.vb 5 oa1m ):*

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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 hour3phlpax6euy+nob/y++) *s r xu/dm 7 rs?

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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 th,guuxkkftf e+w,, . -ke power company charges 10 cents for each ki kf etfukwu,,,g k+.x-lowatt-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 plusy1i)qb kf2v (09 nqbmz monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost 0yb)k 2vfm iznbqq1( 9to 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 cost of runw.7j1tvjf ()*e d()jt lhj hakning 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/dfhw) d.j ht(ak7)vt jlj1*( jeay. 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 elec-5ti-t1os7)qoe p tal6z lw1p v7a/6kv-p yse tric 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 Nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depe- p6sl- w5 vp)-as 77vlotziqaok/ t1y1t e6pend 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 throughk yp *5z;**yoe4osit k $8.0 \; \Omega$ 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 costsm xdf3lr/t.l7 $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% effis 9ndi7.bn3naciency. How much current37is nbnn9 a.d 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 ry i*r+9r ypcu4ms current flows through t4c+pry iy 9ru*his 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 120zasjj +svp-i/i)4 uc x8/+ kmg-V ac power source. What peak current flows throgv/ 8p)+/uxsk -s a4cz+imi jjugh 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 120-V ac power source. What is the peak vt3p q dmk/ql733 u0gfef-ql:ioltage across this device?/l3u p:ft 3e-qm0qfqk d73 gli

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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 maxim4p; ift5y0cpps6;e qaum 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 electrons? (The number of electron carriers in 65 psf eic t;qpp;0a4yone cubic centimeter of copper is $8.5 \times 10^{22}$.)

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