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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 transforceqx89piyej) ;an :f2ming chemical energy into electrical xaje28e n)fqpc:9;iyenergy is called 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 section attl/mv /g rj*d:tj;-lc any point per unit of time is referred to a-/rtvg*j:/jl mldct ;s

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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 t q rpgav4sv3,7f560r gkgz 0kohat

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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 oktgj)o+ae;- s6ic uy* az4+bis 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-hour k:r hnjr+/wc3s." 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 defined - flwn/lq:cz)abul.3figv3 r85v 0 0gu 9kskhas

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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 wirhv+iod w j0b.7e 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 depends on*,h3oloneqo 9

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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 resistivit xubpv0(;n(tubwb4 pi02odoiw:8;j t y 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 othe4*-o.xw yg n 3mjgyj+( vbbko* zi(;o6z/ iaidr. How do the resistivities of these t;k6yjzy*bxi-az (ng 3 mg /voo+dwjoi( ib*. 4wo 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 lengtd :jmj(2wxvk y:a0c. sl*o*uth of the other. How do the resistances of these two clv(::0wusma*x y2*kjt j.odwires 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 cros-e j fw2g2f 4hd(wtv:bs-sectional area of the other. How do the resistanc fjwv4:2bg-f2 hdwte (es 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 6jhvy;bi)(hdye df t(x jy80-the length and twice the cross-sectional area 0h-)hdx;y6f( yv8b( yijed jt 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 d5.2/ xdi-)ume ncx(y ru uc;fgoubled and the radius is doubled. By what factor does the resistance cha u fc(cmx-2yndgix r/)5uu.;enge?

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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 alacm5 dqnk)fd ff,7/8 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and made of the samdnkfmqlffc5 /d7 )a ,8e 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 metnbq g y70gtbn1 e2nx);als

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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 resis pq:5 ;0 sk*oen 3wrp4t2mgyjstivity

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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 equivalenof0x4z ej usl8z15on4 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 equivalent t3.9d t esonhr,o

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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 constamcanbsrz 81/pow9 wy6t hh8*f/uc +o 9nt voltage circuit is doubled, the power dissipated by that circuih bzw/6hwt9*oosy+ /n1 pm8afcur9c 8t 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 co,+z*qd1 xxwj9wmp-r wnstant resistance is doubled, the power diss -wdw rxjw9+p1zx*m, qipated 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 circuit with constant current flowing is doubled, the t+h3bf.vhy888k 23v6k jd x-as c-dj o4tmdhxpower dissipatedhvk24jbdt .3j m36oa xxd-fh-c 8y8thvk d s+8 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 cpbk+ shn )h165rrh 5ithrough a circuit of constant resistance is doubled, the power dissipated by that c 1bcp+h k5 rrs)nhi65hircuit 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 voltage output is reduce i. yyr+a-6yxqd by 5.0%. By what percentage is the power on a resixyyq6y.a+i-r stor 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 respectu; 7y) 2mb k1zjayk-dk+sq1a n 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 carrying a current of 3.0 A. One wxh :mb-0 w;govk-+rdg ire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to that ig;v:r -dm0ob xkgh w-+n 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 resir5d u6o- -cgt*5 .mzd (lkwvhdstivity becomes essentially zero at very low temperatures are referred t-vouk5z wc*md hr 6 (d.-5gdtlo 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 C of charge pass a ponip(rw c94cs,int 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 electroplav 9fytd uu.8 d)cc 4ooeww90 nd4v9bz6ting apparatus in 2.0 min. What is the average currentud.)986f wcv uw n94dzc40bov9eoytd ?

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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 be 0.50*aq48erk 9 fh:1js s,lmmp vk* 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 flowingflb j 6u3;)an r8ruoh, 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 13.5 A of current, has been left on fn4cz2r1 f6wu5s:hr4b xs j9-fed -svuor 10 min. What is the net number of electrons v 9-b ujhzxr54snfde s42w6-f1 csr :uthat 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 d( txo+h+q.dnteposit 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+tdx +on (th.q 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 cause 4.00em w hvtq+cv-2o5utam-o , 5skqh143a A to flow through a resistanca+kowuhvv-t,a3hq154m m qst25 c-oee of 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 w/ lnub75 /lg.mkyrzqv* z +h3across a 5.0-W 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 conne;+z qsrq1 qb:k gsi(:j3tg)k8k:ow u rcted 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 1101) rzrk70v4.k t4hbcczc4xre V draws 1.40 A of current. What is its resistance?rr4 c0tvxkzrz14c.k)7bc e 4 h

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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 emk qt56 agjfxtl39t-b ;o(v;xlectrons flow througb-ttao 5 v;6gjxxt 9mq( ;f3lkh the 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 diameter 0; dawqqb7g)i7 .40 inch? (The resistivity of copper isbd77)ag iw ;qq $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resistanc 0/exyy1v7p nle of a circular rod 1.0 cm in diameter and 45 m long, if the7yn1 lxy/ pv0e resistivity 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 (resistivit-mjo9cdfa h.t rj4q7h v7,kl6y $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 5zk:+so1 ulxb(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 m long, measureslr5ddc4xn9;l nef)s;, qns (4s cw7no 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 s(.2i . za)hwija/qic tcu4,i 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (Theacji.cw(.2 iiusz,/ iha q4) t 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, 1.0 cm x ;((h3c 6scfqnf:x qin 2.0 cm. What is the vo6fn;3(qq h:n(sccfi x ltage 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 radius of 0.50 mm andaqg ;n.v k:i+azs( +mw 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 (resisti)rz488 b7rlzltdc/ ydg87prh vity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 ao0 7uuqal3s zw8g7q 8f q(se7of $18 \Omega$ 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 pn( l cn3i39teflatinum 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 poi4t :-n f+(naamtzv zp2nt of indium. The resistance of thet+nv anm(f z2-4zt:ap platinum 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 glg*b xe:xwq/ ),td-b 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 1200 W. What curwzuz r:f,i / r:je,y7irent 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 current?m 6g*)qn9;xulj *o y o8mkj5wt

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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 resist+-paqjmu()r,jjeer f 63 t e8cance of a 100-W light bulb designed to be used in a 120-V ci e, mc+efru(a ejj-j)rt83p q6rcuit?

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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 i62, c: t ylqvtyopl;eyl-4m0ats heating elementt ey:t ;42y-cl6q,vl0al pymo?

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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 at :rlc0isd* nykz3c * .u$1/4 \; \Omega$. 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 .,csaa7f*lf5d yxs: x $1/4 \; \Omega$. 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 curreza;stt7iln 7 +nt 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 use68hu/mt hfr,h d 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 iroufyddcq,7i1oq9 d9. vn runs on 110 V. What is its 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 oper4xfm ,pwc8 zp6 0pnukpv1d-7) ks3t lnate a 25-W soldering iron for 8.0 hours, if energy conpu s,kpvpkd-c 1x0 p7mn4flw6 )8tz3sts $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 1000nmiio c-t ggua;f,14-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 2.0q;3-z gm1gwh de j5g 4yee3vh4i-ngt3 hours. How much heat energi13eeg5-jge 4vg3- gwdn3m z4h;qyt h y 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 a*+4z *j za1ptsy0bghwou6 vd3 t 12 V and 160 A-h. How much energy does the battery store?**zyhtw04vu6 sgda1z +pj bo3

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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 inverh ogw13 cusr7d t 3 6(vvqt6aq)4g) 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. Assuming2 5nnutmi3f0 + gzs9nlqxv4) y5 xo1dw the power company charges 10 cents for each kunxq 4df0+)5l9n ygm o52t13nxwvzs iilowatt-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 8b0 qr+w3 ocku47nsk48r 3 ya;oqv yet8.0 hours per day. If ele8y7bqvkwuyqr 0 k;s a3tnc4e oo8+r34ctricity costs 10 cents 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) electric bill included the cost of runnin yu ./,8h+gd(u e6j4rw3bplr 1kyppbpg a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series ry+j .duew(4pb8h 6,blpkyp1grup 3/ 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 V and genera8 grk2vlc u7j*tes 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 pl kc8u*r72vjgower 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)aus:6w( xq yj2oq qxmy94l8 m $8.0 \; \Omega$ 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 costs5f/fpxh9sju9 )slrx+ wh py23 $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 cl 8p3d 0rj0 -.e3of1zwemz7td gca3jfurrent does it draw from a 120-V lineg dero007-zcaf3jw lj3p z 1.d8emf3t? ($1 \; hp = 746 \; W$)

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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 connectedhrwn8rqycw3 *0 fyz ,+ to a 120-V ac power source. What rms current flows through this w y83ry z,rwc0n fq*+hdevice?

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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. 8 7enkp.0( ngsouxue /: uyoq6 What peak current flows through this devicn e(pk.xsgu76q/0y e o8u n:oue?

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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 connectedb(zpwg:w9 tmc h.62 ev to a 120-V ac power source. What is the peak voltage acr(zhv2 e pc9:wtgm6b w.oss 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 co4z 2zh agyrf 1mnjlkl9d45( w(pper wire is 0.081 inch. The maximum safe current it can carry 2akn 194h l z4gm(5ylzrd(jfw(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 one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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