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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 elecnla)z3 robv85+g i0fntricity by transforming chemical energy into electrical energ 5n+)vorbzf3la80gni y 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 chayhr (nw, -(abwz,tny/4 sej(irge that passes through a wire's full cross section at any (4yan (bnr,i,sj- w t /(wyhzepoint 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 taken to be m oz. /6te)g wni3xz-jthe 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 thnnrd/bz +9 m ,vko,+gse 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 ratqnbb430ok i+ fed 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 b,6g;:zekwud:i 7i vj 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 wire is2/l8l crzli9 hli :v-u

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistivity of ah ze2 unhfz*md42)j3slto 5j 7 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 bh(fh7bt,v r 3nc6r e2the 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 ofhlepe,.2 ic xops 7qv , u5j,uf:q;y+f the other. How do the resistivities o+ .5l2jc 7 hp,p oeqfe;fx:u yvs,qi,uf 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 wiresc8a- kjfs .v4m. One has twice the length of the other. How do the resistances of thesfk . c8sjv-a4me 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 area of the o ztc9oas+pekdis*n1/ 7nb mws 5)n ae2/s z8g0ther. How do the resistances of these two wires compare?/t*ps0sag81onk zws) /9 2se cab7ine+dmnz 5

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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-sectiosd,)g)k9wio p(mbc ,sl o sqsq4g-y30 nal area of the other. How do the resistas9ds(-lq c,3,oipgqks0gb) w)omsy 4nces 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 doubled and the raz . :6)euvqglzyr0s k 0xrqafk/ 1v,3udius is doubled. By what factor does the resi rql,zx3ua1ykvkfs)06q0erg :. v/uz stance 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 dr+sivkx 7; wrjz y0/fwv65,b8n: oferiameter rod have compared to a 2.0 cm diameter rod of the same length and made of the sameswb k :vefn+wyr0,67/;zfiv 8or 5 rxj 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 mos +j oe39k+ p5bcpk/dh ,wrv*nvt 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 resedqj2 2kp+17cvdrb dl. qu);uistivity

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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 to04 xrd .uqu4( rfxylu6?

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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 equival6qe vuruc:e,tj*5q( t f;2jeyent 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 dissipat: t9min7vfd+v ed by t9t:m i+v7n fvdhat 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 nmptf j **36pypower dissipated by that ciny m3pft j*p*6rcuit 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 b 8kp.li1hso3; lb;a ja circuit with constant current flowing is doubled, the power dissipated b;k1l.8b ;bl oh3a jpisy 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 ofps fib:,l5t+q constant resistance is doubled, the power dissipabql,f+ti: s5p ted by that 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 voltage outputrc0t /(jtt eea)vb+4r is reduced by 5.0%. By what percentage is the power tee (br0)4j/t +v acrton 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 wit, hp6,btq z-rbh 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 carrying a current of 3.0 A. One wire has tf0y 33evkwdn)wice the diameter of the other. The ratio of the drift velocit)ny3we30f vdky 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 essentially zero at very lpim/efza(b 2-6 7mdmk0 8j mxwow temperatures are referred to afjabie px(k6z 28m md7mw -/0ms

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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 point i i9i/6n ,eou-ql .zohrn 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 electropla6b75 fcuvxf 0oting apparatus in 2.0 min. What is the a bv u0f6xoc7f5verage 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 pa ,r+ codhf*yp,jr8 +wfss by 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 flowing i2 vbmy2 v8jda j mrk(:l(2*ijyf $4.0 \times 10^{16} \; electrons$ 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 bedd; xj /t4y.ym1wc6 ooen left on for 10 min. What is the net number of electrons that have passed through the cd .yx4d16otmc;o/wj y offee 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 up zqg7eer-ow 2j9/-.u t4mlmto deposit 40 mg of silver on a metal part by usin/oju-l9rze e. m2u7qm4tgwp-g 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 cause 4.00 A to flow3 vx2,:o2t2 w(aqbvw )pmks1aqi j;te through a resistance of vvqaqs2,iw2)ek t3 mwxpao:tj 21b;(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-W res hogx;zpc7+ ;fistor 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 acrno q 8g2b)jjn e1(1ydioss 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.c,q4nodl5*hb 40 A of current. What is its resistance?d5,cb 4lq*ohn

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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 10kffb99x 0mjj4 0-W resistor. How many electrons flow through k0jfm 9j94f bxthe 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 resistanc/1u 7sf -n8rxnhp ,nvpe of 1.0 m copper wire of diameter 0.40 inch? (The resistivit7p sh1,frn-v/pnunx8 y of copper 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 cm in diameter and 45 m long, i a32/ u;yrssyof th yurssay/;3 o2e 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 (resis. fv4msvoq. 6jmw ikm1u+/ a0utivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 yrh8) )sytoi/o8a3 iu (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, measures 0.040 ohms. What is its resistivitxhl.9.jo + ude4m .svcy?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the current th c;u7ulqk+wt2 5xn u(ncge*,d rough a 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity of nichrome ut;2lwq5*eckn+x(7 gn ,cuudis $100 \times 10^{-8} \; \Omega \cdot m$.)

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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 xil-ys: v05x2h v 2h2fs3 jzmqcs6z-sn 2.0 cm. What is the voltage drop along its length when it carc h6: vm25z s2vysjfxq2z3 n0ilshs--ries 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 xu.rvw2v b8ril. uh8m66djx 7wire has a 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 copper wire (resistd fe ugaf: vbjvefxn 7x54,1)4t4c n.bivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 haz28zbcj: m+sojw6ko cu r29y;s a 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 u u4j:dcv;ht0o/0ah uof 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 hux )4ggk:k1tindium. The resistance of the plax k:gt1)h4kgu tinum 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)+5lsw pu/wsg(ognr9z x7-c tngz*(o .ej uh9 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 120od+ h cn)eh 8zucqp0utq 6ol 2;xr:21z0 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 ord+rr+gty)0lc7 65apo pn90htom *ppn 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 desijet9x4m; v8-3ct upr agned to be used in a 120-V circuit984caruxtpjm- et ;3v ?

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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 e u2u2yv0b qts/d sah9 8v,,z-xv(dg balemenbd,sa8hz2-u yut ag/sv d v,20 vx9(qbt?

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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 ral1w3 zz,js9+efwvkm bq6ef2( 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 k6f)leve*c9lwk2ah)f l bk4 : rated 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 .uqny7)ipdua an 0v1: 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 120 V, what is its n;.ljm7g5x r xo;8+cde c+ziyresistance?

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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. Wh9r70evbv n6w aat 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 operate a 25-W solderij2u8z ot )i.iey kra1;ng iron for 8.0 hours, if energy co8;yiei 2.1a)ztj ruo ksts $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 doest r2)uco*ryjou/n+ -h a 100-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 2.0 hours. How much culk+f-:vhhxt j5 e .z +p,)pvheat energy is produced?p),htz+ :uelc hkj-+5p.v vxf

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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 xu47r+il c+hlbu )7uju;z i5t A-h. How much energy does the battery store?x+i7jluhl t+uuu cz7 )r 45;ib

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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 hour gz)z1rxj2+oz s?

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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 onnxn t6i4d 4mech-d8,p 10 hours per day. Assuming the power company chargm4ncx8h p6,e itd-4 dnes 10 cents for each kilowatt-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 8.0 hdt2pqk7 d)qe .f9;b hmours per day. If elef7d)9bq.d pk ; 2eqmthctricity 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 running a central air-cx0ezilh00 gc. onditioning 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 cont00iezhlcxg .0 ribute 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 a8b7qb m7gzrz qh9y -h01xjor6 nd generates heat at the rate of 2.1 kW. The heating ezy-j6orz b71 xq 7 r9hbg8h0qmlement 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 flows thro ttku3,:r cb:3lx.w. ;u kkczuugh $8.0 \; \Omega$ 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 costsusdc+fq2q+ m.ocx*l ( $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 athz j4 3.4r(sxdydy-gz the rate of 2.0 hp has 60% efficiency. How much current does it draw from a 120y- 4zxrs3ghdzy 4. dj(-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:3fd1*t1adxh x:gp(h a2g/w pmgwc;w. What rms current flows through haaxw:w 2t/gf1(g dwd p:*p;c13h gmxthis 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 sourc) pgte(ouh *.9vz 0puve. What peak current flows through t( 0.gv)peoh t*z uuvp9his 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 12o cmk2av the+;vd6+2e0-V ac power source. What is the peak voltage acroseta ve+m+;kdhv22c 6os 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. Tuv2:g :m :i;xsc tojmf v60p-che maximum safe current it can carry (in order to prevent fire danjstcu-:x0iv oc:mfm2 gv:p ;6ger 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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