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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 energykarl q9:sx24lun.) cuq z 3/le into electrical energy is called aqn43ar/ks 9 cx ue.z:2luqll)

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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 at0med -h3a05 t i7trnmf any point per unit of time is 37 5n0tmaerdht -fim0 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 thd fal 9*yw*.;q iir-tg(a.kb ce 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 therq h s cbk7ww:j 1t)99.oyjo5g 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-hou 0s8e11w;xvtg js)ibors." 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 defilwfmb- dv6)9 lned 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 wire38hmys . im) (i .vcc+nx/tyti 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 deplxg/oqg /y -7yends 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 th lf2,t ocd1j ,h-twfal fnei77s5.o4 ue 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 the 1zq3f jmp070tk xkwx e0+, fhtresistivities ofm3h,z kf1tjk+ef07 x twp00x q 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 xad qp x6b7r.7the resistances of these two wires comparbpx77qd6 x. are?

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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.mc)-ufj 3jw7,3j1vhixh y2 wr One has twice the cross-sectional area of the other. How do the resistance7 u1whwf3y3),j 2m jhxcrvi-js 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 zt0mfsz1:6ytli fl8g, ) h8wg length and twice the cross-sectional area of the other. How do the res zlff0 :y mg8gwstth1 ,6zl)i8istances 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 radius is doubled. By what factor do;9m1qoc/cw.lbz jku. es the resistance chan9zk wq ju .c;mlo1/bc.ge?

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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 2.0 cuy;hzxv+y+1 *sm ds v:m diameter rod *mu+vs sh;yxv+:dy z 1of 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 common metalibu5pcjw)8q v3 sb+s2s

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficients o+bhkl l*kj6)i m5qe3 uf 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 equivalentvy)mo8yg * tz1 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 n;r6m :flldf-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 w/ c* hb7rs-attga.4f circuit is doubled, the power dissipated by that /a4a src*.gft h7-twbcircuit 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 ciza0r o:(sq(s xrcuit of constant resistance is doubled, the power dissipated by x z q:0a(sos(rthat 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 powoev-0o:l c,lurt1*z bj *gfq2er dissipated by that c 0*b: t, f-ou2 jegqcl1r*lovzircuit 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 resistanzc 866yvouq* zce is doubled, the power dissipated by thvz *z8uyq 6co6at 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 output is reduced by 5.0%. By what *m+2y; /gfyoghvii c( percentage is the power on a resis+y* h(m;ifg y ic2ov/gtor 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 refq b v;7-ywgjr:hv(3oxerred 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 qzdp 13yjdx9r yfh--*(pedz(carrying a current of 3.0 A. One wire has twice the diameter of the other. -j3h*z yd d-p(rdfqx 1z(eyp 9The 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 resistiq :)djoxr b/8rvity becomes essentially zero at very low temperatures arr/rd bj:x8)qoe 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 0.67 C of charge pasj9c2:r *l1rdfgzios, 2*e (gpvu5a1l)gs e bos 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. Wh8 2(gmdh0jl7rrv z/ ikat is thelz 2 /h07 (dgv8rrikjm average 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 fjn z2yfr09 gvoq4 m /o1slh: 4 v,evk1*lgkxn3or 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 if bz.uj6p0f (xuam +7qz $4.0 \times 10^{16} \; electrons$ 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, h,z uv :z(uc6egf5 +nlsas been left on for 10 min. What is the net number of electrons that have passed5, u:u+svzl6fze g( cn 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 ux y- fuf x lrb31fe+ak*.ikw;7 es*n+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 deponx k+7ea;uxurfilbs**y e-wf+k1f .3sit 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 4sq7 pzkvw jfhn*e79cz8g2)6i .00 A to flow through a resistan2) jfwvq 7gnep 6hzi*897cszkce 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 across a 5.0-W resistor if the current through it is 5.0 evg e*nx fr)ggg57( 7p/qe xh6A?

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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 connec,oi*0obkyvi3 ;ats (+)c z odwted 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 110 V drawb qxrmt vsfti /:1 .6bhjsloq/ew47 /2s 1.40 A of current. What is its resistance?sqm .lv s7b /qi:1hwrt/jo2b/6ftx e 4

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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)y-*epa,)y h: fqysh*md id9x -W resistor. How many electrons flow through h,s * x-)pa9ed h:yyf)imdqy*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 yn28c zrr9mtarv/b -x)yqp/*/ d e1ne0.40 inch? (The resistivit yx8 //rm cza/evd1 -preynn9 rt2*bq)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 diame:qu7 kn3/gr kpter and 45 m long, if the resnk 7r/uq k:g3pistivity 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 (rex5o sb0+cln*oj4:nk bx4da 3karo 4s;sistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 qw0gm)ruf .h- (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 ress9 a lg8g40rmtistivity?

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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 0.321 mm) nuxkxo;dz ia 9 977qr oy9xkrr:g5.k, cichrome wire if it is connected to a 12.0-V battery. (Tri 9ozcg9 ,9kxxa7 75 y;q:r .orkkudxhe 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 d+jj nkmr*vy (9o;7oi4s.yfxx 2.0 cm. What is the voltagj+j y mi;rfs (d47*kovo yx9.ne 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 l -nzhrk(d;2h 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 (resistivityn5r9 lo *lrs9y $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistance3k3xf7 ne(zn5 c*9jpk3xvuv l 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 resistivity dwi vt u*,ep.:). gmzvof 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 deterc+ ee)cq(l t4h38sg1:dprm sgapt g +-mine the melting point of indium. The resistance of the platinum wicqae(e:tp 1dsgr)+c m+l8h - 4gt3gpsre 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 throug8 4bo az)nvl,mh 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 cu 4tzuiuw5pwv;9 c 2yww;e6q.it: u2wkrrent 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 u;xzsxm : / yw5m+6izjcurrent?

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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 dmcf,t7nj2rf 7 ;2q phsj 2v;qcs1s-nj esigned to be used in a 120-V circu ;cjs-nf jp 21,2tsfrsh mn7vq2c ;jq7it?

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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 34kj50skug9frbf ivi xz:34d W at 120 V. What is the resistance of its heating element?grxv3b4f ik:uf3 0zdsk59j i4

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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 rate az:71;;rssyma*acqcd 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 atzeq g (/a111ldhm us2m $1/4 \; \Omega$. 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 cs9mp tqw i;llh:i)i. i-94ww durrent 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 resistany2a.)s eez9yi a8bv 0km3ode3ce?

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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 p+o5a3o(iuunki .8on 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 opl6.3k6nm-cv dzc zv c,erate a 25-W soldering iron for 8.0 hours, if energy costz.c6kzdv nc63 l- ,vmcs $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 9st/ kvbw6;7fo2ph dp 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 connecte a: 9pd,xyjeks;i7i/ kd to a 120-V line for 2.0 hours. How much heat energy9p yek;sdi/ 7kijx ,a: 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 160 A-h.xmuu0./jyx6ce j q rl6/5g ;mo How much energy does the battery store?;/.g6emcujo56jym lur x/0qx

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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 i7r4roj ,3vz 7s(uoo vrn 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. Askz) 1 h9kqfx04gafv u1suming the power company chargesakv 1f )01qxufgh9k4z 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 (compute1utx 1 efjyf5ail 188zr plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the computer alzf8fx15au t j1 8y1einnually?

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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-9cqe) 7y r8y mfr+tce(n2 gqexln .5w9conditioning 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 electrifc9rn 2cqy+g lqy. eex)(e9wmn 5t78rc 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 operater1r6ir4 g x/2baz:tgo8i db)d s on 240 V and generates heat at the rate of 2.1 kW. The heating element shoidz:gd1ar/ 8xotb2r 6r)gi b 4rts 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 thr k;3 :s h+8ee*--arfua rceaksough $8.0 \; \Omega$ 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 costhtk oz23+ s-fu0w9evd 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 t 96awb;hjhw b8he rate of 2.0 hp has 60% efficiency. How much current does it draw from a 120-V line?;b a8h9 wwbj6h ($1 \; hp = 746 \; W$)

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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 i xkox0v xn 84,o8a,yypower source. What rms current flows through this de oi n, y8x,8a4yvxkox0vice?

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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. Whatihz wb km12q(z2p+ )iqfr/q7y/whpi / peak current flows through this devicepi//2hbfwqwy1 qkrp ihq zz/mi 7)(2 +?

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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 conne2 ufhpn k1f.e9cted to a 120-V ac power source. What is the peak voltage across this dev. pffne129uhkice?

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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 ihx u// +msk*lcq sq51js 0.081 inch. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At thimx1l//jsuc qkq+hs 5*s 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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