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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 76，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://51fly.win/test76.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics  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 c kou*t+ 2y6ffuf/fxi+ :/bp s)2jd (oi s/qfujhemical energy into electricaloufu2 k/j6is: bf (xtqff/ * /oiuj2sd)f+y+p energy 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 at by.bsz7-1s r, mv)auy an.ybby),mav -7rz1 ssuy point 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 the diro6ag-d:ik j6lection 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 theo6 /q8hf* itqw 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 of2(4w,iymvqrg;n -sd;o kwjn3 if 9:cl 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 wgyw*si:-c:r1mzyi4p fq;l.ov w6pz,:(fkj u ire 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 4jv.fo8qq u yp+1et1 fis

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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 wi5i:uez.2pwv6z2b kl h re 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 th-mujn3guw;iyst 7 iz 1c 4.wi7e 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 twiaumb 8s*nxnw8v* + c:bce the length of the other. How do the resistiviti8*+*x a scnmu vbb:8wnes 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 the +e4l tlc6rm/twmlh9-f vh5r; resistancelt;6+ w-vc4e f5 rhtm9r/mhlls 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 hl+8l f.yk ro6vas twice the cross-sectional area of the other. How do the resistances of these two wires o8f.r6ll v+ky 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 tptt* 6hehu 2orzb8.llj4:aj5he length and twice the cross-sectional area of the other. How do the resisto *tzbjhr65l:t8. jle4 2auhpances 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 whatcb;l ws h;,0nw factor does wb0 ;;,slncwhthe resistance 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 mitt:tg4m5 wg0p5oq) a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and madqtwmgtg t054o:ip 5) me 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 m,(3wos d5w6kp 1j4rmy,bijzb ao g/ 4post 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 coefficientsqqqj6xz43 0poixp /x4 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 equivale6 7p10wr pijghnt 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 equljsd; yy;wno: nk825-1p5 rm nknrcj/ivalent 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 gqv7 3jyfiawuu2t, c*av0 *lj45i+ xqcircuit is doubled, the power dissipated by that circuit willjcxfi*7quu+i0tq3al jyg25 wvv ,*4 a

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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 cisdu .p vu-v5(le 26ixlrcuit of constant resistance is doubled, the power dissipated b vi.uu(vexd5s 2l p6l-y 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 e2z:a8bz gwxihfh-5) b; s5 secircuit with constant current flowing is doubled, the power dissipated by that cir ez h8w-x5;2sfeaih g)s:z bb5cuit 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 o ejr -7gowrn nx;-;o5yf constant resistance is doubled, the power dissipated by that circui-ygrn onxj - ow7r5e;;t 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 outputagdw,y *a.pd+ is reduced by 5.0%. By what percentage is the powergay*dw ,.apd+ on 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 with/c xdjb s lg(,9k:)kez 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 cu +qhiugon mh88rx+1 .urrent 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 the larger diamet8r8q.+ hnom 1g uh+uxier 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 redad 8 ul-nb2jz98 ,bu 9g,5gt gb:7wcnpki id,sistivity becomes essentially zero at very low temperatures a85z-lpuukd9 jwn t9ggib, , 7b2n,:bcg8 dadire 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 pass a point in 0.3 :o1k gizwj8+c ;vs,ri0 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. Wh +vpgl5xei 7/y:s ;paeat is the avp/vel 7:gsayxie p ;5+erage 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 for the current to be 0.50 uczywl 7t7tcars554. m4bbz f2 j9wc- 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 q(g xqehp;h.r7gw8 1lt7uns 3$4.0 \times 10^{16} \; electrons$ 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 jwg*a.h. z+wyrjk2 ;)kjhp2 gleft on for 10 min. What is the net number of electrons that have passed through the cy; k2rjp wha+2g.w ghj*kz. j)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 to deposit 40 mg of silver onw g3 divhxle 9.+l9jd, a metal part by using a current of 2.0 A. How long must the current be alhdw9li+9.vxe ld ,j g3lowed 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 flow through a resl8 dikc,0 orsv+ l:;vuistance ol; ,v0crvo s:8u l+dikf 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 rdphohm)hg 31:esistor 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 i8q2za u o.v l,8qq 4rd24grtoconnected 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 11o+oo4.(37b c-bt f l3mjvvapr0 V draws 1.40 A of current. What is its resistance?+p mtoo 7.l3fvba3v roj(c4b-

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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 rahpqrdqx. n+:se6 hf0 o66g7 yesistor. How many electrons flow through p6 d06 h 7:.eyfrxs6oq+ahgnq 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 wireku-,cku 4gab.*7 c )edtenx +gfo*f0r of diameter 0.40 inch? (The resistivity c ,ncg*gf u7fd0uerxa)b-t.+e4ok*k 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 b1jfr zd sg5o ;/f269hxoo *utzc51kbwkl)1 d in diameter and 45 m long, if the rescx whgdf5;l r tk u19obf *1s26j)doz1ok5zb/istivity 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 (resistivity 8i5s m)sw(6a-fisjk7i0sf cx$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 wirehu4a4 5y dcc8p (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 resistiv s3uwxner b*buy4c2+)ity?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the curren 9khgpq r/ byjjo,,*4et through 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. (Th,po k,rgje h9q4b/* yje 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 cros.k)4i oirhf+ vpq5 bo)s-section, 1.0 cm x 2.0 cm. What is the voltage+ hqp)4kr)ob .5i oifv 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 and a resi/ 23d ,sykobnjstivity 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 (rep-ie59rbp lz. sistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 res6i6y51 g4r9be0t1on:amfe lwynkf a+istance 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 of platinum3rh2vj b/cr9gy6y+rq 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 y99 hz7n i7hnqthe melting point of indium. The resistance of the platinum wi zhh7 n7yi99nqre 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 4wv6w: i ynbv4,jgz 6d/cufak5l.*vw 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 current will it drac 9izq:p 4he*aw?

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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 ovjoa+r u *;v:pn 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 resivfxug g+e cev; 7p3nz.f-)pe 9stance of a 100-W light bulb designed to be used in a 120-V cin+v.efe z;7 cp pg)u3e-f9xvg rcuit?

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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 hi al.:t8a6 bx4 (q8k:5qagae inon8xaeating elemenaonkqta.n548xa688b qi:ae:agl x( it?

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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 h0+knx v 4+)cwmsece(k7 bm5j 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 at ejydgw)0em/ b5ha;(d $1/4 \; \Omega$. 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 (gk0t v*)y( yu:mztacV, 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 .hq )ob ql5jo )h1g0dqit 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 resig yuh8qeh. t3f:)/a yustance?

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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 houhgp 5q dm1g+5wvz6neyte (7)qrs, if energy cos yh(gtevg e)76n5 1pwq5zdqm+ts $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 hoursgbxftj0c)q:+ p*2 pox 7ob01x ak8 gz(ciqun1?

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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 lu 9+jy4+wcy wjine for 2.0 hours. How much heat energy is y+9 jcu+ j4ywwproduced?

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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.5fo.vrd 5vrw. How much energy does the battery store? ovf5rw. .5rvd

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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 solden(k g9+gd .mdnring iron 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 lighth ( 5m;oe 11fwcr6l/yeynl- mf bulb is on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour ofw( 6/h m5neor;eyfly 1clmf-1 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 hours per day. If7*w ejw8dhhs.(r ycb2 electricity costs 10 cents per kWh, how much does it cost to run the compute(swyd8 cj hheb7rw2 *.r 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 includdxsgf-8 v4.n fed the 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 bill if electricity costs 8.0 centgf- .84xsfdv ns 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 2+c -jr pebj: +3u)th9crqun5q40 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 willq9ej+)t5-:+ 3cbujcnqh rpu r 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 flowy*4zkl : ydrece. /9dks through $8.0 \; \Omega$ 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 costs yku* b55b xx)h$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 y:ddh hht sdt1;z9c.8he 3fpsk .b;g3rate of 2.0 hp has 60% efficiency. How much current does it draw from a 120-Vh9;b;tyf dzs3 8d3g.p e.k1schth:h d 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 rm*a:b ;csutjkndo,) 0ts current flows through this devij tt),docbsauk0* n:; ce?

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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. What pe96azk yl 9vbx)ak current flows throughy9 bxvl) kza69 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. ,suawnz ,he2 m0f 9 kbagh4/n,What is the peak voltage a,,sfz2 ehn 9nu,aaw0 bk/h4mgcross 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 coppe y(,dm t jp er9rp(4ydd.9x(dxr wire is 0.081 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 electrons? (The number of electron carriers in one cubic centimeter ofd99 yey(pd4rm dp(.,dxtx( r j copper is $8.5 \times 10^{22}$.)

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