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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://autoconfig.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://autoconfig.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 chemical energy into electrin 0lokgb; yz64z4 ys-vcal ene;-z 4b nzgo40y6l kyvsrgy 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 sec, rbj:ehz6k 8((2pj lpv o,nsztion at any point per e6,8 zsb,2v:o(phjrj klzp(nunit 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 conventio2 70kupq0nz wo* j,pwz1va m)jn current 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 sameuy:69 xyl ewb3q hpj5, 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 s.e-ha 6xrw0r-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 62p dgwgz:qsmix9j.(*r -eiiwire 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 wirlz:v w3rr . ll van,dk1n*h+f-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 depends on23kuvlwj-a 09t/fk) w lp pt sac5*m3n

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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 resm -i;0e0xs/ isdrb) bv,rt2leistivity 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 length8k8fv o2x 0ech01buc e of the other. How do the resistivities of these two wires compare c0khefc8ev b2 u0x18o?

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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. O1wlj5 ,g ,s5jo-avnzv5*u;thd +wjck ne has twice the length of the other. How do the resistances o; -g5* ljh+juwosdvj, ,ck5w1a vnt5zf 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 h8y dhzbdw5:e 4q.te8kkrq;, ias twice the cross-sectional area of the other. How do the resista qzked ;8b8i45e t.kdhr:,qwynces 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 twi+k )ut mb mfl/b4,s7moce the cross-sectional area of the other. Hl)+ b,tmms m4f/o buk7ow 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 doubled and the radius is doubled. rfn f5l71ohfh9nsk6g ,xmd 2wam4* (v By what factor does the 921hmrs vx5wh4am*nfg do,n(lf76f kresistance 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 e9air t+kw 2l,diameter rod have compared to a 2.0 cm diameter rod of ta2ker lwt +i9,he 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 cfm /v.(lrej u,z0c,pg24e9e1idhcjaommon 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 resistivitztv 14qnk:uz7y

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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 equivalexdjmjtq:u5-/ f 9ko(l nt 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 equi10ej.6 dtyobmvalent 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 vol-kahtq*1tsl3lqh vhp ; 3f9gh c2.8mktage circuit is doubled, the power dissipated by tfch;2m9qhllg*8qk h1t3 th avp s3.k-hat 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 powyxn 8c9b cw/s6piro,*er dissipayi8r9 so, nc6cb* /xwpted 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 flo:7v0ccg - tiwhwing is doubled, the power dissipated by thattc cgiv-: h7w0 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 constant rec94 gp5r viu,tm7y my5sistance is doubled, the power dissipated by tp5 v7u iyg,rm 45mtcy9hat 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 pe9i c0m a/-)b-baixa dprcentage is the power on a resistor affbc/im9 0a-iaax)p- bdected?

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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 refed0got jdtaw: mnpt(*(lhk3e( ze- :0erred 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 cubz.l o*-l -xbb,y).8 u+ncl *axegm d.drs8qurrent of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diam .8*xeq* laxncb zdgls l-b+-bur,.d8 m.uo y)eter 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 xmgkd2ab p8-9 low temperatures8 -k2x9dpbgma are 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 9 . fyw d(/ ghvwq*zc11icd)iypoint 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 8ldx -, 4tgnpoan electroplating apparatus in 2.0 min. What is the avngdl 4o-p8,xterage 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 be9 8zka pnvbe.- 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 ifkl5-t,t m 0eia $4.0 \times 10^{16} \; electrons$ 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 bewe ea/z l q.c,1er1h8ken left on for 10 min. What is the net nuehrlzk.1/e 8,1aw ecqmber of electrons that 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 deposit 40 mg of silveitf,d 7kq3(e5v 9bzlx r 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 siq3t,if7 bz9d( lvek5xlver? (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 differencqkh7(:rq o;y/m kfe)ie is required to cause 4.00 A to flow through a resistance of 330 W:m yf;7o)eqkr k/qih(?

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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 resiw4voo;av*d gsha4r/ r(t97j ujhu20d stor 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. What current 2 9) ;hcwdbmxrl ,puj+tb7,: f *tdgqcwill 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.t/uvkk: k,2e g40 A of current. What is its resistance?t:e k/uk, vgk2

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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 elecvwy g72re*etd le/7o /trons flow through the wi7eotdr7ge vy /e*w /2lre 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 or-3baeg ( liu: rgo0mi; +l4ajf 1.0 m copper wire of diameter 0.40 inch? (The resistivity of e iori jg4l+lgar-3(bm:au0; 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 resistanc abb pph3;e7q3e of a circular rod 1.0 cm in diameter and 45 m long, if thqep3pa37b;b h e 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 (resistiv46bg c m4fo50s /g tv.bo1tyomjhwa (7ity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resio2c6 lm ;v,iljstivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 lo hro34oi9 tjr:ng, measures 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 10.0-m long 22 ga5-gy.e,jglpgn 4bm*u uge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resistivity 4*bu-,pngl jme5. gygof 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 +c :0-0tfrmtm* +v6 hznorp wilong and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its lepm+h:wtm60rt rzcvnf0- o+ *ingth 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 0.5upxh.ot5uj6lvy 6up:p156pg 0 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 (resist)m(d aii5mz g4ivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 :1w 3qcek*zv5 x)trnna 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 of resistg(r - jh+uwua7f76crxd +uz1 mivity 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 indium. The resistan7r p .ec.7j/r7*amxzjn g/ebn ce of the platinum gmezr7/jbx..rn/7e jn7a p c*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 an d*;vbz4 v yuzqv)utt8kpg( s)8-rxj9 $10.0 \; \Omega$ 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 dra3og *bug6an ,ew?

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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 *+qo2j e- wjpn g1z5nrs8mtu * z.gw4ihow 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 re j.mh hjehh1-,sistance of a 100-W light bulb designed to be used in a 120-V c,e1-h hjj hh.mircuit?

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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 resistan z6rn3lywgfrc2 pay6kf 8m1+5ce of its heating element3fr18 p+lgw6n yk5zy f 6rca2m?

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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 rat z65lu,3ma oieed 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 jl 1zzc4p4*n03 lb w(xi0 .oerrno7xvat $1/4 \; \Omega$. 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 does it drab02cecu.3x x6nm)t.s9lvr p fw?

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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, wh49 slm67kss cvat 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 bva 5d-z3c7 qnits 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 soldering iron for 8.0 j+ye) yga8n989 rtb*m hwh8cphours, if energy costs8han yhymb*gtwj9r+ce9p 8 8) $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 ligp*pf-oagfpuixmski8 9z,2 ( 2 ht 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 j.pnb1.u w4 id y4:ppgheat energy is p j1pi.4dwp 4pg: ybnu.roduced?

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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. How much energy doe27 e)pej d/bs ,erqtk-s the battery store?-)bqksj/e 27pr edt,e

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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 solk v66+b tne ivm:-;f:klgs0endering 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 light bulb is on 10 hours per day. Assuming the pi0mc7 rtio1da,pb3 r- ower company charges 10 c1-7t3bi0raop rd c ,mients 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 (comput ;9j lzucc8wljyi-a2dc,ea )8er plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents pcaccdlw 28jl,)y- 9a ;uez8 jier 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 dayshlm (*pn b6l4z) electric bill included 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. mh4l*nl(6zbp 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 xe -j 7 fq8vg5er7ajnebh4+s: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 tfr8gxj- 4+7e 5 hvsa eb:eqnj7emperature 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 thtw/v t-g 7w2;j.t aevbi.t2np4 h zu0brough $8.0 \; \Omega$ 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 costsqa b1: : ;vkmueohzh)0 $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 g4h9/xb :xusb 4h 7.tqllme(e of 2.0 hp has 60% efficiency. How much curren4:xt mqb .s ub ge4x97heh/l(lt 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 sour-g-j0/ujr jv o0gb zw.dk-7 otce. What rms current flows through this devicw/u ztoj-.vk dgo j00bj7--gre?

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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 peak curren)klz( .k 1hdvht flows through this( lvhk 1dzkh). 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 l7+q sk,g3lc eac power source. What is the peak voltage acc qlls gk+,37eross 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. The maximum safe curren.v3iga1/ 88fdmm qfdit it can carry (in order to prevent fire danger83fvdiid 1/m8a.q gm f 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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