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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 bq (rt5tqz 797hb;smkenergy into electrical energy is czht (bs9 k;m75q7bq tralled 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 ses 4( vwh2tik013gcz tzction at any point per unit of time is referri43 t1vgzstwzck(h 02 ed 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 directnxe1;39yf f yiwu4co,+ cj9g hion 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 samew k:6b 41wdg0x.p pr0v/it grd 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 "akbm,2 x,gut 3bmp-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 wi.x)5sx)3xksbraw 7o cre 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 vr4*p5dn jr 5g5tl5dj pyg2m+k/wkz/ wire 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 wircgxe8m:(9ezih4 jaon(b( aby ntr(mfk2z 7(6e 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 the lowest resistivi8gj4xv-efk k s3f(bmy.3/nzsty 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 tw/pp01- hijnh bice the length of the other. How do the resistivities of thes/b hjn1p-i p0he 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 .1:affepetkg54(ub atwice the length of the other. How do the resistances ofetaf1. efb5a 4( :upkg 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 has twice the cross-sectional area of ug3wh: 8agjk:the other. How do the resistancw:ujga 3ghk 8: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 t.1,fxzlda 1d yhe length and twice the cross-sectional area of the other. How do thel1yf,.d1adzx 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 rad .s2rbw:)j -vnw vpv1eius is doubled. By what factor does the resistance chang:vw .nvs r2b-jpv) 1ewe?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How much more resista(stsv:ka3t p 7nce does a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and made of the same materiala7ks s( ttp:v3?

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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 mi4 q6n+i* 91hn zjb)wsejs7hg etals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficientbvsu7yg fd*-5 s 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 equivalenl8rg :a,g7h hxt 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 equivalea t99(h :pukfjnt 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 pownhh)*v;agp u7slhc(94a7qwqer dissipated by that circuv4l 9s7 qcaph;7) whun(a* hqgit 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, mck9ariph o167 6uuop k1y82n the power dissipated by that circuit will9mynpur 26i 6u kc87hak oop11

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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 cuvg wkz p/ooh8.-, xvw1rrent flowing is doubled, the power dissipated by that circuvwko1o zv8h/g,xpw -.it 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 resist oejiq)q 0y3z+ses7ir2lzp 25ance is doubled, the power dissipated by that circszls7o ji2 pq05qrez23e+i)y uit 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 2j3k;uo6wn3 n0 jb+lbbuz s0pby 5.0%. By what percentage is the power on a resistor affecte b02 nosj0bnbu6; wjl p33uk+zd?

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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 r da- ;mgp nb0m,,)qghh0n*q uueferred 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 o g6dl/fs1v;lzg m1oyp o8(8uwires each carrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diamepg ;zyloumv11sf/l o( 8g 6d8oter 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 z)tvcie3 m8 pgvm o3*f1ero at very low temperatures are refer* 1 m8g ivtpo3)fmcve3red 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 06uqka8 9gfiz1bb q k71.30 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 electroplatim sbwqj-hu:, 1ng apparatus in 2.0 min. What is tuwh-sq jbm:,1he 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 for the current to bea- yg 85*fqnsyy 14icf 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 flowi.aih1zh7eifls apv/ am5: 7a* ng 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 ,opqslun 3waq)0 a.1fcurrent, has been left on for 10 min. What .3nq wfal)s1,uaqpo0is the net number 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 desiredevacj 3 o,ik./ to deposit 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 silver? (The silver ionsk3ijc,o v/.e a 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 req p dp+* e))gihhloym4)uired to cause 4.00 A to flow through a resistance *d+ yi4lmp) egh)p)ohof 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 i1.nx ge*-a w-pf,sj y5.0-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 connected across 220 V. What cur ;al-8kjwam4yrent 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 operatinge+xpyf455 pam ,sse1 m at 110 V draws 1.40 A of current. What is its resistancep5 feesym5apm1s+ 4x,?

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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 electronsbo - ps72t /lph1oay9s flow through tlo sptp/-hos 1y79 2abhe 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 wire9omc *e cc3m;z of diameter 0.40 inch? (The resistivi mc*m;oc3ez 9cty 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 diame4k 5e2nrm4 okxter and 45 m long, if the resistivit4kme5 r4kx2o ny 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 5pjh i gc2xeaizq f3)).)rh v)m9c5r nwire (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 wiren0oy1; 2ak(y3ohv.uk;m; cn en q:szj (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 resis.tf,xr j82h(4gasrl stivity?

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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 longf8 +gj)yum :ah 22 gauge (the radius is 0.321 mm) nichrome wire if it is connectedm :yajghu+8) f to a 12.0-V battery. (The 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 cmetwucug v(oi +b 9+qfaw 0:x52 x 2.0 cm. What is the voltage 0(ww2u+cg9ivof5: buax te q+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 resistivi pl6x -f0ifdrl.z z+-rty 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 (resc8kd: s )ko7ucistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resist. bbtdwm-(h9tsqa.(+qjzd2.v ,o a ldance 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 dg(8bx. gogzwc lm w(l*4(.im*3cb ijplatinum 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 poja1 3b+4c4p1njm a21ym*tze mjj qs2iint of indium. The resistance of the platinum wira4aj1 cmb+p3z nmjt eq 21yjs* 12imj4e 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 ak:6 f30pds n8wp1qyrb n $10.0 \; \Omega$ 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. Wi2e3z6-tnqh,;fr7h u wr vr7chat 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 on 110 V draws hohugxdi(qqi5-jf) mi3n 10 a;t w 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 rzkgspy,hfj t h*1o+ 6zw)v0b nu3:e0cesistance of a 100-W light bulb designed to be used in a 120- +ugbsz3p1hwo ,tjk0yh )z v6:n*ce0fV circuit?

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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. Whadmdi1qe) )l.nt is the resistance of its heating elemenlm1 ne.q did))t?

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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 rateur-kcs xs ,4c5d 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 ;j ,c h568yqa0ndwhp3do)mb dat $1/4 \; \Omega$. 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 currev9jo b 8i9z d.ns.y5phnt 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 bulbr-qp u4uj 7 3h0xtd6no. If it 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 r2*8rk i ,;xsc srg3jyuuns 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 cosda g*:bamn0-cy/zv c4t to operate a 25-W soldering iron for 8.0 hours, if energy vcg a- dn4zy:a*bmc/0 costs $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 bcv pa +y4bp6jl r ,zl7ie/h9c7ulb 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 heat enn;afs8:g5,3u7lkdftzr *mb qergy if5 sfbg7lu8 *3dtq:,azk; rmns 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. x.*; -blgab,71kxj dz 8ey ydl How much energy does the battery store? .ya1zd 8lxd,g ;xyl-b*kbj7e

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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 solderingbx aqlcyol:bo,- ;i )2 )msdf9 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 power compan ydafdoqd5) 58b+zu8 fy charges 10 cents for each kilowatt-hb ay d+d5zuf 5qd8)8ofour 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 plus7qmy*x *ocjcq px t71 k- ts))uw5e/dt monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost t)m*1d )5tc 7jtkxytop c/su* w7qeq x-o 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 run70 )ga, 7zcyg-pspzv l rq,6ndning a central air-conditioning unit for 2.0 hr/day at 5000 W, and prq)gpa 7 gd7 -0,6z lnczysv,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 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 electrck1 ro *win 1(k3y +b8lkkte2 m9kwtu v*i1oa,ic drier operates on 240 V and generates heat at the rate of 2.1 kW. The heating element shorts out and 19okom3*ktkn (aw, wbi +e8 rcylt1k1uiv2k* , 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 flow-2he-lu9 ttg es 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 costspzn2p7t3qc. ;n2 c2j6 zmmap a $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 r xb9p0b: ;ct)acppfp4 ate of 2.0 hp has 60% efficiency. How much current does it drawc:tp ;0 94cbxppabp )f 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 source. What rms curren.,vcso dtk.x zi rr 7jyh8d8-6t flows through r xd.ris6.vzt8h-8dc7j o,yk this 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 12b7amkhgvm - ,;0-V ac power source. What peak current flows through this devv-, 7mg; abmhkice?

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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. Whal2z.+6hipqoclkz9, r u4e15gc qe *vqt is the peak voltage across this devic65. g4qe1rukhv i*e+o2cp 9qc, lq zzle?

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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 wix-s v6 ej6j6v j0sjvw/re is 0.081 inch. The maximum safe current it can carry (in order to prevent fire danger in building construc wjs0sjxe6/v- 6vj6 vjtion) 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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