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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 energ ro2sb oo-c.)l2gv/i/8z x dbuy into electrical ene2-)xbs2lrd ooczb8 . /vu/o girgy 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 bzw e;h5j i+:fat any point per unit of time is referred jf h +;iw:5zebto 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 conve 2dza x9tym :9qdr5*ckntion 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 a-)kza/x.g; j 9ehmpnj4c w. mwhkj47 is the 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 hw jw(5curo c-.:wp:gmeasure 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 defin2zar /u8ei vnm /ty0jb /s6l/ned 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 isbw k3 y3w0xpix0e:o2/ -t unkx

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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 s: .sq,9qj b wbqf.8b1v o7pkjdepends 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 resistivity v5:y.yzdaljlwuv+,gy/nz. ov1y( xl ; alue?

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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 8l*r mzkblygobb5k *3) ,+v stlength of the other. How do the resistivities of lg8zt v,brys5bb l) k+m*k *o3these 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 h+y dgr;gqojzv1i0dk/qg , -5 the other. How do the resistances of these two wires co0hvdrdqo;1 gj g-ig/ ,y5q+zkmpare?

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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. One0s(c6ws8 binb8wk scsg9 ;(ya has twice the cross-sectional area of the other. How do the rbi8(wscw asy 68( n9s sbg0;kcesistances 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 twice the croslz/cca, ,c p:ss-sectional area of the other. How do cza c,p/sl,c: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. By what factor does bhxtfu.;af2l- gs+z ;the resistanf+uzgl -.; fxba ht;s2ce 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 ay1ifmns. fa35 1.0 cm diameter rod have compared to a 2.0 cm diametei1fa s53n.mfy r rod of 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 metayff ,j)ftckoq b3x-0 /ls

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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 oxk t0z/m 2az)-a j fj,k(jhp:65zy yoresistivity

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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 equivalen7)0e ikhpw 7zmt 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 to n*fn(,tenbt/

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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 voltageb393mcnmiq0: s*pnzq circuit is doubled, the power dissipated by that circuit p3smq z3qnn0 c9i* :mbwill

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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 doublx.l7g1cb.x x wez,tfkio t8)4ed, the power dissipated by that circuit wigwltxc).ik17zb .8x ex4fo t, ll

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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 wk9m m1 kp:havb;jkp0 d.l ;*oaith constant current flowing is doubled, the power dissipatphdmv. *al:; bokkmj19pk a0 ;ed by 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 of constant resis1mv8q gd,y2is bf8d5zvn8rm2 tance is doubled, the power dissipated by that circus28 5qndm f 8y d1vg,mbv8izr2it 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 outputrw,0y:se 54efcx/rl e is reduced by 5.0%. By what percentage is the pw,el exfr 0srec5 /4:yower 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 sinussj, q26r/2ku6pljl kp oidal with 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 haq.nk vg4h swwldvb0 rr(335 vb0.0gcws twice the diameter of the other.hb4dr q5 3vw0ls03(. .bvrwvg0 ncwkg The 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 resistivity become0eclt )+tz q/:ffmds3 s essentially zero at very low temperatures are referred to lq+ t0t3f/fszm:ed ) cas

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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 0g6ep2e +by7lpn vr, 2)stnfo8.30 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 ele i.3 nci;(lcgzctroplating apparatus in 2.0 min. What is the a; gcn.l3iicz(verage 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 invjf xkssrqr u p4ct3/a)/;0. m 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 iw 7r+-eagf7b5+vku maf $4.0 \times 10^{16} \; electrons$ 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 ; r(t5hd.k cxuu(li9adraws 13.5 A of current, has been left on for 10 min. What is the net number of electrons that h5l( d( tih9r;.a kucxuave 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 silver o2hhzl5y jsl /)kinve+5ez. w-n a metal part by using a current of 2.0 A. How long must the current be allowed to run to depos-.5j whkzl+lsh e n)yvi/ z25eit 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 re7ky0 uu1e8rr nq:v 6 ,ryv9zaz61usw zquired to cause 4.00 A to flow through a resistance ou7zuw n1rsrazze ,r8u:y 10v6qv ky96f 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 curren387cw;* xs6 -4/ hzwanmofggcvlg.fut 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 .v* zere s*hh3connected 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 draws 1.40 A of current. What m7e io.dccjn7* a;2mf is its resistance7mfmie a;n 7d o*.cc2j?

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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. s7(xgee2y, )q0yv o se1;mjhg*r jg/fHow many electrons flow through the wi) ogy 0x s*mr(yqg;1g/ e7efsvh,e2jj re 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 1gt fi;o jr:i9:.0 m copper wire of diameter 0.40 inch? (The resistivitio;ji9r:fg t: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 rvk+a 6wvk7*qeod 1.0 cm in diameter and 45 m long, if thea wev+k 6v*7kq 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 (resistivij-w q n)oje;1eqd.u 4tty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 wifi)mp ,f+asu s xc194mre (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.ent8po pk/8v.ewt9m 8 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 gaugj o vit 1vbj4vx(c83g9e (the radius is 0.321 mm) nichrome wire if it is cono8 j4b( j3xvct91igvv nected 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, 30: q7ptxqiac6usu u11.0 cm x 2.0 cm. What is uq:cau7106iqpx u3 tsthe voltage 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 wd 123mnhox6x cire 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 (rxbkc84emdkurt l g:/of (1ych,p; sc4;-.uz uesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistance ofg5 g:xjkk)xdf9sc h)4 $18 \Omega$ 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 ofjkm0nrk1 ce jz-z9c8/)* eacdff 52s f 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 tos eyszl 30g72s determine the melting point of indium. The resistance of the platinum wire i37 ss0g2syzles $2.000 \; \Omega$ 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 througi rc 5m,6lkrec-/v 7sah 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 amz8a fla npt9*:p5/t 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 Vnzajp1 49esf2jfy +1g 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 designed to be used in a 1lbo8qag5 q0./si s0x..sr n bt20-V circsbngx8o0b a qt.sl.r 50iq./suit?

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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. Whh:, / 0vow sth4piy-aw,d1mbxat is the resistance of its heating element? sx1hwbpv, t/,im4woyad 0-h:

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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 at f6laf eg jq . cq8ukx6a4,7;oqb 2h,ug$1/4 \; \Omega$. 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 ati*ek; vqs.f.9;ikj ucw z 9(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 0 t:n kkdmus.,bulb. If it is used at 120 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 resistaxqgl.oxni l6i6j / i*p *bd0,ence?

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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 irogz 6cl3h 78wl/psgte +n runs 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 cost to operate a 25-W soldering iron for 8.0o/n3:uuip1xjx az/ b6 ,lb7tj e5 /cmqxrn:z 0 hours, if energy costsu traxe/oxu,0qxc6 zjj//3zn nb b7:15imp:l $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 us8 :rbnzb/rydvn480g me 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 1l n tdwdpfviv86 ,/x:;20-V line for 2.0 hours. How much heat energy is prwv8:dlvipd /;f ,n xt6oduced?

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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 does the battery storenxa79) ykf(zp? fxap(ky79z) n

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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 ,1c ;eok:nulo )w osfd m)g)uam.bb, 5iron 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. Assukslo /fifvra4qe ,y:jpb: ./vn,c/yzk z22h9ming the power company charges 10 cents for each kilowatt-hourlhs9kn v :jfy.: o2 4 /e2/pc,zbv a/fzqrk,iy 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 hzn (exi.riptimc5 i4. 4ef8g0ours per day. If electricity costs 10 cents pep45x(ietg.4ricim .efn0 iz8 r 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 co kht/nef/1 f0entral 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. Ho thof/e1f0kn/w 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 drier opsa 8+uvp4 f7kw,0hwo ,eqe/b qerates 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 temperature is unchanged. In reality, the resistivity of the wire wi7ve p wqbo/e4+uf0s k,ah,w8q ll 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 through g)f9w kyzop;ctt 8zne+ 8euu;+xb5f+ $8.0 \; \Omega$ 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 *al4 ny/h,;f nq y 8jprl*je)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 rate ofs,*l9 hjc 8ubynrj)+n lz tk97 2.0 hp has 60% efficiency. How much current does it draw from a 120-V line? (u jh7ysn8rl n,9*z tk b9l+)cj$1 \; hp = 746 \; W$)

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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 p*fki*zgdx, gm s1yezd.8o q87ower source. What rms current flows through this devigmg,q17 f*kdi 8. dzez s8x*yoce?

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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 curry:1. q, cltye gxqnf4*ent flows through this :fc *4l1nyyxq .gtqe,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 sourcez3 1ex8ywcrt/ . What is the peak voltage across this dev/ zt 3wyc1e8rxice?

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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 maximumvy9h i.kxzsu.*x 0hk 5 safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, wha.z5.9hk*v0x sykxu hi t 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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