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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 af -h17kxul)hbms3 )z chemical energy into electrical energy h1 a3m-xls)u hfk)7zbis 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 chargevk /p+002kop stgo:uhpf+d1 o that passes through a wire's full cross section at any 2k pt0fv/uks h poo1d:o0g+p+ 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 bk (t8dtw 6 n.)(6f8fkt8dl5xksq h fple 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 same ke7/g a oh;p0qrml(.u ve7pd.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-hourocwg;d0os )l ia .6e aj0zm0:vs." 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 w: aeyxruesfyon ,16cmw-47*m 6da+ ig 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 i8qwisf:sm(pic4 mc u q 2x82z.s

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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 wiu5. xd3z 1(o tjfznt:rre 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 the6oas wewu- 6gci7 w4fpnq.zr5(a. n6 q 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 tt)vsp7:2 sqk vwice the length of the other. How do the resistivities of thessk:t)7pvv2q se 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 lengzm1jn5hh w: d/th of the other. How do the resistances of these tw m w/h1:hdzjn5o 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 wv)kqrias2f8.) j v b3has twice the cross-sectional area of the other. How do the resistan2 as jw8f).ib 3vkv)rqces 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 ,az k-o .4i mfxwzb3u;cross-sectional area of the other. How do the resistances of these ; wzmf3a k4ibxzo.,u-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 doubledirq baw7az0 *2*s gzm). By what factor does the resistance cmb0aq)wi z**2 ga7 szrhange?

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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 bnyap-h:0u u;hz y8.wa 1.0 cm diameter rod have compared to a 2.0 cm diameter rod ofnwau ;: y byz8p0.hu-h 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 metals:d *m im,opje0

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficients ofoq12y 7hn e*xxp+g1 uxyte85u 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 equivalent tobfkq8-qdd x9px e,* 42vxe p:o?

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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 equivalen, 8bdzg4jh q6gt 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 co0:ew, lf eghof wam;knnw4;qp; q72f4*lesw3nstant voltage circuit is doubled, the power dissipated by that circuitk,wnf0* pfnl;q4 egf4 wqshel;3ewa ow:72 m; 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 resistan.(v7psv(y t syce is doubled, the power dissipated by that circui yp .((vtsysv7t 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 cu:wl ez2 r9m4murrent flowing is doubled, the power dissipated by tha lre2um49:zmw t 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 resistipvi*:*w/, pc q qup je 1sq8idzu,,fp902bsaance is doubled, the 2*qvp81 f/pu,wpu: ca isb0,9s*qiezij qp d,power dissipated by that 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 byykpiw+2kovos* m9hcp mpj0 *53w.ma. 5.0%. By what percentage is the power on a resistor m*0*ijmm wvk9.a.+chp sky o32wpo p5 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 ref+d,d 6 xr579acxntwom(j:b qberred 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 c1vzld4lr xg) )arrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift14drgx)z vl)l 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 becomes essentially z/x) o1v -gyw8cm7doz iero at very low temperatures are 1)gxc wv7oi/8z - dmyoreferred 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 poinra+:fqc gk8*gt 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 td00fc nq;unmic5 +4l. What is 0i;q+u5lntd cf m40n cthe 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 h*pdcg 7 + yv k/lb;+ jxyu*t4w67rrgus 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 i ,(/zv+i*v9hwm/tr zbv9jxp a f $4.0 \times 10^{16} \; electrons$ 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 13.5h4 a) p;qoo+zctd9w 9w A of current, has been left on for 10 min. What is the net number of electrons that have pas ;o9pwoadc+) h9ztwq4sed 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, . l ,qz.aw2j)dqaoyw +it is desired 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 ions are singly charged, and the atomic weight of silver is 10qja, .+wldazw2y.)o q 8.)

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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 t/;tqstp/j ;+4 trrf qxo cause 4.00 A to flow through a resistance of 3/ r/ + f;qt4x;tqpjtrs30 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 curren- lcb/ yk:0dgot 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 a3o -kagr rxyei*m.5d )cross 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 dr 8sw-gu4uj jz 1qk,s*xaws 1.40 A of current. What is its resistances1u8kjw*, jqg-4xz su?

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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 electrons flow thr (487wc:wr dz zjwd)goough the wire w oc4j) wrg dz7:(dwz8in
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 ofgh4hnm 3p4 k0h 1.0 m copper wire of diameter 0.40 inch? (The resistivity 3kp4m0g4nhhhof 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 76--ifbpxnyu in diameter and 45 m long, if the resistiviyxbup f-7n i6-ty 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 wirq zs 9x;p9tfng: glr (.2-btl p3x+efje (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 wi8o dvc/u y. i5u(lgh)evtu,d )re (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. Wta 7zvc :2cr8yve :)dqhat 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 throuwet d r z0wqh+4m0,ig.gh 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. (The qd, wwh.+0e4mrig t0z 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 rectanb5u8 t57-xodoui xc5ugular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its lenc-ux5xot8 o7bu5d ui5gth 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 rad( yc;yzzwzo) 7ius 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 copddfabg (l;*7yq scnunzd(,8 .per wire (resistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 ofkj s; qvs77/aj $18 \Omega$ 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 resistt1z esyj:r:9 :fr1i veivity 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 deteri*: b)frz4mhomine the melting point of indium. The resistance of the platinum wire is bm o)fiz*rh:4$2.000 \; \Omega$ 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 thrmu.n 8 *vwt( e-zgftr8ough 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 1o. kod7 j++x wq,ud8rb200 W. What 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 yo4a3( 232gxi nppk zfhow 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 dee .lap3gd5l ,isigned to be used in a 120-V cia5lpdiegl,.3 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 resistai(2nsbqy- ss-x4r/*sy cx 5ng nce of its heating elementgi-n4y /-s rs ncsqy(x*25bs x?

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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 ratevd8;vps :j; b6u--k+nso ba ced 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 rateanfwx w0-pgo fcd1 x )xvxzt/ -j6,:o4d 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 bulb. If it is used at 120 V, what current dut v2eh q.*zk5d8ei/e oes 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 bj7+ 0h1ufg4vt+ yx tw )bu5fveulb. 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 runs on 110 V. What isyk.o/wm;2 xwk 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 opy,n0 k/hv5 hvmerate a 25-W soldering iron for 8.0 hours, if energy cyvvnk ,/0 5mhhosts $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 bbzdit oo,)) x(ulb 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 wxl2ipt eewd 2j;x.26(tz/dh-V line for 2.0 hours. How much heat energy is ie;2xp zx. dte6/j w2wdh2l(tproduced?

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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 by.h ave xd:3h:attery store?hvy.:ad hx3 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 soldeyn23k 8u+vtds j+odv8ring 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 m6egzv)is9d zt ol94bj wq/j7:s) 2vg on 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of9zjd 72) lzteg/ijvo 9q:6 s )wsb4mgv 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) i4rx55x yxyfv i9u-qg 0s turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much doex0r-v9 x i5 fg5xqyyu4s 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 centralobz z9, 9;xi7dpo.q jnl3mmi1 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 contribuom99idq3nzx i7pm;l jzb. 1o,te 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 operates on 240 V and generatj4fo8qd iwjx- 92 mjbeb w),-qes 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 will m9 qbjef2b4-ojjqdi -w8wx),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 thrg 0 d7bcjqcggl 38*cy4ough $8.0 \; \Omega$ 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 costsbc,r/ 7 mln3cndvu.1j $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 of 2.0 hp has 60% efk+bpwqp8n4 j uoyifnuj11* 3*ficiency. How much current does it draw from a 12w k b1puf1y3j nu+4qio j**np80-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.fi*v*n0ekvvwe - y.w5vmo * z5 What rms current flows throu*v-i*en 5 *ze vvv.y5wwokfm0 gh 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 120-V ac power source. What7 xggy;jkajvm(i( r89 peak current flows througv(8axj i9kr; g7m yg(jh 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 connece z3fn28,qr+ys q h4inted to a 120-V ac power source. What is the peak voltag4 zn +,h83qqrsie2n yfe across 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.5sjhk,lkc:a )8yd fd/nh-x 2v The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, wha)xjl vf,s5/ khndy:- kch da82t 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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