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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 transforminw /eq-i wr3njgd*aee16,i io.g chemical energy into electrical ei w gni.q1-/d,weoa*rj3e e i6nergy 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 wirel-jd l;uau 3 u:(ukkl,'s full cross section at any point per unit of time is referredu-uld(k,kl;uujl: 3a 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 conventib3/r9ip(e mrhon 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 :3j 5 4 tiuwgv:b(stqpis 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 iaf0*bldj( hs2s 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 wire is defi v0vg,7ontkb)hwz-d v1d60gv 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 wiqr yc4.-s keckfsyw 5cou7515xz:v 3zre 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 o xoprf- tg4/h-n

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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 valu *gdb;sq5q wqj5cr7wv (kf8:hy,mj6ne?

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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 le oll phm q1-e1e59ywu4ngth of the other. How do the resist-yuqp5 1l e4mlew ho19ivities 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. qqsgou7zx 7ne0r: b7n(om: s71n 3mq cHow do the resistances:7mo ns(nz7os1nx mq 7 qu e07:qrg3bc 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 has twice the cross-secti lwp(3jhsa5v: 4io* joonal area of the other. How do the resistances of these two wljh4 vio(sjp53a: w*oires 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 le6wrhd il5k.9wytg) g 7ngth and twice the cross-sectional area of the other. How do the resista.ry kd)56wtih9gg w7l nces 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 zgi2n9lq+s 7m radius is doubled. By what factor does the ren+2qm 7gl s9zisistance 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 diameter rod have compared to a 2.0;ed)a9 j y4l8aol8yw n cm diameter rod of the8y8o 9wyjn dl ea)l4a; 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 mosthb +m 55g6ny ktxr62g8buqre: 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 coefficients of resvdkjrr91pn 9rv cg-q7+ 0uu x9istivity

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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 osg /m92*vph mto?

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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 7hzb*ox g-7fzt 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 aeiu bksk6 1u5h( 6(cvw :ptp4d0bpk x- constant voltage circuit is doubled, the power dissipated by that circuit t6((b b5 -pk 0xh :1wu6sv4pekpukic dwill

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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 o:/ks /d9php8sazkmf: f constant resistance is doubled, the power dissipated by that circuih8 d zfsspmka9k/p/::t 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 curr-r.x5 h::xas7x wbq2wyqchd/3dj g3 bent flowing is doubled, the power dissi bdhx/3- x3rgqw qc jx ab:5d7ysw.:h2pated 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 resyq/n qy o,u8c +(ir3vxxx/q8o istance is doubled, the power dissipateoo3u(qx ync +/q xq8/xir8vy,d 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 red;ea2 bb(f k,epep6z /5 ih8ontuced by 5.0%. By what percentage is the power on a resistore/5;8nehtb6pe pb 2okz(i,af 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 respeciaeprt.qp-pcq4bq-j.ao+. t)5 t s : dt 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 *f h, ipt9,u.b0do o dkf*(dylcarrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaf lio, (u*p h.0 ddd9fyb*ot,kller 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 becomdmziw3b3a y 7th):9k ies essentially zero at very low temperathzkyi3b9 :37dmti )wa ures 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 0.67d3nli;vcy q oa2,*p f: C of charge pass a point 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 appaqivci1/f d/ca(kn(8 h ratus in 2.0 min. What is the average cur(divn8cq1a/hk( f ic/rent?

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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 f-pibsz2h:rw0;9luc ha-g6*fc; tsbsor 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 flowt9 b6/l9gnf w7jj4qwe ing 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 current, has been left on fl) 5f/kr t0w/wini)bjor 10 min. What is the net numbtfil )r/j)w b n5wik0/er 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- u sh2/bgyrpo:khw4vy, kt3lh6 c0m) process, it is desired to deposit 40 mg of silver on a metal parhwy6g,tmshkcoy3) v u0 : /2r-hb4klpt 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 108.)

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What potential differ5prs d(r n,m+pence is required to cause 4.00 A to flow through a resistancer+,psnp ( 5drm of 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.djddqmh4x 5gtd 0o4/ 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 22 ux om.dav7z070 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 drxwi7xcau40yf g-in. :aws 1.40 A of current. What is its resistance4yii-0x x 7w.an:c ufg?

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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. aze gsuv1q+ hg;6)*0:qizu gh How many electrons flow through the wireu ;6h u)eiv0qs+agh* qg 1z:zg 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 wire of diameter )x /-kl(hvzx kc50pvgs /4 gmw0.40 inch? (The resistivity ok/ klsm w4vg5gz-xp0 vx)h/(cf 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 co:5.ozmgy4p gut4lyw4tq)h 7m in diameter and 45 m long, if th)ht.u5 4y4wozl7moqg :4py tg 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 (re,ghb71.wf;q2cf lj6 / ajfa oxsistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistirc s n557dmdl3vity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistivitdgmu kzm q-hgoh8;h (t4+l.k,y?

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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 gauge (the7o cpok pbn;**p0ct9 g7leax; radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V batterb 7ookenxp*9 gc l7;t0a;cpp* y. (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-sec xg;3f;--mht v+o , gvggr1l3wq8nem ftion, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (81x;g,-rt-qflm3o;gvv h+g g en3wfm 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 resistivitms jua; u3)kd,y 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 copp7y0dl:xeom5b*2ni p5s zxy1e er 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 resistance9,cnlxm .9vr4) egffsfyhv30 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 platinum iss 89p e5e5j:vn13qo u cr/undo $3.9 \times 10^{-3} /^{\circ}C$. 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 6 f-p7mt*ps6n f,ncr0xgsptu *et73 p the melting point of indium. The resistance of the platinu3prspcmf6g fxe7*nt0p6 -*ttup, n 7sm 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 thrupg jf, .p52nrough 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. lo y*3beq yw5+ 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 how much vtjt,qjc4lpl,oz.z v**kj y( :;xkt (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 ino y6 -qw3om hqpli7( :u;u9yfs a 120-V cir i m;q-:7hp(ofuyuo6wlq9 3s ycuit?

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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. Whatc o 0n,bksl8;mj*d t6d is the resistance of its heating element?c b *lo8k;d0,6dnst mj

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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 rat5h h1 w7qzliva)3c/csed 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 ra j+q8zpd+vj*rh8 t nf)ted 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 d cj,1alo;lr g tnw8uky /y,t)a8i86uy 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 bulb. If it is used at m.bb0/apxu kcu5(,zm 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 itssxq lu* 8qyom.v8c. u3-9iosi 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 op-4uneiv 1mcygi(4cs 9 erate a 25-W soldering iron for 8.0 hours, if energy cost1 (4 u4m-9ni escycgivs $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 h.ehkg(mkq6xhd0 ,:s7 s rgs1 cours?

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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 hkaftq9+3w 5pix of3h4ours. How much heat energy isw34xhkf59 apft3o+iq 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 6-:bm* gyj:a. qdphn zand 160 A-h. How much energy does the battery store?6:*j bzh :-m gpdqy.na

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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 iron use in 8.0 hoursmmapbn3 h *3d(?

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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 10ku+y+ )c. eh.s ezwu+x hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to operate the bu+wc.xu z+) u ekhe.ys+lb.

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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. Ifndlouyr51dp37. me1t- , ybet electricity costs 10 cents per kWbo5npuy1-.37ed t dtl ,em1yrh, 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 r+3o3 hhdqhx;g7wc 0bv unning a central air-co3oq3vdh g;w hxc0 bh+7nditioning 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 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 geneoav, q f+,ol.:m quxn+rates heat at the ratolq+,v: q+u fan.,m xoe 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 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 (u 8(empp71v eujvmp+bwb$8.0 \; \Omega$ 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;y8k0d h gtxy0 $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 ac9ib mv*ub5s3 hjc,wipl.2+n t the rate of 2.0 hp has 60% efficiency. How much currenns,lj3 m2hubcvc .* 95iw+bpit 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 powefkfcz 3/a8s gw0z4o-a r source. What rms current flows through thwacoaf04 3zz/ gfk8s-is 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. What peak current flow4ss; 06vz al voe+v0wo+5 ofv+padpe:s through tvz+f;aep0ov 0s+eo 6dvs+w p5lo a4:vhis 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 p4cn09xllb* hto a 120-V ac power source. What is the peak voltage0 lcnphb*x4l 9 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 l,4-uxna7z e b d-;ftgwire 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 elecb- gne,- d7z xf;4ultatron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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