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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于无忧得胜-网上国际课程 (https://5edu.win)， 为试卷打印版，您也可以在网站平台(https://5edu.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://5edu.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: admin  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 eleo7;ap,xwp+5s0na s eix24hgoctrical ene, p ox5ng2;sae+4i0o7s xpwah rgy 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 fullm*r0 o 4(ar:2rmu.v ge xc8ggr cross section at any point per unit of tirr 8cxm amv0 ro:gueg*4g .(r2me is referred to as

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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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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 diq nf1eg mzrw62;tsswba5z8 tp;v2 v )9rection 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 sa lsbms(biwg 3:u./5 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-hos 8chsgnly*. ycxk5:8urs." 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 wie6q k-wxe98 ppsy/ buoej )o1(re 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 isesz 88 r.a7jzz

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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 dz47ab2uf uoreit0 u 2+epends 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 resistivi7m.x03;j,zhc+huvbek gsxf: ty 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 twicelqfk0 )wvq-ob+k jxe 0 m/1q7r the length of the other. How do the resistivities of these two wireswb+7 1-/o0ex)k qvq0ljmkfqr 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.9cdt t9ep65ia One has twice the length of the other. How do the res96tdpeta ic95istances 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 twicg4 v82ckzssz ev; 1e(ue the cross-sectional area of the other. How do the r su;gs( v1c482ezkvzeesistances 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 3nneh* izk2p6nw)r x1 and twice the cross-sectional area of the other. How do the resistances of these two wires comparrxnp)ien6z w1h *3n2k e?

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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 anzl1oze)iw4aeywu rko1;/b0 57(b ) va gae;rkd the radius is doubled. By what factor does );0/ ;ik(1aryblwzvrk4oagb zwu5e e aeo)71the resistance 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 resistas uppgo7k9u5v)mv +x)nce does a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length a5s)uux +)ppvo7k g9mvnd 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 metal1 5 vbwi0qfozg *jtw p/v0da;4s

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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 resistdyi3r 5sxxg 3p;6vj:d ivity

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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 o6/l k:t y7k-paf un/eto?

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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 equivalq45v75m-rk e i .i-6/z1axi3rxcdom6whqprrent 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 ,cyhd0j2 7b5ycdbg 7 ma constant voltage circuit is doubled, the power dissipated by that circuit c2m0 jdy 7d,ghb7y5bc 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 constanthlm,noohr tn l 5.,95r resistance is doubled, the power dissirhorhn ,o.m5 l9nt,l5pated 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 flowing is dg a(s/hxdc4r 6oubled, the power dissisg(x6 chr4d/ apated 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 thr4zn5 m. ;zrc) gekj;haqe we-1c0ky/aough a circuit of constant resistance is doubled, the power dissipatedh /zczea gnjm-1c0r ;5ykw ke4ea;q). 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 by 5f-,churisy76s 9x4yh:t i )c f.0%. By what percentage is the power on a res s-yr6c4hyf cif:7 s xthi9,)uistor 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 respq bng4-iq; pq)3ne ;noect 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 wirevnmu e - 0url4nyd3,ms1 o(ot7s 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 diameter wire to that in the largeo4e3l0(mtuynnr, ud vo7m 1-sr 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 th.llh8ai lmm de+,k4:)qsg-n ye resistivity becomes essentially zero at very low temperatures are referred to:y,lq.+8h akms- 4mli)d ngl e 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 ifz yj jrt/31;aq 0.67 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 electrh xdn0gln+*6thdbcc 48/f1zqoplating apparatus in 2.0 min. What is the averagfnq /l4*h8 1gbdc+t60xhcnzd e 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 curvp )tc :yo4g6uv he2ub)i)m. zrent 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 flowingo bl/4z-rer/b 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 .tk uu xrv/6h.rmxm67left on for 10 min. What is thur t7vr.6.hkx 6umx m/e 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 desired to deposit 40 bcugaoptd. dey-7c /n3vv *(np7vy :*mg of silver on a metal parn*/c3vbcp.un tega: y ddy p(v7vo*7 -t 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 difference is required to cause 4.e)oswi91qkpbv9 um x:ec;97 y00 A to flow through a resistanx7e i 9owsc)b9 1p:kuq9 m;eyvce 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 current through it is 5.0 9yd /,yo/wk xrdzjpg;anl /+;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 currq 5 (j;unfao4olma kxeh3b2vy6-2h0 lent 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 cuexe4il 5(zej5 zkld*5dn1* ltrrent. What is its resistance?d1dt*eee j4 l5*xi(5ll5 nzkz

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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 re .unl*6lfp my.et(ma) r.zx l;sistor. How many electrons flow through thr m;x.nmeypfu(. l6a )*. zltle 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 wire of diameter 0.wonw5i -)iw95j8qw7pn,ujc c jlun*:qm 70gt40 inch? (The resistivity of copp5)u, cm0j9*i uoq 7:wn-t w7iw5nqwnljjc8 gper 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 diameter b5,;v)azpbcd. cq 2q xand 45 m long, if the resisti5z bq )x.pbdva;,q cc2vity 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 (resistivitylhscy w tbhp):t.. +x5 $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resisn)aw:b k d:r/ttivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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-+xy*3 laub:j*+r( vrs ckx ar, 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 1 xh*us-2r*7rolndmj go43f;j 0.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if i2* 4hmj7xn rru3d-fljo; osg*t is connected 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 cm x 2.0 cm.o+gcdrwk6i :l,1bzle rl62 ztg(m z.8 + rr dg8m .i:6,e zlb z2tlg1wkzolc6(What is the 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 wire has a radius of 0.50 mm and a resistivit6xvd vnq-yu kw* s*w62;emt -qy 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 cop 0rd81p*jtvvrfc; iym9hua:/dc6i1 fper 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 resista7q z0d;9v)c yhcb8aamp1-rcxnce 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 resistivi(ojvh k2s 5cw67x 4ixnty 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 ind 4 jdssl/+uz:fium. The resistance of :f4 d/z+ lssujthe platinum 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 througn/p bznlu g;l,0:lhe7h 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 current wic; i/m7i v(lofo lh/(tll 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 ru ca ml5vrvj1ek -4h.x3nning on 110 V 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 qu tvc1hgugn;c;. ;4 rw t /gk(3xm/hbto be used in a 12 gucg3hvqt xc u/ r;b /hm;twkg4(1;n.0-V 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. What is the resistance of i *p csy,wdi.l9rm-uq8zk.hk (ts heating element?mlr*- 9 q.8hk. ciysd(wzu, kp

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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 gyo 1 a7d0n1ge-uzhe uff)5qwk(0aq7$1/4 \; \Omega$. 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 rayv w253. wbjcjted 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 does it drlyv9o(e )( hfvxfor+2 aw?

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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 1:pk +o .-a)ghtr3w4* om ycbay20 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. Whic osupz)r+-1weh/v sgt50 rb/ 4 g,bvat 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 8.0 hours, if energ(ikfpjdb 2p.npb8 znw hlcc3b8)c0p)(rm8 y;y cf83n8bcl mrbbzp)hpj;k (py p2 d(w)c 0nc8.iosts $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 lip1it, lef. 5vdght 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 aezpt,wjua1b(q. 0 .ta 120-V line for 2.0 hours. How much heat energy is produceue.z.(aq1tp aw ,btj0d?

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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. Hohd8iq :qtmvv:yyx, (7 w much energy does the battery store?:78ximdy vy:q(qh v ,t

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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 user g2c0/mk su;h l)sd; p1cq p2h6lhjx8 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 com90mzcrsc rk: +pany charges 10 cents0rcs:k z9rc +m 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 (computer pldf-v*ru bdjk) aiqh c+ 2xxy-x)1 uf9/us monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run tx)b 2v+y1ch*-rfuduj- /xi9k) qxd af he 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 runnin2:uk /m -njcdq/n gyw4g a central air-cow/k/ ncj- 2ngu:dy4 qmnditioning 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 gener0nmv m-*8; +bf xvxztrates 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 depend on its temperature.) What effect wil0+mvmf rv*txznbx-; 8l 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 *bp yumla 54/lthrough $8.0 \; \Omega$ 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 costr0*nxr.pct k imqyc81c7h0u1 s $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 psqh z1qhv9y q(d6pf7 dyf( plr4l; :12.0 hp has 60% efficiency. How much current does it ;9p 7:(4zh6ylv(frsp qpqhyd fl 1qd1draw 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 current flowsjotzau) ; 2/lz through this dev)o/a;t 2ulz jzice?

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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 pobqwbr hk0+x7o0 5t*zjwer source. What peak current flows through this devw 0 *k+xt05b7 hbzoqrjice?

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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 pof9p1qtd,c:q m c-pb o)fy lk gq;2wf(9wer source. What is the peak voltag ofc ,9()cpg9;:pmqwkft 2q-lfyq1 dbe 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. The maximum safe current it can canp qv pu-g8hd .p)(n(krry (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 electron carriers in-( )ppv dnnk(p.8 ghuq one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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