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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 transfo- ajak5t;o/bs;oay k 2rming chemical energy into electrical en bajo2y/; 5kstao -;akergy 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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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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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'j7 ewkqh4 l4 h-um(2xps full cross section at any point per ukjwxq(7p4e-hl4h u 2m nit 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 cur+c 2 tqh v8;n1kniw h4ft5)bplrent 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 is thcjrg.,9) k 0q nfdp1nte 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 "tc hnn 2fh5;484t6 g/ksh egfuamp-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 wire is defined as (lsws b)95fuf7e5hgs

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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 6d8ymbyi7/ph 50mf(tumuex0e yv/ :+e zzt y;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 de: ix*crio,x) o7xq/8h hos ez0pends 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-6c kme11u vcsui)f /e, g,hie the 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 twice the length of the other. How do: sr8fjw0u.kv the res8j s.kwu:fvr0istivities 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. (3 n*/sc s8ge0 bwchyn1qw em;bp 7.ny How do the resistances of these two 1w780 ;mgn h.bs spe(*3wn/yenbcycqwires 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 wirkv8 qdo0m+mli 5* 5csres. One has twice the cross-sectional area of the other. Ho05+cs* k8vqrmdoilm5 w do the resistances 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 hafrc e+ h8vri11s twice the length and twice the cross-section+c 1ehriv81f ral area of the other. How do 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 doublewg bjb1oa+xgh9u 4(,kd. By what factor does the resistakoagujw+,b14 ( 9xhbgnce 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 compareav.si+pq:ki z 3:fc *7czs+eld to a 2.0 cm diameter rod of the same lengi.c+ si3z:spc*z:l k f q+e7avth 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 myqz5u7/ n owidbl* 7i mt.r+(host 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 re pg/i b yil7mn68ovlv254q2resistivity

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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 to?sqr./* :gk cm .hgf3jo0fhd1h

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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 equiv rzeep5-i60 pcq*lrevx ;-/p5o y av:ealent 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 doubbmg;8m p +im.sled, the power dissipated by that circu m.i;m p+8bmsgit 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 circuirrvli u9+b+ adz ;u)d6t of constant resistance is doubled, the power dissipated by that circuiruz9+d )rli v6;uab +dt 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 circuitk y-i3s znvasiz)o.z4tsw6 . ( with constant current flowing is doubled, the power dissipated b(t .k zvsz3.wai o6i zy-)nss4y 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 x6s owop4oo+ ,through a circuit of constant resistance is doubled, the power dissipated by that 6p,4o +woosx ocircuit 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 5.0%. By what perceq.;. pf*zshuji,g 72h vn6vu hntage is the poweru,pg7z.2 ;vhfhu6jqs hni .v* 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 sinuow 0q1ru-ed5t.c5u kpsoidal 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 3uom5jss654 zr.0 A. One wire has twice the diameters6zju4so55m r of the other. 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 becomes essentially zero at very ,( lux6 p7cydwlow temperatures are referreud wl cxy(7,6pd 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 0.30 s?jjt7 m lk+m-n:

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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. W28i o.8(-y 4(bhlusrj fkrtbv hat is the average current(r-utokl82rbb.s8y i4(h j v f?

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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 th xv* .h3 ua7*;hoe 1yz:bdsjfbe 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 35j(jznm n vtv9m6s/ dif $4.0 \times 10^{16} \; electrons$ 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 for 10 mi.zs49ak*fwt wn. What is t9k.ftwa*zs4w he 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 mg of silveuws 1s/ s)um0 f+:4+nuegp.j dbyag+xr on a metal part by using a current of 2.0 A. How long must the current bpm+bj0/u+s)gx. :4yn+u a gdeu sfsw1e 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 4.00 A to flow thropkhv 0fqt3: ;*q0o(ri *xogttgvi)vx-r0tb7ugh a resistance of 330 W?hiv 3t* :0b*o) qqr0xpt(ti-kx r o0 vgvt7fg;

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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 5.00r ctsy3 *gnc2 wo6djqru2 6 qps12gb.-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 curr4ri jgyphhj x fsvf*-3pu ;-+.ent 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 5sw 5ybubf:i 87t(as+ fo;tbd,n7ci y A of current. What is its resistancebafi,;syuy b7+8s bc w(:idf75tnto 5?

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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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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 resistorcxnn0h,1i435yb wuw i. How many electrons flow throughny10, bi hcwwnxu3i45 the 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 pe4f8q( m pbl3copper wire of diameter 0.40 inch? (The resistivity le p bq3mp(48fof 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 diameter 40 ;c,veyesewve1 :jm and 45 m long, if the resi s,4mjy1we ve:;vee0cstivity 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 f)b8 vj*fu5+6xe m bjtys6mn.wire (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 wi 3u6 rd;a.svzzre (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 lon-c b: /cbl81zav 2fjgdg, 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 th6da+prg wh62mrough 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. (Thmd 6r w2g6+aphe 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 crosp n.ck4)gg+ njs-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carriesckj4pnngg . )+ 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 resisgj /4ovb*n3e8 gyz0kmtivity 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 (resistivh01s27 t lauoni0nuaf+zm3 d3ity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 ham+(i zp*(/yu3 dy5b gnsmb.qr s a resistance 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(,zk c(+tcbywfnsrv 6d9ou(q4tr)y . resistivity 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 o/2)9a;biqmpj oa u+ usf indium. The resistance of ips q/uamj92bua); + othe 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 thr;2w hdo-lf g45/d to-qyj0ko :l8ne mhough 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 wisjew z, 7 z :/nvqdwdyx(3-pf0uqk2+pll 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 currep(v6a s7gcodq.,g. pw nt?

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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 t 4z (byj9;zgrgo be used in a 120-V 9ggy b(rzj4z; 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 thed 2q:7 lc jll*2tykv2x 6mvp(f resistance of its heating elementplmkc2v2 ltdx6*fy q :lvj 7(2?

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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 a biu dnb17hgg9 5jk0yd1qd: 3ut $1/4 \; \Omega$. 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 n;flf7 mkdd+,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 does it dptku 7rk/r: 5isz*e8 fraw?

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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 8 fx;k1 bxw7/cyci3pph wts; *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 t2702q d2+nzrtlfoiqruns 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 8.09*ytj 8:dtn bi hours, if energy costs 8*dyn9 btt:ij$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 b tjlo4 om+gr,p6m+t:xrx 15jzulb 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 j1+:) z1m i;lapahdjg120-V line for 2.0 hours. How much heat energy is produd1 a)m;pgjzl: 1i+h jaced?

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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 ovv8:3 )xtl3hm-2gs6nuf og d-h. How much energy does the battery store?fxn82-36v l3stomvgh d)gu o:

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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 afig sw7j n.j2k9 4pj8b 25-W soldering 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 powevl1d )t8jct/p r company charges 10 cents for each kilowatt-hour of electricity used, estimate the a 8pj/dtcv 1tl)nnual 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 monitodl1z w 1ope;*br) is turned on 8.0 hours per day. If elecpbo *d1;z1wl etricity costs 10 cents per 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 i*t cx(swxg349:th ukmncluded the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light bulbs for 5(c9xgt 4w:m 3s uh*xkt.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 generates he19wztbw;j 65d9 uph3w 7t59 ckpzjw sjat at the rate of 2.1 kW. 7zw j1u3ckpds jwztt;w b65w95jp9 h 9 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 througva + sg3km;p +fpe*r adjb: 4qxtu03j:h $8.0 \; \Omega$ 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 y npk84xnczjwa4hddr2c n uyh )q8(7))/ew5x$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 lzy5e6g vrzfe1j( .rl k0di 8.2.0 hp has 60% efficiency. How much current does it draw .j6 gdezrzlfv.(1k0 iy l85er 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 curre cmat3dw/ nv.2 uv807jm2cxyjnt flows through this device?xn3/a2ucv jw. 2t07cdj v8ymm

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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 curre)odn7u9 ahe .d,fm 8i(wp.c9ul8 dgxunt flows throug de,hd(l .mogd98uiu p7xw8f aun.c9) h 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 connected to a 120-V :6)5us 9n cjrt o ckao*gvj**e31xafe ac power source. What is the peak voltage across thiou*j txce1 s69 na)kjcreo av5f:*3* gs 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 incl* pkmrycfocjd) 2b :pm66 s10h. 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 nuor6f:c lsm20p)1jkm 6 dpy*bc mber of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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