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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 int /dtp 1rbayq s)dt s(1vp)(se;o electrical energy is cal( tqd1) vt ep(s)spdb /ra1y;sled 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 section0 hi541ycrg *w*to fyw-5ck4u :zhpdv at any point per unit of time is refe -r5gwp c54df *yt:4w*ukhi ohz01cvyrred 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 con ee/d,-g+d ew0plbc1d vention 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 i8+ qmwvar bi71u+;ck xs 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 rat ma :u9rhk3*tted in "amp-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 p symz4,1fb *fgmv9w8 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 du/7eb4ikonxw8vvd85 0pk/e wire 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 wiw f)xl07ii,-fwuu 10d f( amczre 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 the lowest resistivity v ke5q(vk,mg7 eq(b: uvalue?

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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. Howt x)a6ltvrm o0rtkr b(7f;c; 5q7/org do the re65mxt rg;r o b/f7tk)c7o( aqt;rr0lvsistivities 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. ,sca s(( rh:t7zlof-2qw/jbl One has twice the length of the other. How do the resistances of these /lla jz qo-h2ts7c: ,(fbswr(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 to*45j7 uj t zvq8qn8hzwice the cross-sectional area of the other. How do the resj ujh8nzv*qqt5o8 z47istances 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 wireb.y)rz h 6ly+vs. One has twice the length and twice the cross-sectional area of the other. How do the resistancel b+zh6y.r v)ys 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 fayfm ,g9 t;cws.ctor does the resist,wcg9 ;fmsty .ance 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 cm d7 m v3*nho4uw f3slo4xiam7suowh f4433*o mvl xneter 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 metalg; o9inv6,*op 8xx ;sol 8ykjls

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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 ot hc1i b9c2o*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 t,h q )d,yj vnkz+-e2/sxh yhmvvu2*v9 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 equivalent tifms(f3 i+6+f jbrey6*5b wjoo

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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 v/dt5 gv5b*nzuoltage circuit is doubled, the power dissipated by that circu dzbv 5g*t5n/uit 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 resie5v biyl ber/lh1bn9nj41( hl+nw91 pstance is doubled, the power dissipated by that circuit y9l b1vl/n ebhhnb1p4j9re i+15lnw(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 doubled,2f c/)sr0dr*8m4k*jne u+h gr/ fgypq the power dis*+/d 0cgh2yfekqj4* s/npfmrr)r 8ug sipated 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 resistance is doubled, thei 0x b5ner,qd. power dissipated 0bi5n,dr.xeq 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 8(zhcj r oc(6gvnd z.rnc*:j*uced by 5.0%. By what percentage is the power on a resistor affectedvjzrd.j*gh(zr*cn( c8 o: c6n?

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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 sinusoidbwiz:zb1; x)ciov gdpzx362, al 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 avp v:f*qtoe:;;lli- 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to aof i;v llt v*-p;:e:qthat 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 resifm1+* cha1zx;bx n1 syr.dk;fstivity becomes essentially zero at very low temperatures are referreda;c f ybdx+sf1nzhxm*r11. k; 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 pobz5y / 9nk ajtyf-*r-rint 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 thrn0r fip d, gu)6um+w1fough an electroplating apparatus in 2.0 min. What is the av dwu,6+pgin)1f mfur0erage 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 u,3 h1p(ztl csin 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 if:xd d/-v,n;v 6hy,snt axtm w( $4.0 \times 10^{16} \; electrons$ 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 1my8x fz ea;74n0 min. What is the net nu 7x;4faym8n zember 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 lyaqk4r1;m7c ,p e es8mg of silver on a metal part by usiqc r;s l, 7a1my8eek4png 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-(-1p 520et,a z dq3jtchlwj6rp spwi to cause 4.00 A to flow through a resistance of 330 Wp0qja z-3lw 2(5 t ew,1trchpj6sdp-i ?

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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 ie99 ioeeq;c 3kt 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 conned5 n r.g2*e u32rbhtgscted 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 i+ v/gyn :db1 s87lbbdra. 2lfhs its resistance?br/gasy fnv7bb8d: 1ld2l h.+

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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 to8d).o7rub lgqz a b;c; a 100-W resistor. How many electrons flow through the wire i ozdbcla g8 u;b7).r;qn
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 ovdds6 (o4ff5af diameter 0.40 inch? (The resistivity 4fdd sv5oaf(6 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 rod 1.0 cm ifdfw- y :os9h:kma54 rn diameter and 45 m long, if the resist5:wkrodf -4amhfs: 9yivity 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 c. v ygy6ldj/.(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 wire (resistivi)nd72z2fmv :d 6 9jgqqsynycr7g95yq ty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistivit yq0 w4+d/6lpe ogp*2qr2 txyoyq-z +k 8pa3gmy?

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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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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 (the radius is s s 0(.oxdxj8v0.321 mm) nichr8s. jxsxd(vo 0ome wire if it 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 loyij di)4 nab5sl9qo35ng and of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resist4slyi q93o 5da)n5bi jivity 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 nf7 ;aq- nbo)bdpa7 )t0.50 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 (ri0r s6 f -xuq:*ab dmu*;uii3 7rp-wxuesistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistanw(wkpfc-wfiv2 q994 tce 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 coefficiex6ayg1h 64/,iwnst0j/ y go rg.tvh(l nt of 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 ofk.,p 5:4 ewtcclngfe bw96q( d indium. The resistance of the p6g: p.cwbe4e d 5f,(k9l wtcnqlatinum 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 through anq35vj npe3i26vd mtk: $10.0 \; \Omega$ 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 willxl5xer 06nm6w6z n fj( 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 o )ki-c ob*1j5t jo+sbV 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 us064sq0h2jwdltbr-,ef7r c a bed in a 126rbf hrw0d4 je tqc7l0-ab2s,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 on)yr (g i ht3w:dz5 1 glt((d)9ijvotof its heating element? v(:(to)rd wljgz) 3in (1i9ghto5d ty

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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 redm(j3b./p a m, njs+niug6w8ated 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 rated as3hzdvj2* 10uhzp(l 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 id)e a0 a/v.o swa,gzn.t 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 l2 6x f8x6ga.mbzz1piis 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 rvx8lvgvfbj0 u./bn(0uns 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 8.0 hours, if erg-. f4utl,-tv fhbq,e iz1j(nergy co4fg,htu-.q1 iltz b,rfve j-( sts $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.fvmr;vai gpvl 5* 05f 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-V line fd xhay/ wjh9+/,6 jgxjor 2.0 hours. How much heat energy isxdj9ja6 +,j/xh yw h/g 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 w2z hs-pd0 o5pV and 160 A-h. How much energy does the battery store? w5zpo02d sp-h

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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 hours n9 gc)psdc1:f?

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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 bu ymi4hq95o bbf2czao. o1c5-xlb is on 10 hours per day. Assuming the power company charges 10 cents for each kilowac yximc1o of5-2q9 bhaozb54 .tt-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 plus monitor) is turned on 8.0 hours pp8*6-effow s)4yuz e xm4wi3k dwpn*:er day. If electricity costs 10 cents per kWh, how much does it cost to run z ywfpi8uen wo4e4d:3-)6 *wpfk* x smthe 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 russn 9x3d1dwrz;(o, ,y8hethr nning a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connecxzhnwsrdte sd1( y,9,8o r3h ;tion 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 operate- g-t pmhus)q2s 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 will depend on its temperature.) What effect will the repair have on the power dissip2t-hspu -m)gqated 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 througir-6)wkb5f sh 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 *-fb )czljhyg)r p5w9 $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% efficiency. Hg ;9rjf2e;n:+ x sf8irxaz4qrow much current rx+fq;s 2r;ze: xg 89nrfja 4idoes 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 power source. What rms currenzhjib(x v c .((3egob.t flows through this device gxvzehc(.jbi(3o.( b?

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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 120kmp j,j9w2 jb+-V ac power source. What peak current flows j+9k j2j bwmp,through 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 connecte lx4o+./l yjgsrc5l1p d to a 120-V ac power source. What is the peak voltage across this dev x15y.j/ollr +pgs 4lcice?

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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 saf(u)oqfqk d-crx*0j0z 9t tc oep r.g69e current it can carry (in order to prevent fire danger in building construction) is 20 A. At this current, what is the drift v-u gt q)6oo p9t00zrd k*xc eq.rf(jc9elocity of the electrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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