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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 bs 0*c dapma)j3y transforming chemical energy into electrical energy cpamd0s *)3aj 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 )k lq5i, 5h jn+9d1u 5grlp+0dddy jgacharge that passes through a wire's full cross section at any point per)idkualh gq,d5 lj59yg5jn1rp+d 0+d 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 convena+yl,h8ot x3xg9 y) pption 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 is thekvnj4eje je z55.b* +ptr4md4 0(ijxt 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 i)m f /. vivj9mqq g/efaff:+7nn "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 is08*idx4)xub zttt)np 3r im 7a 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 wirszvwuim 4 pd(yz)x.:dw4c +6ie 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 des*o1tjcpg4o. fgt7z 9hue(/ l26pyto pends 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 resistivityff 2 y.:+gzqyt 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 lengthwmt . lgj1, 3a+cy1n rwv4rxc-av(g9 f of the other. How do the resistivities o9m+1agvvwt r14f .(l c , yacgj3-rxnwf 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 nt,792bb wuw:xk8yg *v m:ycz twice the length of the other. How do the resistances ok7nwc :x uwg8,ty2 *b9b yv:zmf 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 x .0iz i*x2ymlwir30aw8h8ap the cross-sectional area of the other. How do the resistances of these two wires xmia w8i 3ai820z0xwly h.p*rcompare?

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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. On6(cs 5qw: sqxqe has twice the length and twice the cross-sectional area of the other. How do the resistances of th5 6csq sqx:wq(ese 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 y6vgb66qv-pwx s0d :h y1 zl;mpjb70j is doubled. By what factor does the r0dm;lhyj01xzpyqpj6b vbg :s6v w7 6-esistance 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 6yocp-(5hjw6tu5 3fju+jwy o cm diameter rod have compared to a 2.0 cm diameter rod of the same lewy6+ujop(jty ujwoc 5- 63hf5ngth 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 m ps -e3elsn4a.ost 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 coefficienn +ccb9i-i(pzj.y.q :bp wbm .ts of 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 equivalendh r jmof 5u, ket9qr9m,4z/z+t to?

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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 to// :zek( u m)cdnpxj: e)9ymhr zn6ob*

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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 voltage5k g5plr(0i g9zw1bwh circuit is doubled, the power dissipated by wwr505kzgb l h9(gi1 pthat circuit 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 resistance is doubled, the power d 261)zmm eqib 5es.ssiissipatedm ee2imz b6)i1ss5.qs 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 wiqtp9oqllh ) 5k 51:1by4ex:r 2wp zmkrth constant current flowing is doubled, the power dissipated by that circuit or bp14pe:2kllrwtq55h k:xmz1 )q 9y 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, thetkf 3py a.;rty)5fya7 power7yk ay;)a.ypf3 f 5ttr 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 iso1)nyn)d7 cd jf7 riw( reduced by 5.0%. By what percentag nj)7dni1o)rc 7fdw(y e is the power 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 sinusoidal with respect to time is refecxv2 *g ,juyk1rred 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 ec. td)4uu 9azp.qu6 rof 3.0 A. One wire has twice the diameter of the o zept4r.6 c)u 9dqu.auther. 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 zu/1 n:t etmv5ri4z3js ero at very low temperatures are refee nvzu m/srtj1t: i453rred 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 a , ng.xm;nc/aC 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 ap.z+jy *p7 jvl9 p9vsjzparatus in 2.0 min. What is the al .pjj* +yvzv99jsz7pverage 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 pvk5 ,nxd2py)jot37 jt ass by a point in 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 e/,fsmly iy)w 34wf3 4qgj3xzif $4.0 \times 10^{16} \; electrons$ 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,;ihup 3h r0hx of current, has been left on for 10 min. What isr x,h0iphh3u; the 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 proces-i xjf )80om :dkrp0/m)gujc js, 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-)o jp8mjki0)gm fuc d/0jxr : 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 through a xhpy l0i34l xko4,gb+resistanc i k4p gxhylb+o,lx034e 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 isv15yhu 9dx0iao4 9u ii 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 current will flow?/wqz9:o cpxz3r 1h4iu

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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. Whav3b4+jh 0r v: 4yk;ihxj5gs dfy.g+cdt is its resistance? fjcyg4sxk dy +4 ;v+0gr bdh3i:j5h.v

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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 thrwm: pwpxzymy 4 5iy 9c,+rh8p/ough h598cw4 ywippp+ r:yyxz/, mmthe 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 0.40 inch? (The .jpx zq-1j* ;ld 8uomq/-nuorresistivity of copd*;1l/o ozq. uj qmr8j-x-upnper 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 and 4zd p);ksdsr m63ic 4k95 m long, if the resisti z)idscr64 m3k9;spk dvity 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 wirv.ck1y a2k d4yd n.r zw;v7ax6e (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 (resistime-xlj9y5 js9 vity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 t v*lj5j62 pz 9zqwh 3fqkz)v7z7upl3is 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 tfoor (zw .x5f4g1*ic through a 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if i1fg4r o*oz if.wc (t5xt 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 cll55fsx .z,qc m. What is the voltage drop along its length when it qz .fxcl l,5s5carries 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 h :ff6tv)ef8f kt)yl8d8 jq2cqas a radius 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 copper wire (resistid;1 wfi m+cp;tyorc (m24h5f ovity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistanjg-d pr e;op ;ef-e-tb*g(x a9ce 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 coefficienj:o/hwlo.j3 75k ncknt 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 of i oyld4y-:; hbindium. The resistance of the platidy 4l: ;yhb-oinum 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 an;xdm) bt hgvh0r qf0,/+:hn6 ryj*ijx $10.0 \; \Omega$ 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 will ity4m6soeh /ty6l-0 v oe 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 hta7pp8 u.z, 5jbwe 4zhow 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 res-ex xe 3r4(ix xjmly05istance of a 100-W light bulb designed to be used in a 120-V elexxj r3m-x y(ix405circuit?

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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 hk6f, 9airi(hbzt t. ;its heating element9tir b; a,iht(6. fhkz?

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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 ewydd,iw9r4 4xp1+berp ;mpeu1 - xi(s, qiw4 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.l9zgm 16o3wnce/itek.z jq, 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 1j 4 ixuxosz+w2 ;vrj,3 n;,gyg20 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 is used at 120 V, what is its resist/j,wi hqs2hb 5xo7bx(y9si w 9ance?

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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 its rmx e0wpo-d-4 uesistance?

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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 ent+q)mmzuf 09 2mfrt9mergy cosz+ 9tmmu) 0qtrf 29mfmts $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 z3q0ylsqiyp+au / p(*f 4cvf 6nru)-)blug-xhours?

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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 linl w yux6afbxh)f o94iv5z 5me)b71 8pse for 2.0 hours. How much heat energy is 1z4spel6 9 8i ovx)5f a y7fm)uwb5bhxproduced?

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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 1cva /oxd detm cz9se7ha)w7;: t+ w:2n2 V and 160 A-h. How much energy does the battery store?to w)tz naecwx/ e92sdh7ad7m:v ; :c+

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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 aq3xi74 ku +ye25-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 houra:l65 f ma+rs h 0gxwyqix5jk0,yf 5.ks per day. Assuming the power company charges 10 centk w05x i60 y5ha.fsm5a:j+yg l xqrf,ks 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 plus monitor) is turne/oc4m-4kfe+h /u gjke d on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost to run the cef chkmgk+u4jo-/ e 4/omputer 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 costc8(,2 voldcp( gytka 0 of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light lt(ccv( 2dko 8g0a p,ybulbs 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 h8 2ahu rj ;8k6p9vutoyon0h 2electric drier operates 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%. uohh09 v;82kuj 2aor 6yn th8p(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 thro)omm.- ) o1afkkpnh e0hf bu)k.zh4t.ugh $8.0 \; \Omega$ 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 cost2ly ;l . 6h,gsk:tgkbuxo23xrs $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 5dh/xyd o )as.7ji mg;2.0 hp has 60% efficiency. How much currenth)i sox/5m; jydag7d . 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 power source. Whadzdf5xx/1 r. -irbrn2t rms current flows through t5 rrx/.fbx1 d-rdi 2znhis 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 power09 xqwxlz 0/cc ;pxct. source. What peak current flows through thisw; xz9 /qxt0ccl.pc0x 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 ac power hjum:t(b n;tn gz917 bsource. What is the peak voltage acroh; b n7b9j mun(1gt:tzss 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 cop :.dq y,cs1sgxper wire 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 thg 1yc:dqss ,.xe electrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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