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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 electricit6 ,vm3f).bwx n (vrgs+x-kuezy by transforming chemical energy into electrical enexwr .mv,-3(xvkze gbnfs 6+u)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 full cross section dxobqwjcgd,f6 n6h2 jc:6k v:; *p kf5at any point per unit of time is referre66 v:6:bdx fc wnop5 *;kfcjqjghd2,kd 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 curredsk5t d0/b 9nb+ q+honcrd-r:nt 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 )ikns jzun,gwz,7/c)is 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-hobewm3j0+deq1c vr* 2ours." 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 iz9: q. fu/+bp5qvk fmxs 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 jjvzp*g: lqs s3p1*s,+i8v ume 2rt v4gjgj*8 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 wire dep4r*oaqq j w)p-ends 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 vtq: icq hq9qexwn2;71d t3b- aalue?

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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/umq:)ok clk8 twice the length of the other. How do the resistivities of these two wires compare)uo/8kkclq : m?

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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. O k4rf-f+v.r tihew49mne has twice the length of the other. How do the resistances of these two wire ir+-k .4rwt 9fh4evmfs 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-sectional a* g.1 bxjy9ntsrea of the other. How do the resistances ofn9gxt y1.jbs* 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 hasn .k/cshd0k.vgx0b .a*( njtf twice the length and twice the cross-sectional areaf/(kv. kh0jds nxbac..ng 0 *t 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+plzhy . /im,k doubled and the radius is doubled. By what factor does the resistahm ky.+/ lip,znce 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 doeswxv6 1ib7* iurp:j j/o a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and 7 /1*6pbjwjoiix u r:vmade 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 comwns( 3eph 7s bb2ve(btfv/:k jb2+l7vmon metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coef:-w/bpkxde ps*kx/ /rficients 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 equivalen0a u23ybtwcb; 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 equivalentbqd *cwt57 yf9 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 dok smubh2 0sc27v)ti- mubled, the power dissipated by that circui0s7h)2 bvtkm2 usi m-ct 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 pow(aaz2 7fbu x*uer dissipated by thatxf(2u*a 7uabz 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 doubledxjl7o -(pd ,csqn0nm5+i 7qqf, the power dissipated by that circuit willnxq0o , -ql 7ji7mn5 +(pfqscd

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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 double0suxffq r .)pv/ ie:i;d, the power dissipate:iuf. q v)r/s0iex ;pfd 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 demandtqxe yb3pcx)h9es+3 5, the voltage output is reduced by 5.0%. By what percentage is the powereb9ths3e yc)p3q 5+xx 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 dt/,gjmyq3x: ef -9h rzdyp.9respect 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 3xw7 zg*/f21x7p1 uo0m(e if,m dcjhmw.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 larger diamx2ofjec0 ,wwm1x m1d 7 7m(gzfup*/iheter 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 low tempec .g6 0p veub s9ltzbv*gibfd).4e.r7sx52ut ratures are 2s .0uts9f)p *b6lr tb.7dbxig4 c.evuzvge 5referred 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 pa lsmy+)nhpmi30,o( co ss 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*.1q3 kg uyyogparatus in 2.0 min. What isg gky.3 *quyo1 the average 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 forel.ti5r)a djs,)-wp e 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 ipbyvb; v43ygm7bq yo/bz5 d,(f $4.0 \times 10^{16} \; electrons$ 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 drar;9b;/w qvhz27 eqk .rkihr 5rws 13.5 A of current, has been left on for 10 min. What is the net h 2qqwr7bkhr;.e9i/vz; rrk5 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 ribm* e4jeqww*); 4 oe40 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 thi*i4 wejbqore)*e4 m; ws 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 4qpun8 (1bo:r k.00 A to flow through a resistance of 33rp(8nkob:1 qu 0 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 curr;a4m5lo nfnhur kcy); hb* m7;ent 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 connecty/iu o3j modduh 9 /bex3/p8k)ed 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. xt f qvi6./u/kWhat is its resistance/iv ux6tk/q f.?

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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 co m4gse8s.crrmo94 6dinnected to a 100-W resistor. How many electrons flow through the wiresri9 .g64 mr d48oemcs 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 resistivr+d mv,k4 yt-dw5f7 uoity of copper+5f tm- udy wr4o7k,dv 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 4th eu3.:fn , gvzydcn;1,8 oyw65omoe5 m long, if the resishe8,, 6mewufg;vdn .5t oo13oz: ncy ytivity 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 t:a (uqv(zlt+hkvu 3z(gl(/e (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 f u49cyph q*k1d* df)m;szmf,re (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 long, measuresn toba,*9ukuwh(n m8. 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 10.0-m long 22 gauge (the radius is 0.321 mm)g5c4p bp8yd4 i nichryd4 4 pcb85igpome 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 long and of rectan4lif p3*chwb 8gular cross-section, 1.0 cm x 2.0 cm. What is t p w*f84ib3hlche 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 syu 26c,l. prn7huw)gwire has 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 (resiw9ca-(dyf-v t8hh g (mstivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistance of bp99o/g:m tao$18 \Omega$ 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 m rz-t9o hl;j the6a0d09hl/dplatinum 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 indium8)a7 nguz ml1vzy94g u. The resistanc zmy9nl4u1g)z gvua78e of the 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 throu)tw(2gi sb3sqc8chx: gh 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 12m2rol),wdd, c 00 W. 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:9yi u)7i. znl vdwkc* 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 ps j g;p o*atpa3l9c+.o;ea5jof a 100-W light bulb designed to be used in a 120-V ciro pt.;5 a eloap3gjapsc*;+9 jcuit?

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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 th (6v2g w;hnqf,c0pozpe resistance of its heating elementfpw2 zh g0,(noc;p qv6?

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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 ratepi wp52o6 ie;sgx. 9sxd 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 ra5j2c c-:b00 ktz+ghcrnd9+bni 4ragkted 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 ff;)w6r; velec -qsy6it 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 resistanuakxk+* ql n:7ce?

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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. Wh*g6vv8scs eat feb )7+at 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 i)9nez)eo pp0 soldering iron for 8.0 hours, if energy costsopz i 09)nepe) $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 (+hum5s-i; engly g; pa 100-W light 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 a 120-V line for 2.0 hours. Ho:h6l ka2t w3p1rrkr6 cw much heat energy6r12 :chkpr r kw63tla is 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 and 160 A-h. How muc,arbwex619: ,mwj m vah energy does the battery store?x,w1m :9abwv jem6, ra

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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 (qj8-3x -nlvgmyh6ww 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 ixu -uv0tq+d/day. Assuming the power company charges 10 cent-0i+uvxqt/ u ds 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 turned on 8.0 hours per dayr,e5gsj s ;v/a. If elecvear ;j ss5,/gtricity 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/lbyi26v *np l included 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 5.0 hr/day. How much did these itemslb l2/y*in pv6 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 :q0 l g,o*mk; lw+mmxkgenerates heat at the ratq: l k ;m+*mglkx0wom,e 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 thror.t 6/jxzrzy 7p,h 4fmugh $8.0 \; \Omega$ 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 costsl:u 8bmp5-x4 )eor nkh6kr/n b $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 wvbf;: 1*xgr x6zo rml(l 10atthe rate of 2.0 hp has 60% efficiency. How much current does it1oa(0 v1wxlx mrr ;btl:6f*gz 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 current nic* (+docj1nl* z/zvk-92 + ssxklqu flows throughx*2z -(sj/s nc 1k + v*+9ikqcdullonz this 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 s jz8pw v(eh5/-g,4i b:bbnzg peak current flows through njh/g 5biz bw-e(bz4p, v8:s gthis 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 sourcju- f.94qrj tme. What is the peak voltage across this def4murqj. -t j9vice?

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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. T t gh;pj:a bgkpy7vk q*/(y/q,he maximum safe current it can carry (in order to prevent fire danger in building construction) isy/ tv(jbygqg7 p/, qk: pha*;k 20 A. At this current, what is the drift velocity of the electrons? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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