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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://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://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 be6s m tk+mg(kvn0 /aj,g lfe9l +bmn-9y transforming chemical energy into electrical energy is callmtl9-s+ajk f/ 6vk 9 m ngm(+e0ge,nlbed 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 secdkfd9w7 6b:.zx2+m ffrzxd r-tion at any poidw:dk .r-+7db9xzz2 fm 6frfxnt per 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 convention r 2qmt38,p *vwkt)0xyminz1wcurrent 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 the sam8 v0k3q y5i5i:rsi, xr+gayg ce 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-hniyfswhw/.z i0bl6-1x vw : v:ours." 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;c zi/1kvc+ gk 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 wireg0so *f3g+qt qh6zbo3 52 xpwm 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 wifr mo8k1kj r/v9ox sczu)7x47re 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 tm.rarob4 ee 1yi. )y/vsj7ht2 he 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. vq27:dp0ixbqOne has twice the length of the other. How do the resistivities of these two w: pd7xv 0i2qbqires 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. Hohp 3n4 47bw -ph0n2e 4lf1lourbe+ lvlw do the refh34v uerlwh4n2l1l bp4 -0 7no epb+lsistances 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 hadl2dzhf 8 wz0.s twice the cross-sectional area of the other. How do the resistances of these two wires cf2 8d.w lzz0dhompare?

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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 lek1 zky9bdf)tm ,m5 ehh o+ -qk+i1+ezongth and twice the cross-sectional area of the other. Ho -,kh5fk91ezqm dezhyo m1+oi+tkb )+w 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 doubled. By what factor doesli6tz j y/3lt; the resistance c36iy ll/t;t zjhange?

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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 2h h-rg:by2gmeh5b 4( y.0 cm diameter rod of the same len (: h rgbh4h-m5egyby2gth 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 meta*33u9k tjjdq d6 lxlaq(wha0,k n*wa(ls

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficientu,u*xxj g..qe2cfn - rt3 qxj(s 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 equivalent ycxdb 6.e ;tc dnt95i9to?

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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 equipp 1(tghxf9 :avalent 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 doubled, bq. : p :al8kigp+of;dthe power dissipated b:fogb+k .i q;l :p8adpy that 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 a5r n vbmhd/ww: 1gkr7jnobi5* 0 2n+xw circuit of constant resistance is doubled, the power dissipated by bk50or+ n:*bvwni7/hr wx5 gw12 jndmthat 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 flo3hggnds5y4(q(- cr bowing is doubled, the power dissipated by that circuit gqdhr(n( s4gyobc5 3-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 t;xx(y hn 2,bk)xxme edi8v9+a circuit of constant resistance is doubled, the power dissipated by th;kx h b98 ixt+()2 nxdxyme,evat 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 voltagerolxt gf3q-6w*- y4qpn )o2oe output is reduced by 5.0%. By what percentage is the power on a resistor af-f6el4xgr qo 3*) np2y otqow-fected?

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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 j +/xgbtc2a0x 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 eaqt*imn;r hnf27;;jnpch 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 diamntj2r n pnm;f ;qi*;7heter 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 ver5n,w/ge kdw e.58 y*adgbx* gty low temperatures are re55t, bxegykgw8w gen/dda**. ferred 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 jsi3sop0ou+)yh 3q(r u vl s39pass 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 throp)j-sbao+w *q(eg32mp mjt8 hugh an electroplating apparatus in 2.0 min. What is thqh2bmp) (o+w t3gpj* -e8ajsme 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 10k(u9;3 u-nxozlp7jzb 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 flow 3iw.pfho-krllw, 67sc aiul(qyxt ,2gx -*/ aing 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 left on forn+ c,6dun7a8uf e;u wj 10 min. What is the net number of electrons that have passed through the coffee majfu +d67,c8a;e w nunuker?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In an electroplating pjd ;mgqd6km+bq+,lehjul7 -s3inj 21rocess, 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 muc +bs1+m 3jjq6l7i-2 mnd;ld huekqgj,h 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 requir3sk*1p*e w8) ya9k rncur wv)xed to cause 4.00 A to flow through a resistance of 330 W?a)sv )1ynp*wu 3ex*k9r8 wrkc

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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 resis 33,ldkh7x uaktor 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 0l4 kqw :-ncwlb7n(nb 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 ud 8h,2hybno6draws 1.40 A of current. What is its resistance?2 b,h8ondhuy 6

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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 thj7t0nlx4v7xbd 7h vk/ rough the wirt7vnxv/h7 bk 4d7j lx0e 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? (Th/sm, kgk2e)c ue resistivity of copperks)2,kgmu/ce 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 cm3(fvw ad5; dqx 0bio 2bjvqq64 in diameter and 45 m long, if the resistivity is;qdd4b(i j5wq6xoba2vqf03 v $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 (rmbm vkh1c60kpt0pa14fsk 8 g:esistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resi-9jb-bpf b+ kfstivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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. r (y)sv6:tpcqm4jzr;u cgm7: 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 aj b64pjlyr 9o4k )+sbc 10.0-m long 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. (The resist49bcj)olpsr + b6j4 ykivity 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-sectis37scg 2(x7 4xw+f sdy8tfvd ton, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of copper7fc8std xvd2+ xst7(4 sw3gyf 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 nic7 hhvk4 yp2v:yhrome wire 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 wi (muw/q.vk3 -(jg jan nk;g)fmre (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 resistat+c4ny( ax7fr ghc e6h 3l6z(snce 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 coefficien ns1tv 48ewnse aj(8fl 6iy0;tt 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 indium. The resisj oary)5qf g0g5, v5wju(lh/yv o;/hcfqi- e; tance of the plf j5ic;ge 5h/raoqy, )fo/(;uw v-yvj5h0lqg atinum 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 throughpf,hl(xo(e. u 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. Wpp(,)ik*pnw chat 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 currentigdt.sbge7i(f /,i8 f v;.iic?

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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 buljl8:2k9 ap.chrx5pyw eb2w -w b designed to be used in a 120-V circw8-w ec2 9.k xajl2 rbw:ypph5uit?

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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 its /pbs (1:jbdf-2g tjf nheating elemen /jp1bbjf2 dgtf :-s(nt?

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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 atc tap+ ew .p+b8lf9t;i $1/4 \; \Omega$. 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 rate)h2bdhs; tc, +ywshrm rdyd .,5b.e:ld 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 q xtg5hrnx9lw.+9w,fe/hl1h 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 it-we)qqd)zuz4 s 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. What is itsf1qi7w8( mh mnsi8 c6m 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 ir 5bhk zj;:w.gyon for 8.0 hours, if energy costs5.y bhg;jkz:w $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 lign3oa2qa6 : fdcfzv4z ohc7g/0ht 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 c ct*4dbwi aav:n2a7 ;uonnected to a 120-V line for 2.0 hours. How much heat energy is prod vtaau2:b*ia7c 4wd ;nuced?

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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 1:r qa+n8enb, *eprrq 660 A-h. How much energy does the battery store?n rrea+, re 6np*q:b8q

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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 h e)aqlq+3z j;b iv2z.eours?

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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 ob --3wvn9l 1 atlij:o e4sako,n 10 hours per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to operate the bulbal ,e3n: 41-o-wlvi j9ks toab.

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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) b:qmna3d 8 qq ,k.av1ais turned on 8.0 hours per day. If electricity costs 10k81b: v.a aqnaq3m ,qd 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 included the cost of runni7/:vhsqz q/fum*sb d;ng a central air-conditionifhd;*mzqb:uq7 //v ss ng 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 an 70, y:lgap:vlgab1 pqd 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 1lql ,bag:gpap07y v :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 i-;orhal 6owe;4,hu b through $8.0 \; \Omega$ 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 costserea9is w3+/za o f14m $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% efficiencw -wz1u) 6 ppu0(m +x,ctgkecpy. How much current does p61p0 w( u,c+-ucpzm txgw)ekit 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 tolk y*f1sv).u o a 120-V ac power source. What rms current flows through this dek.ulyvosf )* 1vice?

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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 conyqj loj -c.,8 hu3ite(nected to a 120-V ac power source. What peak current flows through this del cij y8(.u h3,jq-toevice?

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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/mdfc7m,l cr1 1o6x .w(ggejg source. What is the peak voltage across this device?1g, x c/m.lw(6jceofr 1d7gmg

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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.a rn7:1:yfnwj 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 the electrons? (The numberwnn:aj: y71 fr of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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