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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 by transforms3 qe/ ex5ht(2g yjuap- :bnr; 3lud(ying chemical energy into electrical energy is calle3bdj/2eqeh:sxtr y;l 3pn (-g( yuua5d 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 f2veq rynex9u 57-*t zmull cross section at any point per unit of time is referqv5 mu9 7xnyet -e2z*rred 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 current is taken to be the dtstuc66/jb, e5 sbnp8irection 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 ,-a; blt fvt-1oes+gk 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-hofsfhy x-g:4.8yjia jlz5r8rq+; 7xa vurs." 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 wj 3e4,l6b3f2icbs mb6xz.qig ire 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 wire i amf6*by 7o )hvliu4o9s

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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 depends onfoxu v 7) y1c:)u djp(9xuk2az

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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 lowest7 (hch+*cgzk0v.r b 4 mdgn9iu 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. Howg 78:rb;fzqujl(6 jid do the resistivities of these two wires compare;:7uij6r jf(g8z lbdq?

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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 tb:d/ 9hu+mmf q +,hkohafh :g1he length of the other. How do the resistances of these two wires compare?+,m/o1h:d :ugba+fmqhf h9h k

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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 area of the o +s 5;brzf)d-5dc4m5h*kxge otjsvj/ther. How do the resistances of these two wires cskof dj)* /-4xbvce55;tsdm5zr hg+jompare?

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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 length9 s-(k hcwh pdocd7+b2 and twice the cross-sectional area of the other. Hocc2+bkh9 - (7po dsdwhw 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 q2s7tld; o, *uenruk-xf9nl3 the radius is doubled. By what factor does the res;nkl s2*-xu3n9u7lte,f oqrd istance 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 diam,1 w0 *suynuqg 0ld*rxeter rod have compared to a 2.0 cm diameter rod of the same lennswy0 *uq,g xud1rl0*gth 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 0.y6f(k vld1/nmigvh metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficik l hdrdp+vb:-jp,d9: ents 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 uviq32p;j q 3q cwcpjfv-3sw 331cy:pto?

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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 equivaleihjah3) y znbbq863 j+nt 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, the power dissnmyz6jot o/+ 2ipated by that circuit wil+t2oozmyn /j6 l

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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 resispew8u 0q6 zc.ztance is doubled, the power dissipatqw zez8pu.c 60ed 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 with constant currew4.w/gye i 7hjz:/mw xnt flowing is doubled, the power dissipated bi/w hm/.j:zwxgywe4 7y 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 resnl 6kz6o+tk1 y6ieg. mistance is doubled, the power dissipated by that circui1nzgm6oy.6ke lik 6+t t 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 percentdkryxt)v/t :+ 6qs 7c2e-psi qoiq(n0age is the power o+ q-qtst2 xv/6irskip:nyqe 0d 7( o)cn 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 wc1o6 x/azihz2 ith 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 wire-bt 7sjqr:pk3klh8y qr7*hq6 z0+q kjs each carrying a current of 3.0 A. One wire has twice thqb+ks8y7j htqk q*r7q ljp-0z3hkr: 6e diameter 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 esse1) a0fl hh):pyd cvpw)ntially zero at very low temperatures are rpphdfv0 1 )ly) wh)ca:eferred 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? l,)hir ovdj5 fqn*)3k

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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 app)9j(q)97 suyt nx rafn *qc8cyaratus in 2.0 min. What is tq *9tj)fcr canq9(78nsxyuy )he 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 for the current to be vdip4 4psiou5uu.f 9d(l8k /m0.50 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 ij1fx , y) a/6yk1mkk*1jw kck)a mqw;hf $4.0 \times 10^{16} \; electrons$ 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-v8q di4dfga1v yj ,+yjca6 m06u-cxk 13.5 A of current, has been left on for 10 min. What is the net number of electrons that have paju-+ y ad0 cig6qmy v6xak-f1vcdj, 48ssed 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 depositl;m4 1 k (ggjv/7ajltb/uv2 ke 40 mg of silver on a metal part by using a current of 2.0 A. How long must the vt/(v1jju 4 lk/;mb7a ggke 2lcurrent 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 requir xv:fq-kod5 a9xfr5 d.ed to cause 4.00 A to flow through a resistance r5adok.q :f-vx5dx9f 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 curk4 aftq 4 /:d okzl5z73v(aipyrent 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 co:8*we 86isqbzq;gk xonnected 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 is its rea7- + w/(pfqihl +qso5zd:wo usistance?(5 zq7dlp+q/of s w:oiha-u+w

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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 conneczjyiv,0ko wn su0-r(as)97 tf ted to a 100-W resistor. How many electrons flow through the wir)s k 0n,isoa90 (jwu7yz -frvte 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 ref4 sr mqi+b7suahw8*/sistivitq8u si f/+warb4h*7 smy 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 in d ok75/q ve7rs+t cn7 ahi.z(gyiameter and 45 m long, if theyqvr(7.7t nga z/7 kc+i s5hoe resistivity 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 wi v*ihhm3- *ievre (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 (resistivitgc6z:bl va5 ktpjzv /lq;z r,;6. 4jcny $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 o4 9.uq8 k8xfons; 3k1oldrbelong, 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 through5 7 hh5aznzi6r 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. (The resisthzirnha7 5 z65ivity 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 o f5y)c,pp us20 w1zsvtf rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it carries 4000 A? (The resistivity of copper is 1p2t) ,vssufyzwc0 p 5$1.68 \times 10^{-8} \Omega \cdot m$)

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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 nichrr*; jy,es 2gsie4vn9rome 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 wire (resistivity b uuuc9vev*pfl (ex:.d *k78a$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistp2;.n38e+5 jwn;gqvug3 ek0xw dp u otance 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 resistivixg7g l n,: mdd./nl4:bvvzz7xty 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 omqoxy 8sb*k 2(z/e79ix 0kejs if2*nlf indium. The resistance of the platinum wir/if e2k7 k08n2 jyo(i9mz sqsx*l bex*e 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 throd q+-+:. icz 4-m2q pt) yussisuid(ziugh 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 ra4 c0)nr ,vgx-qrmlcwln 3b6v,ted at 1200 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 drg7ni *h 3u/k(zxet 3 *fj,xzhgaws 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 used in a 12no/96 xvi;v k1) to pdz2reen.29ioe6ek/v d v .npxtoz ;r)n10-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 isdr2p(cg ajhhhrd:)( - the resistance of its heating elemenh- h(dc2hgd)parr:j (t?

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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 lgik)8 vt9( + u h:z)afvbw)(mvs8sggrated 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 rateda-8uutck+ tb l-w 1;bw 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 itzfq vi0lb )4ya704yktkle-p* gz8ig* 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, wha2 qqh 6m2e(pvpt 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 runs on 110 V. What g)gfr 5za w:i4is 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 enerq8ii- tq6ig0 y*ncn dv*(h k+cgy costs cg*8- n0 dy(qv6nhti*+qici k$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 buw.84hxuqw5 yulb 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 connecteh7datj w/-n6b n/ry 7jd to a 120-V line for 2.0 hours. How much heat energy is produb r/7a /jywt6nh7j-dn ced?

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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 much energy does the battery su0 jc,5p 0k9qsxk v gn6 3)usuvznmfj:; )lx0rtore?:x vu005gz vu s9 pfk;qcjxurs 6) ,3mnj)n0kl

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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-lnh :ws ygqr9k;/u4j2 ;u;y7ab3fs lwW 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 hoursg 8q6 -krcah.z7k pb mmc9d.e0 per day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estimad cp. .6r ab0mhcezk9m7-g8kqte 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 day.z12 v42)uhws:v* :usrh, saadr0 pa*sar4 dlj If electricity costs 10 cents per kWh, how muj:*s 2v42sahr:a)pdl, sus v*4hw 1z a0rdr auch 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 r *vm.ts.d qa (b4ad:xpunning 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 items contribute to the cost of the monthly electric b d*tp m.a 4qd:s.x(vabill 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 generates1e y j6zxf20 z azprm*7khlq.4 heat at the rate of 2.1 kW. The heating eleq. 14ml* apje kz0hyzxr276z fment 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 t9ufr a9*k3:ughod2a e hrough $8.0 \; \Omega$ 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 fa(wh/a2lq :j $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. How much2,,eqxrjz6 o2t j* zv g5uryd +q1va4c current does it draw from 1*t+a5ov 2jzqrqz2,6,4c vgxe uy jdra 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 vxzaol5 s-a)7 flows thvzsx7o5-l) a arough 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. W)sh a-sdgb.:sui84tpk wzc/ :hat peak current flows throughb:ph4g8ka)ucd- i/ zssts.w: 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 ac power source. 35hod7 mnb4 4wla(lqiWhat is the peak voltage across this devic7whq bi5d3lom4ln (a4 e?

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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 safe cupp sr8n k17/wprrent 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 electron7p1pr w /8nskps? (The number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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