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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 by transforming chem1e ;0alsw.f msical energy into electrical;0f ls1.awmes energy 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 at aml7gtjk+3 1ff8 s tb4cny point pl7gm4k 1+ 3cff stt8jber 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 conventio .rpcvm5u()oo n 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 the same asa-lara n)2)vcsg dy92

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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-hours." baeva5 .dzdpo r 17sziw,::2yThis 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 wir.of9l3uwy ajm5 x,xj *e 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 ufz8:cqpc; u-6ym;dls

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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 wir ;lcqgx0hvtywu/ixry vclcc .0,996-e 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 resiyhih2 ,x /ruo3stivity 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. How do the r3q+sbt8c o1uq esistivities of these two wire1tu8 sq b+3qocs 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 kwd;a:4m9uzj wires. One has twice the length of the other. How do the ream: k9j4dz wu;sistances 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 has twice the crd,mdjmp ;q-njwt *t/g ,1vpc(oss-sectional area of the other. How do the resistances of djc dv*p n- m mp,jt1/(qtw;,gthese 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 has twice the length and twice t 56c htxm3kxc:3 rjln(he cross-sectional area of (cjhnxcr5 3kt lx: 36mthe 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 doubled and the radm) k(s :naxt2hius is doubled. By what factor does the resi(: kn)xth2sa mstance 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 difgc qv:6 jw x0m4vyz:e1j+ ls(ameter rod have compared to a 2.0 cm diameter rod of the same lv0 sjf1:lv:(+xg jc mqe4yz6 wength 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 meea: bo69qnkgdyj)91c tals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficients ofs)xh jm (d3hw rpm1m+5(hrl 4eqo6ge ; 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 equivalentns *gbl2)qj9b8vi(2umn yko p5 6w2lq 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 equmtvk*-gv1dab: / cod9 ivalent 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 pow+,0v t vnwxf*rer dissipated by trv*+xt 0w,vn fhat 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 res +(hz(kmqm-rj4w4w og*gxf( p istance is doubled, the power dissipated by that ohm4-rxp4(w q(mgkzjfg*(w+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 doublon+ f q6of iued: 6/hy vyp,fhvr7l 0zu*(x6i:ed, the power diss+e6n0oopi,ixfdh6f f7u/6q(yzlruhy ::v *vipated 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 o;mlq/:f3f 4b +po 0rrqp6k sxzf constant resistance is doubled, the power dissipated by that circuit wp0f 6bk;z:4/f ql3somqr xr+pill

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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 outpuplpj a*mks :7at5hv(qd2 ot223doi* ht is reduced by 5.0%. By what percentage is the power on a resistor affected?3popt2 hja v* 2a5ld*qhki7d:(s mto2

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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 referltb*)dd. ,yvgbs6xk 9o6wk p/red 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 wirp8s-j*ex qat 0+9lk5lurwj w:dk) m4qes each carrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocitldp-eumt90r* 5kxwk8w:qjsa)4 + jlqy 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 becom; pye(ikfk. b0i9(qomes essentially zero at very low temperatures are rk q.fk;i9po 0 (im(beyeferred 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 of1kob*fm4q8 rhe /v2srax )em) 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 s*a3s75crjhu a z:wf, through an electroplating apparatus in 2.0 min. What is the averag5 u7srwaz 3j:,ca *shfe 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-(3nww hj(nn z 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 zgn m :im1(igs +:1hlbif $4.0 \times 10^{16} \; electrons$ 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 10 min. Wh4flk:jk/,;jur9:2jgo, :dddj f w bohat is the net number of electrons that have passed t ;duj:4:f, r bk2jj g,/wofdlk ohdj:9hrough 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 mg of sile-, ;fcz-7e kxnc;i*p xwx9n xver 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 107ci*x nxf-- zcx;ee9x;p n,kw8.)

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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 re). l.qxx dzt6-z wz)sksistancezxl-6zk.dq x twz)s) . 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 cp:i/ d):1wgrn.ldw rg urrent 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 of)oi6lgi0x5 connected 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 b2edu,wr0e7d of current. What is its resistancewdbr ue ed72,0?

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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 fo 2ho5ubsznz5( wpmvb 4c8;a; low through the(o2 z855 b m;szvo;nhbw4ucpa 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 diametenyt nvw0c+w m5y 0l;y5r 0.40 inch? (The resistivity of copperycnnly+ wwmyv 5 0;t50 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 y)r-rr 8 8 ljcai1ux7i45 m long, if the resistivla8 cx7)iuy8 jrirr-1ity 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 (resistiqm1wgy+ v p:n5vity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 *tpg(d wd3ys f it)e(3l04 sbhwire (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, measures 0.040 ohms. What is its resistivis*a5 1rqcgfaa+ q+v 1nty?

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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 lx(ugn8w/ :lj kf+ q9ekong 22 gauge (the radius is 0.321 mm) nichrome wire if it is connected to a 12.0-V ej nqu8k:(f g+lxk9/wbattery. (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 xqxfr0r8m 0c95 ks/ ztv9zi6dp 2.0 cm. What is the vo0/vts9 pz q0 mrd5x8i6c9 fzkrltage 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 wire has a radius of)70h-/i2*0xm fa dczkrgwm gk 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 :cuofkpu:k0h9 6k 8hd wire (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 ress0n+ m:j8h wayb: skx(;p bux(istance 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 kw2: amr)1;ypb;wlrwtvh 76qresistivity 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 melhao(eo oq9p;tulb t 6w3:p8l .ting point of indium. The resistance of the pl;l8ett(p:lq oabw 936oo p.huatinum 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 thro 2(kdz7 3i3b. udwii9*nme zktugh 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. What cur. 9lvyf t46qwxrent 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 hp,cds0c7q h f,,jim0h.xqu-r ow 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 l7,n pvf ;oryo.ight bulb designed to be used in a 120-V 7; ,ro vpnfyo.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 thequpmf *w:k;:w resistance of its heating elementw: f :wm*kpuq;?

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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 rac 0qczhv y/n rpwa.*0,ted 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 rasdtoy l+*kwti,x1 ; 2qted 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. 8 foy+anv3z4g If it 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 is used at 120 7vzlgxn wayp99*-jj 9 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 runs on edkd2rbq o)2:110 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 iroxlhm -c)y38tg:i ;zm *9d,p3 z pawxsmn for 8.0 hours, if energy cod3mgzm,ip w*: 8-xmcxtplza h9y3);s 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 x 9ul;nly4bs. 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 ila2;bhc*,nn for 2.0 hours. How much heat energy is2*h,cnlni;a b 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 atj5x2rku wulq1 8 84eh 5wd8byw 12 V and 160 A-h. How much energy does the battery store? dw 5ww2 reb q881ux5uy8ljh4k

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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?elzx :s :z)zo98fb 8wm

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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 day. Assuming the pohvi 7h.60-4nd muljz eq.iej7wer company charges 1i4h.77. q0 unliee-h v6j mdjz0 cents 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 mon is0p3j)kl:vp 7se,jsbm) mx(itor) is turned on 8.0 hours per day. If electricity costs 10 cents p)jm,s3)sx 0lv j(ks ip7 peb:mer 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 c-3 xr-wrkv -gmost 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 items contribute to the cost of the monthly electric bill if electricm wkv3--r x-rgity 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 generates he u-/:bo+uw r(oqf4s ts0)eaj lat 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 dissipated in the heating (l4a-u0joq:/rwt fse sb)o u+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 through/os q7vdxe.;yat-c. 6kbkv z7 $8.0 \; \Omega$ 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 ekt3)kf ,ek2eis2iv( $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 much;/e1yg. vo c7la l3ujw current does it draw ewo3l j/ vcy u;.17glafrom 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 flowsj9dqqqzq,t,z,7ghe z+m b.+p : 9qbk x through this device?,7.qq :p hzmqqgzj9z, e9k,b++dqxtb

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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 :m jt pthv8ynw5m6/mo)7 ;ov da 120-V ac power source. What peak current flows through vm 6:w/o 57mjvy;mnoh8) ttdp 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. What is jl84+5aoq+iwps ftn 7 the peak voltage across t7ao54 lpsin+ 8+fjtw qhis 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 copper wire is 0.081 inch. The maximum safe current itvo 4pwke(b7b6;s e hx(nno)t- 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? (poe)e(7;xvh6 tbnkn-sw(b4 oThe number of electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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