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习题练习：Physics Unit18: Electric Currents
本习题练习试卷来源于题库网 (https://tiku.one)， 为试卷打印版，您也可以在网站平台(https://mail.tiku.one/)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://mail.tiku.one/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 electricity by tr,k5,izc s t+/svjl ,w1ioavy /ansforming chemical energy into electrical,z k+ ,/o1vv5lwyji ,tcsisa/ 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 sectfd9f9jc-)uih ion at any po d9i -uffjh)9cint 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 cs8s: o9t/wwx z/24kpg2rn5riy xf5 vkurrent 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 afyrpowty ub:q6 /buqdh . tt/+t4/)* ls

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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-hou cq6o *rzsf* 8w7zi9: v2mk :tfeqiq,zrs." 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 is defined ,hr,op 3teq:r 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 0k.p :72*deff r:hjx uceko+p 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 dep6e cct5uvmy+qj) 7vr0 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 value?m*4a *z::nx/n k3 vvypaf0ave

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two copper wirest+yslvqh e(qfr k0r a7f:yid68af:1.. One has twice the length of the other. How do the resistivities ofdh1ia:y q80e fv :(7kq ryfsalr +t.6f 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 twice the length of the ota t n-po;.5ws z6kwqk,her. How do the resistances of these two wi5 kn6p-wqko tzwas; ,.res 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 mx13zm3 on/o48oq kx.f4wvh tcross-sectional area of the other. How d8 x4qmwkzto3 fn/omx 1 vh.o43o the resistances of 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 has twice the length and twice thj)j ;o7+7zhys gkfwe . ylx)y2e cross-sectional area of the other. How do the resistances of these two wires c7 ojzjsgx+ywe7 y);.h k 2lfy)ompare?

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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 anydwi0 wda( za9l3 a-x1d the radius is doubled. By what factor does the resistance 1aaxd 0wad (9 wzl-yi3change?

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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 doibh w en;ug+e96 r5hb8es a 1.0 cm diameter rod have compared to a 2.0 cm diameter rod of the same length and +b5e8h;u bnhg69eriwmade 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 comm;5mhg v/mcuc0a4b xb/ on metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coeffici-x; ml872g r rolwr94bbvymx+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 equivalentpest15j r)nd : 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 equivaley:zs(v7b 7b xknt 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 constugtnssrobaxk:+.8 4h b q/b r* 8de:8kant voltage circuit is doubled, the power dissipated by that circuit wilqxr *kb8h:bo.rsn tu+/seda8g8k4: bl

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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 ci plt2)) knzuf-twtep3x5(uw4rcuit of constant resistance is doubled, the power dissipated by that ct)kuwx 4(pz3leu2t p-)n f5wtircuit 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 circslhk se6-kb ,,pmxp(oe0 w. 3h:yn6blx ;0krouit with constant current flowing is doubled, the power lskehsb( opx.p6wh-n6:kom, 0lx0;, 3rkyb edissipated 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 crl. 6bikwie+d y9n3 z(ircuit of constant resistance is doubled, the power dissipated by that circuit wike3(l rid6 w9 zb.yni+ll

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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 voltagejg0wuf /cdiajf++-g7 output is reduced by 5.0%. By what percentage is the powd/+ji ujwf70+ ag gf-cer 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 g w1fpy217jx,rc vcj: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 wires each carrying a current of 3.0 A. k+ czr3c1/c1 ywsmv +b9 s;fiq, xfz(e One wire has twice the diameter of the other. The ratio of the drift velocity in the smaller diameter wire to thax+ f,q ccyf3be s r(w;i/91cv mzz+1skt 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 resistivitf+enigrz(r c c(il:thf+ 2;, ny becomes essentially zero at very low temperatfl z ( (ficgrrn,2en;+hcit +:ures are referred 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 i)7 y;k 5bniga/xb m6msf 0.67 C 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 apparatus in 2.0 mince,mv5r) (nwfv 1goolmo 9w)7. What is the average cu 951mreco(g7ow)vl fo)vw, nmrrent?

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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 /l3ux gz,s8sr:wj+ hsky*4 vq 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 ifc j: ok1.pxx-86kvm vf $4.0 \times 10^{16} \; electrons$ 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 fau+ethk i r)1 )y5qs+sor 10 min. What is the net number of t+r 1ku5 +s qihey)s)aelectrons 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 pg oe4t -p/zhv7,g chnyl,8(ggrocess, it is desired to deposit 40 mg of silver on a metal part by usingg-4en l,/c hpgvt8 y7(o,hgg z 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 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 througny1 k ys6pi*kk;k, ap9h a resistance of 330 W?9 nk a,ysp ;pkki*6k1y

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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 resc4m1 9nm1ul i5dzaev c6 izq18istor 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 V. ey j+vzd1t;,i (y2 khkqw)n0hfg/9qz 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 1jzmmlr h0x/0*f9k 9* oxgo1ih10 V draws 1.40 A of current. What is its resistance?x*9k 9of0g hh l*xm/zrm0io1j

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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 electr*hjg k +n24,q7ep wtz9b(zkgbons flow through the wi92z ,ez4+b*gk(bqgj kwhp t7n re 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.lu patfj2 2)/x/srlc.40 inch? (The resistivity of copper ru)c 2j l/alx/ p2ft.sis $1.68 \times 10^{-8} \; \Omega \cdot m$.)

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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 1.0t. (vv bp4q7ex cm in diameter and 45 m long, if the resistitepvx(q . 47vbvity 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 (resist skl.i:ayqi4 v,epr7q78ke5u ivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 (resistivim) q/leh-k z-nty $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistivitwmm m92ulcn)4 y?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the current tqox4vpjv *bbin5.:, ehrough 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 reso4 p5e bjqi.xbn* :v,vistivity 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 )kw 66u brlffnz, :k:yand of 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 ofy) n,fkl6k zbr6w ::fu 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 0.50 mm and a resi(z:voiq2zo6k r*mq a :stivity 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 (resistsr;ywx 9k 3j3dux d(; tbljr n3s6rs.6ivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 hass,p ili;b jb bn( :k;qx6lw1 m4w/ysd*b:omg- a resistance 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 res a 9qux+91qkn0dkyo0cistivity 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 determ 8*27bh;o+ 7fmqa emzsup-ilu ine the melting point of indium. The resistance of t uf7i-*e+ 7zlp;2hbausmm 8q ohe 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 through an nh7esjwa(mp0wd o 6b/.m ,t3r$10.0 \; \Omega$ 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 x3vk *cl 1ldq wm6/j5ly 7y0dxwill 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 cc(7n*.i5cs5h d (af:uclitzy urrent?

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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 100ry2gxpw a/(j7i*7 wa h-W light bulb designed to be used in a 120-7( *xgh 7i2jarp a/wwyV 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 aky /cic c040/jf sa0pwt 120 V. What is the resistance of its heating elementsp0 /c 4ijkf/0wacyc0 ?

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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 at lhg,;0cdr4hi:, te du$1/4 \; \Omega$. 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 ralkt y2wvg pdp24d3qq6x62n t .ted 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 a0pqakdt v*d,l3 opeg(m 8)q1at 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 V, what is its resy m2)cw sc mnr7719jjmistance?

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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 l)d4; oraw4d kruns on 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 iron for 8.0 hours, if +nvb-lq 4- ku+jer2wvenergy costs rj-4b -qnuv++lk2ve 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 light bulb dl0mm0m 4kym7use 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 li f/8qnis;etp :ne for 2.0 hours. How much heat energy is pfs8qtn ie:p/;roduced?

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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. q(nt/. .3d us-nre jji How much energy does the battery store?t/ni ej(nd..-3qs urj

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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 /yu c wbao0u)2soldering 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 p8r pje 34(;szfiyb(o-h- cin cer day. Assuming the power company charges 10 cents for each kilowatt-hour of electricity used, estima rns-i8ofj yzcbehi c;p 4-(3(te 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 peknm:41mtex/md m(3gso wg1n29v du -ylc8: jcr day. If electricity costs 10 cents per kWh, how much doetm/gj8:yvgdk1 mu x-es2c(c: 1mw moln 9dn43 s 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) 0ijrbbe(a 8i5electric bill 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 5.0aibj0e 8ri b5( 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 and genq0jelofx1h39 k0k hb z 4:f2v2j8wjunerates heat at the rate of 2.1 kW. The heating element shorts out and, in repairing it, the2eh2 w0 z1l f4jxuk8vj0:kb qoj9nh3f 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 through;t:eibf, b9t5tjtj 0jz y4g y0,vbsa8 $8.0 \; \Omega$ 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 costs5ujm,f0jv+sash/s1 q $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 rate9 1ikrz2xd86;o jpu6 ja+wg qz of 2.0 hp has 60% efficiency. How much current does it draw from a 120-V line?a pz9g8xqiouk;6 jw+rj1d z62 ($1 \; hp = 746 \; W$)

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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 sourcawc5un9 yfj z 7;*vva4pmox. 6e. What rms current flows through tv4x*7yuf56vc9 ;zma . jn owaphis 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 poweyu;kudyws0fs5,ort/ j-* 3ed r source. What peak current flowsyoj53 r euw, kfy-ds/ *dst;0u through 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 ty )zmmvd5y; f ho00ees5ib3l 3he peak voltage acro biesv5dy 3zfhe35)0lo;y m0 mss 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 copp.yvvr7m6 icz+ er 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,vv. 7m yzcri+6 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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