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习题练习：Physics Unit18: Electric Currents
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 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 electrz;7di.v h3ayfy;iuz+a*-z nm icity by transforming chemical energy into electrical energy is called azz ;z+ny3fuay. -mv;ad*7ii h

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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 bh0z804p;hxtd k+bdpfull cross section at any point per und0840kpbdp; tb+hz xhit 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 current is takk0i *+axoimtyjf( ;y9i) os,6ecgc4 jen 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 secondmz:bq3y 5qy0g3.c eavrk4 i4 r 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-hours." This is a measure of th lc-m s6en qf:s n:/lzwg2l9i8eir

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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 ishs55rfmp 6) j b2yy2ey 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 wirt*2lo u(a3 u vnj1sv.mi*qp8te 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 dfn,l:x pg7gxu+ 2,gaz( z y;xcepends on

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which conducting matesbwg9d1n b a*v1 95fkhrial has the 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. One has twice the length o.ekzgf/0n6tn v7t )mmf the other. How do the resistivities of these two wires compart g.6)0e7nmkm/vfn t ze?

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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. How do jj p5n5s(*o ffthe resistances of these tw j5*f(pon 5fsjo 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 cross-sectional i 1-3m w* nlejpyuykmf9 43es;area of the other. How do the resistefmky -e4s 33lmy9i j* wupn1;ances 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 t9n) a9a),hou0 njs.-xmsvbf has twice the length and twice the cross-sectional area of the other. How do mau. 9o)-n0jsxft h9a,)b snv 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 rgc4: 3 lj*ucdoadius is doubled. By what factor does the re4dg*cc:lj o u3sistance 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 diameter rod elo3 br8g07pxhave compared to a 2.0 cm diameter rod of the same length and made of the same materiae8b 0o7plxg3rl?

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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 metal/r zyp)w(3 o fgi ,hzi-rc , 42th5)f.vktxvrls

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coeffijd-qdhuahox( 08 ct,( xm*ec0 cients 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 to/r;*px a qz.kv?

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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 ee.t:uldff; u j7jklc6+,,w mmquivalent 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,fm2p- hkpy.) v the power dissipated by that circuit w 2.pfkmp) h-yvill

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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 constabk .vh-z 6dej lm9vk*cf6/ek5nt resistance is doubled, the power dissipatedz.vvelfhk cb d5*e -96/km6 kj 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 current flowing isc f*(l:qo7cza doubled, the power dissipated by that circuit willlz: a*c 7ocqf(

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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 constf0o /v xkd6f6/;shar vant resistance is doubled, the power dissipat;o66v a/skr h vfx0fd/ed 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 demand, the vos -j9ixljrd12ltage output is reduced by 5.0%. By what percentage is the power on a resistor affectr-x2 1 djis9jled?

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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 w1 7x jbsev 9/cpzyh4o.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 /y7ymm 5(oxa1 o2zrt nwires each carrying a current of 3.0 A. One wire has twice the diameter of the other. The ratio of the dyyoztnamo5x (m 7/1r 2rift 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 essentially zero at very low tiqx(x.vz5 w/xh8 tl3b emperatures are referrxt.w lx(3bh8iq xz5v/ed 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 flowi:g3mnw, n,sj bng if 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 electroplfrd0ncti ai3*1c6,s *s uuhn6ating apparatus in 2.0 min. What is the average cc,fat*us 6ui01dc3 i 6 nnrh*surrent?

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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 1+72dc 1 ndn5jw .ppkof0 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 flowin2 15u*okzppdq g 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 4mw2,djdkt pc5d3we9s/ f k/1hvhr ,uA of current, has been left on for 10 min. What is the net number of electrons that have passed thrsu,9,chrt3 w4/v d 12dk5kwhemj/d pfough 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 fd te)tl .cmojrw8:2(mg of silver on a metal part by using a current of 2.0 A. How oer m8tltwd fc2j):.(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 caq.bxq nl1 :0f*83-nlah d 2vfaqf fho-use 4.00 A to flow through a resistance of 330 Wf *a :q.f2loxn-hfn0 qlb8a vdh3- 1fq?

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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 current zu;7vnk -+) 4c kpoycythrough 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 2dymwu fsnii, ov t.q2in ,,;5-20 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 drawnq,kaag u*(ec4msk(p :ga2 m )s 1.40 A of current. What is its resistanceug 2cse ,*akpa(m (gma4:n) qk?

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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. Holez 70 q-6edk*ff pk zq5j oirx+,su62w many electrons flow through tqkdkqso6* j 2 r,0i+ezl uf6f7pz x-e5he 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 resistancl t8:o)fajg /ne of 1.0 m copper wire of diameter 0.40 inch? (The resistivity o :8nt/a)fjlog f 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 d2pz2p+l sl6muiameter and 45 m long, if the p+pu2llms6 2z 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 1l1r 1jwsf3v gbpv: 2m60h dllwire (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 (fgzc,e7)pgd nv7w1/bg enm 5: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 0.04d;w aq;3j j luo-at5;9s:w;ts kfj uk)0 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 z4ilwbn65cg* radius is 0.321 mm) nichrome wire if it nbc 5* gi4wlz6is 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 rectangular cross-sectiowgca 6):n le(54zyra f(o5ihyn, 1.0 cm x 2.0 cm. What is the voltage drrgaa: o i) 5nzh6lw(fye54( ycop 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 0.50 mm and a resistividk(sg19mt 8 oqy- i;eyty 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 (res w lpyu:7p2nw f;)rc/iistivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 r fo(9vxz4y)l$18 \Omega$ 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 pla ,z*woc;vjqjq);6foh tinum 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 f,3aw7 itjvw8 point of indium. The resistance of the platinit, 38jw7 fwvaum 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 m .g zc,m:nk4y$10.0 \; \Omega$ 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 will it dr2ghzcg/mr; 2f8q ; gnwaw?

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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 cmcb/c wwg +l*x4mwe -nk;/v2current?

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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 bu c063k unmpjoahn+hhd 0o1 8v+lb designed to be used in a 120-V cirao kh8d+0v 3p1nmhonj 6ch0u+cuit?

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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 heating 1mmb fn41+fxbelemen 1f4bmm1 nb+xft?

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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 9y j q6b hk7ivu,rxmqez.e+ :fmsy3:4 rated 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 ratel7i),nidc:dze6. d:f xtwk -ne+yl5x0m a k1vd 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 issg: uq1oya0nr6m2m 7s 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 V, what is its resij/q2 y zqbgahx-s4s2+stance?

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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 u-n3ulu sld, 90lm * 9tao/uwbon 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*zo*+uevg.rp5vh o sd)-p+iw(zi i.q energy costsepi oi-hu i(gzrov . +q*z* .+)vsdw5p $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 use in 8.0v ow;1jvnt x42 hcn9fb-byy 99 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 fpjyo6 j hyg9i33la y-8or 2.0 hours. How much heat energy is proy9ol83y -hiy6 j3gap jduced?

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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 batter0 iviy:q-g j/(5 zf prr:votl:y store?f5g/i0rqo:yzr-:v lt ( :ivjp

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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 solde4uaafn) wf( ) cro3y18ap.uq ering 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 day. Assuming the power comp :()n9z rxgnadany charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to operat )xgdan nr9(z:e 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.r i :. b v2vjmb0wna-7blwx.j32qts ,w If electricity costs 10 cents per kWh, how mx2q.j-b7. b3wwivwsm2t lnv: b,0 ajruch 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 hyj+.+oa ym qa9x.m)ncost of running a central air-conditioning unit y+jm.a)9n+ qamh.oyx 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 oper) qwk(5 at/diuates on 240 V and 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 5 (wkqtaid)u/ 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 throu e9kwbl6ml76m gh $8.0 \; \Omega$ 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 costrs,mt jgs3.7o*l9de6kes w le0 asb-1s $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 sg3tpdq03gcm.0e*v uhv zxz+o y0 0i 0has 60% efficiency. How much current does it draw from a 120- vu zs.0gz3xetg0 0dycpmq*v+h03o0iV 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 powesx yv 5(04w ;wfz;rofpr source. What rms current flows through thx fwy0;z;ov fs5pwr 4(is 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 peak1, *2ui1rjjawi .wxc,t bpj 7t current flows through this depxcu ,wwi.a1t,27ijj b*1t jrvice?

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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 co ,dp3a,3dea/qf2 ybd dxoh58mg.grv* nnected to a 120-V ac power source. What is the peak voltage acrom. dvx2f byg3d dqrha/dpe og58*3,a,ss 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 copper wire is 0.081 inch. The maximum safe current ahtlz +h m(6b7gy ;foz;1yzjcz9: +s a:xn-dsit can carry (in order to prevent fire danger in building construction) is 20 A. lzoza6h bnz+y-jhx; f :; gya79(s:d t +szmc1 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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