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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 electhf, sw2m nkhlf95.z o1ricity by transforming chemical energy into electrical ene khzf1mfl s,.o2h95 nwrgy 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 sectiocabrv 7+*;1bbfk8tzlrjx (5ln at any point per unit of timez;t1j5vbrfar8k+ *lb lcb7 (x 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 i h)z/-hek:o x:v a9uhks 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 c0lhj ,n0z -rptt b2,tas

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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 ito 0nkww6m/ 6os 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 defi1bvbgh5j0f- al;m) yx ned 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 wik(57788)/clgmxx iwwez; ike hia g w:re 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 depen p7nalv1x: 4vvds 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?ls xg1psq0t,,

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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 w*gps.nbl;phq:uv4c)v2c ) khas twice the length of the other. How do the resistivities of thesegcp);:*u)spb v4qw hn2vk cl. 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 other. How do the rj sv1 4rg6:lmkesistances of these two wires comparr14j mgkl:v6se?

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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 thfuo:+vvh8cqaqb3o.a(/ 9ne r e other. How do the resistances of thesee(rq oqfuh n/:9a.c+ov3vab 8 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 v1ve137 w3d uv apy:gctwice the length and twice the cross-sectional area of the other. How do the resistances of these two wire1c:3upav1 dyw e3vg 7vs 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 doublerirlurne 9.8vf :y0 6td and the radius is doubled. By what factor does the resistance chav6i 0rnt.fyle :8r u9rnge?

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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 ) kax1jg(g/3xl5b oave(-0 sv78y jwur rq-kk to a 2.0 cm diameter rod of the same length and made of the s sg 3/jk0-rgay(q85k- ke )uorxbv( wl71ajxv ame 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 moc.z70ey nr63c* j;fn ;uezo psst common metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficie8 zrg7a mof7az,xsc 9a7 vvc3 9inq./fnts 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?nq.k(bm)jmpemn 1p+0

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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 equivaleg/ 8tb-t5u /0mnvwm ksnt 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 *r nihnh; 5yjk4 td.hc5axh n:i;p8k 9voltage circuit is doubled, the power dissipated by that circui;5 *. ;h8jph 9it cky:xhnk 5inrd4ahnt 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 ofbyda9 h8yps/8 fj 95vp constant resistance is doubled, the power dissaj9y fshby 8pvdp9/ 58ipated 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 is doubled, the imzya/g0c-)g j44g fgpower dissipated by thagc-)y0gg4mizj4f g/ at 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 resistance is doubled, tr5;y4x:sz b cdhe power dissipated by x4dy:5cr; bszthat 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 voltage output is reduced by 5.0%. By what oh)2ljq9n4r .jrt fm. : saq-zpercentage is t2lj rj :s-q.mazh.n) oq49 ftrhe power 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 respechb 0)ag o9rz0+g )lpmet 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 o yyd.n ,lr2ij5nnb 7u6f 3.0 A. One wire has twice the diameter of the other. The ratio of the drift velocity in the smalle y,.ny5djun 72l6irbn r 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 z1,lvuei5o vs,+7uli(zrmk i -ero at very low temperatures are referred to a +,m, vuour livie(7k -1lz5sis

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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 chargeeo a:g f94rp9rm p,ak1 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 inm;h-.tzjtbu( 2.0 min. What is the ave;-b(.uj tzh tmrage 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 poin2c 5r2egduyuy gkc2;+t 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 flowig:3 wzlh 3 koqqs9l+x9ng 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;y( sxzrt*h4oh :qe.0u):ums u.ubngwad*t / been left on for 10 min. What is the net number of electrons tha*b:s qzhot.y.t h4ur ;wx0m s*gu(u)/: e andut 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 process, it is desired to deposit 40 mg of silv 7tegu6 w2uq9 /wllnh/cvl m3ci7j;v+ er 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 si 3iqj+7h;lg tu/c26vwl 7l evwm 9/uncngly 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 through a resistl4 4svmb 2cio t-psa(/ance ob4o2 pvas4mc isl-/(tf 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 cut d1i3dylq *sg7w/4z errent 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. What current will flow?lizec;jp g;c /0 i-te;mxm/z4

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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. iy pjkhw5 -(3hWhat is its resistance?y5ijhh- ( pkw3

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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.oz ds4y:.ie f;a4z3al How many electrons flow through the wir4lf.dsy;a3az ie:z4o e 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? m3yd*kzhnb kv0 +*j+t (The resistivity ov3h* m+ 0kjdtbyk+* nzf 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 diameter 1* glg1g. 9( it vjald+)dmsurand 45 m long, if the resistivity ial(9 g+lmtg).1srdgvui*j d1 s $1.4 \times 10^{-8} \; \Omega \cdot m$?

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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 (resv;*mbux/ to ej;l v-g.istivity $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 wireyjg8 o;4vi 8nj9 )u-dsapk7sb (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 resis paabnp+ 8z,0uw i.-. 42amepun0pl qstivity?

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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 s9wq)uz5 gj9znmbe 3;whogrw ., 8y hu6z bp;:(the radius is 0.321 mm) nichrome wire if it is c,;u3we;mj g8 hgz ww 9q95 hz 6ybsbzn)u.or:ponnected 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 anm ,ef x4o/v/hitfz/6bd of rectangular cross-section, 1.0 cm x 2.0 cm. What is the voltage drop along its length when it car i,bfv/ x4/omhzte6f/ries 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 ret5eqy6- vf x-osistivity 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 (resistivitygkkm7v/ h s5 ovm 63*pcja:x+e7eeh 3t $1.68 \times 10^{-8} \; \Omega \cdot m$) 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 resistanceti-+- c/ 4 wis)ezlumi 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 resistivity 8 gsw 7 ffzp(*wfrtqjge gh;56di*o: 5of 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 useli24pl5 g:gc p b* rc0qxe-.bbd to determine the melting point of indium. The resistance of the platinum wire g 5.l 2p0p*- :ibxbgb4celrcqis $2.000 \; \Omega$ 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 throughk ss)p1u h3ixm, di.j9b2k kz: 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 ratezophtg)-gd1x am3c /m 8z djui*0+0zzd 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 runnin ;bckj8 hm0uc4sr*twcct41 ( hg on 110 V draws 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 de ps2ul.r6ne0zw (f8xj signed to be used in a 12z2un(w r.sex8pfj l600-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. Wh+..b na+ahg laat is the resistance of its heating element?n aab.l++.ahg

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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 am5sfw4-pl e ry5t+ e)it $1/4 \; \Omega$. 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 ratebn3qf:;6vi ;, czmav sd 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 cur zd 0rnsp*phvc;7: 4bzrent 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 resistance?tnansii 87b3rf u+:;p

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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 ih vlb )w(s yafxg*/hp+0z1 . +ykktlg;s 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 f);6d 9a pkgwcoor 8.0 hours, if energy costs cg9k ;wa)odp6$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 lq7rz.-zf v,wnl 9y8lzight 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 connected to a 120-V line for 2.0q udai(;fx-nmzd *:/p hours. How much heat energy isp:;dq-i*x madnzf u/( 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 at 12 V and 160 A-h. How much energy does the battmx690vo oh:bh,oa.t) wxmw- y rs:e :bery store?:wo) 6eax:tbbo-.rw, h9msoxy m0v h:

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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-W3ybfy7f g j3iu8r:k(o 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 hours per day. Assuming the0astnl5 ;gz5j power company charges 10 cents for each kilowatt-hour of electricity used, estimate the annual cost to operate the bulb.5 g0 ;zsjanl5t

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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 l459l 6ggvjxl-t9u ls plus monitor) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh9 6j9 lg-4gxtls vul5l, 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 runnix)o i:eaevpa7p2-yk 0ng a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of tek0:o -p2 xiaeyp)7eva n 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 and generates heat rq7kj 9rw0)w(y rorv(at the rate of 2.1 kW. The heating element shorts r9)0(7wrqkwr ov (jry 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 flowsg dt, - ;k8 kr5eltggk8:z:i8(phrovn 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 costs88px;c *isl pr $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 hasn ,sj,8-n gmtm 60% efficiency. How much current ns-mj ,tn8, mgdoes it 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 to a 120-V ac power source. What rmxdrw(yc/5p r 8s current flows rdp/ xw8c(ry5through 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 sour(l(5x kp ,pfyr 0iz(zrdmctny4u:nyy: -5) d vce. What peak current flows through this dezt0 dpm( cynfl rd:rvyy (kiun:x5,4p y- )5z(vice?

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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 dwlro6.po 9;pac power source. What is the peak voltage across this o6 wpr .o9;dpldevice?

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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 ,w7r0,eq3fr0 rtbv bwt5b ze9it 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 number of electron carriers in oqz9,w7 b0ebv,t rfw03rrt eb5 ne cubic centimeter of copper is $8.5 \times 10^{22}$.)

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