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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 electricity by trans.(2idib sg l xipzx7*7forming chemical energy into electrical energy (l7.p* g72 ibixxdizsis 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 throu u/ r, 7h6z;nshpi7wfb1+kqzlgh a wire's full cross section at any point per unit of time is referred to znquf,hr 1 ksihw;77/l 6+p zbas

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The direction of conventackv-8p+w. 1 ed x2yyiion 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 ranf(-h6nhtq47 m;xuv:a1rk 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 mw)xvet xz5;2deasure 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 wfz*xlws2lf 58 hier 4/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 isynpdcrbc-h-e56 d6 vu1(wq / s

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The resistivity of ahh26jsn ,+;lnw bhbi 0 wire 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 l ztqqc* -go1m g *a+1zp8v7qcsowest 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. How do thes7v-mt zi2/e unpyg 60 resistivpvg -7 m0nestyz2u 6/iities of 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 wiresg*xn ox1+zmbv)x bp.5. One has twice the length of the other. How do the resistances of these zpm)xnb*b5+. 1xxovg 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. O6 ,jq .8grfj) :t,mx3ry czcd0x9irci ne has twice the cross-sectional area of the other. How do t cz,xr )cr6.jqmc gdi ytx3i0r8jf, :9he 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 the cross-svia k71t9) :nnzl-xpoectional area of the other. How do the resistances of1 -: vtxnk opz7lnai)9 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 radiub0+qil0 )i4q5mupa zno2 fe4ls is doubled. By what factor does elfubn44+p)i iql5 qz 00ma2othe resistance 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 diametcj,ul yu0 s* xe*j* c2q)dtc7oer rod have compared to a 2.0 cm diameter rod of the same length and made of the sa)xj0y*c* tcs*eo2dqu ,uclj 7 me 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 como5e2eqz n, p /b(lid95smw j.n-7x qhdmon metals

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Negative temperature coefficients of6oi 6o23zkd0d l:gqqvln 3- tbr)wm11ryt,li 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 equivalen 0do/4d7xyov nki a 5dn/xq:7rt 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 equj;he2i8kh8- m k kpfsf/*amh5ivalent 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, t ( hf;bj)xs(yi cf,0ophe power dissipated by th,sxo0y)( f;ph(bj cif at 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 resistance is po ia)s5qvgm o,jt: 1djz*.,pw7cff7 doubled, the power dissipated by thtc,g*.p7)sqa1 w:iof p7jvd fo j5 z,mat 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 gxp 9,7off:f x yski+zg*.xs*flowing is doubled, the powe,:so ipg7gx *ksfyxf9z.+x*f r dissipated 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 circu 58uytwm8rjx, it of constant resistance is doubled, the powurmwxjt, 5 8y8er dissipated 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 voltage output j 1; 6)j:(kqure/uq anngcd2tis reduced by 5.0%. By what percentage is the powee knn tj1:/6a; jgr()qd qc2uur 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 respect to time is referred -h ;jci kf0h-ip e14otto 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. Oy:sca)hl s x/35e rml:ne wire has twice the diameter of the other. :xe s cly3:hm)/lrs5 a 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 essentially zero at very low tempe)3q:)lq f.k6 ja rnc/g :dbegdratg)b: g/k c jd: e)ndlrqa6q.3fures 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 if 0ivffuq4/bvv n(a3 j60.67 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 c :bu +x *)12/3 j* em1setwr-ntgfpwkcznm9 selectroplating apparatus in 2.0 min. What is the average cum*t+z-92p1ncsjk csw fug/ 1)e:wrn *emt b3xrrent?

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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 0el e+kfhf::8ra9g da)ha0ca 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 jx9.k8rd f /1evveyw8; ff2uiif $4.0 \times 10^{16} \; electrons$ 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 le lr.:fiqz4v+ gru o;r(ft on for 10 min. Whazrrur vi:of q4;+.(gl t is the net number of electrons 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 process, it is 77: u6e,j9 4 cs m zkoemt:ruo.dlrxz1+6kdlhdesired to deposit 40 mg of silver on a metal part by using a current of 2.0 A. How long must the current be allowed to run to deposit this mur7cdm lk::sre17 6klzuo9, dh4u tm.6 ox+ejzch 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 Apqty- ;9k (rrx to flow through a resistancy;r(q-kxt 9pr e 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 r h7y9l4e isq;zbh;n o9esistor 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. What curk62ox(-vjym y rent 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.*f x(t so2,vqn40 A of current. What is its resistance?s fxovq*(,n2 t

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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 flow + qz6hfv5i(+td +aeel through thid fz 5l q(hv6++e+atee 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 mrkz.q7(9odty w o* x)5oq-bjl copper wire of diameter 0.40 inch? (The resistivity of d*xyqtor7l5w (bz9 o-j. )qko 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 6k1;umu1mvall5g39tl o6z 1tgh m cy5 cm in diameter and 45 m long, if the res to5g 1h5ul ut 619ml;vaygk3mm c16zlistivity 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 wisu-uktme.hel3k .mp1v;: ik+ re (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 (resistivity 6tz2 t)(marboj.hc c 0$1.68 \times 10^{-8} \; \Omega \cdot m$) 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 oe,tg2fj+n (sq0 o+ zz8n 1u9fguui4 iyhms. 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 thngq8i+:exv- mrough 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 8nvq e:+-gimxresistivity 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 kisn vo,eye8x3(g3 9nof rectangular cross-section, 1.0 cm x 2.0 cm. e9nyo kng3 e8 v3x(s,iWhat is the voltage 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 0.50 mm and a resp9qf *a- pf8usistivity 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 7)bd1w6i bhxj9oe8e -4 oglumn ldfk q18f.5r(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 resistance d*8i,iacx i 6bof $18 \Omega$ 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 resigf4ehygiry3 c,s0w)/ 35w ox7qzn aa-stivity 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 of fwwx i5 pk4 pg3-la*+2)ayoui indium. The resistance of the platinw)*4+i 3 ykuogpaawlix52-f pum 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 z*p:5h 6hi tjt$10.0 \; \Omega$ 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 120.d,b nzi*-l 8mlj8agb yrw).o0 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 draws how much cumr1c os c o.3te ,xiwfl2hxs;qo,0 1c*rrent?

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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 ligwsein/6tq oz: 6x/dy- :bt 6xfk6aql34ck j4a ht bulb designed to be used in a 120-V / tonfa6e4xw6d66:yq- qj ztcx/:3kk ai4sbl 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 the resv8od* ef0*so oistance of its heating element?s*de8of*o ov0

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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 ratednhj-;- 5ayj)-r x zwt-k fad7t 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 f3 a- bqak:ws72yffpsfi.47wy, zp ng-wq61drated 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 Vzj) n k)r9l;zk, 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 bulbw-g9.or-z u as. If it is used at 120 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 110 V. ;p; r6gle,iql 6rw t2j 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 su0clxykwwzw z ht2a9up2/x0 hn/ /zx*zg9*3 boldering iron for 8.0 hours, if energy costzzu0lz*03 /zypw bwkxh*/n /agxx w9c2t 2uh 9s $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- dprp(7wczr 4:W light 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 2.0 hours. How much heat enerx:e) z(;l zyd;j 1s*ltszr-hagy s: 1esa*(z;;rxth z lz-dj yl)is 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 battery sto il 24ergpetc;la -/2kre?a2epl- r ktl/c;24gi e

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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 solder9xw f wtgc-c -nl*a y9vb(wr4kje+/c;ing 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 hourskwhkl1y*q 1e cvi g)oa(m3 /m; per day. Assuming the power company c m13eaylvc1/m; h o*k q)(gwikharges 10 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 monitorluw;au.9dkc7 x fv18 0root .d) is turned on 8.0 hours per day. If electricity costs 10 cents per kWh, how much does it cost t7ud.v08 19fwdo a otxcru;.klo 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 bz;ych 3ci8f,bill included the cost of running a central air-conditioning unit for 2.y hbzi;3 ,cc8f0 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 dr9m(zryo0 qd/ uhpfc1.ier operates 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 unchanged. In reality, the resistivity of the wire will depend on its temperature.) W0 1fzqy r(u9mp h.cdo/hat 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 thro((e/65caljrhmqhr7i/1 ni26buapb b ugh $8.0 \; \Omega$ 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+ p9i5k tvgasw9 mcg+nf3h xf*,jp91h $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% effi) vn*iorhfye1yd mg/h0 27i7 jciency. How much current does it draw from a 120-V lid /hyonhgm 70*y i1ije7 2fvr)ne? ($1 \; hp = 746 \; W$)

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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 c b5ez7wy19 o(l u4sue120-V ac power source. What rms current flows throewus(9ley5o b1z4 c u7ugh 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 soosad *jf5 4k:murce. What peak current flows through thim *4ak:dfo5 jss 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 connectedc.-ertyb zlfik .,q j:1ptx.; to a 120-V ac power source. What is the peak voltage acrt .1 qtyxkpb, e .ricl:zf;-j.oss 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 maxim+ :tmbr(vx k:xum safe current 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 electrons? (The number vx+ m::(xrkbtof electron carriers in one cubic centimeter of copper is $8.5 \times 10^{22}$.)

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