16.09: In the circuit shown, an elevw/ 1k yzz679.df e7kdjcg.svctric current exists in the metal resistor connected to the battery. Which one of the following choices best describes the direction of electron flow through the resistor and the direction of the electric field through the interiorz.k7yv/z1 .egd9k 7 jc6swf vd of the resistor?

  98.06: When any four resistors are connected in parallel,:5f - pab4yo:oaukvh: the_________each resistor is the samfkp uv:4 :a:oy5aho-be.

  06.33: A current through the thin filament wire of a lightbulb cq/6ma7 bi2br e0/(s/si arpop auses the filament to become white hot, while the larger wires connected to the lightbuo0aei rsi /p6m2bp(ba /7q/srlb remain much cooler. This happens because

  13.08: Some standard household lights are beihl .qae/1 2wnf8hih0wng replaced with LEDs. LED is the acronym for which one.eilhnw2h1/h f a0qw 8 of the following choices?

  05.16: A cylindrical graphite r ucdi/j9.i) jt igo)1sesistor has length L and cross-sectional area A. It is to be placed into a circuit, but it first must be cut in half so that the new length is 1/2 L. )9i s/oid c.j)j1i tguWhat is the ratio of the new resistivity to the old resistivity of the cylindrical resistor?

  98.20: Wire I and wire II are made of the s :eqhmsr9ivh.l19l ,90 + sx gyaeik(yame material. Wire II has twice the diameter and twice the length of I. If I has resistance R, II h1:vlsl,q kx0 9.h +simeeya9(h 9igry as resistance

  99.31: Wire Y is made of the same material but hasxjsovo zaba+pz .8w1y+u+ + 0x twice the diameter and half the length of wire X. If wire X has a resistance of R+jw oz1yvx o+x+.+pab0 uas 8z then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L muv o+s w-p/tpqt7: y+h iio5(and radius r. This piece of material is then drawn so that it is a cylinder with new length 2L. What happens to the resistance of this material because of tym5o+v(p ush-pi wt7qi/o+: this process?

  07.27: A junior Thomas Efw sqkgd0/ gqsru+:( )15omr fdison wants to make a brighter light bulb. He decides to modify the filament. How sud 51o:r) sfqkwg(0r+/sqf gmhould the filament of a lightbulb be modified in order to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistor*g :cfl;tt0 vrs are made of the same material. The length and radiu c:t*0lg;vf trs of each resistor is:
Resistor 1: Length L, radius r
Resistor 2: Length L/2,radius r/2
Resistor 3: Length L/4,radius r/2
Which one of the following choices correctly ranks the resistance of these resistors (R1,R2,R3)?

  13.22: Four resistors, each of resistance R, are connected to a baxe2l 5q sj;pp5ttery in the following way: “Two resistors are connected i;slx55qepjp 2 n series. This combination of two resistors is connected in parallel to a third resistor. This set of three resistors is connected in series to a fourth resistor.” What is the equivalent resistance of this arrangement of four resistors?

  95.35: The voltmeter in the accompanying circuit diagram has interoa0 e/hioh,4 bnal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA,h 4/oeiao 0bh. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. Tcne p.h1c2g y61sn u+(9jtlzx he three bulbs 1, 2, and 3 - represented as p+1 ncsl eny z2tg9.u cx1(j6hresistors in the diagram
- are identical. Which of the following statements are true?
I. Bulb 3 is brighter than bulb 1 or 2.
II. Bulb 3 has more current passing through it than bulb 1 or 2.
III. Bulb 3 has a greater voltage drop across it than bulb 1 or 2.

  99.30: Given the simple electrical circuit at the right. If the current in a(72gj;ed5 y7.mp wamozxd6k ill three resistors is equal, which of the following stat6.mi wpx7;y(2gkj eod5d 7azmements must be true?

  99.37: The diagram at right represents a simple electric circy3+e vz92z+ jnk4wzil gl, p.xuit composed of 5 identical light bulbs and 2 flashlight cells. Which bul 9zg 3kynlpe+2zz xiv.4j, +wlb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT true concerning the simple c. tc5z,-vg (g tn vnyqxn7-f0v 5o3azaircuit shown whervnz t0t -y35-v cnaox,g( 5z.qvnfa7ge resistors R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connecy4 fky0zb wy2(6i-ow m21 oorjted in series to a battery. Bulb X is brighter than bulb Y. Assume all circuit elements are ideal.yo 422yy(1jk mi0 o6zr-wfwob If bulbs X andY are connected in parallel with each other to the same battery, which one of the following choices best represents what is observed?

  06.34: How many coulombs wi-tx,- vy(fswejyhl+vr2 m2 3zll pass through the identified resistor in 5 seconds once the circuit was c es+zh-vv2x- fy jwt 3y2r,lm(losed?

  00.23: If all of the resistors in the following simple circuiy/8* 8d pxlstg+.j 5z*6x xw bvkvav/zt have the same resistance, which would dissipate the greatest power yj txg688l/* ps *v zwxbvxzk5./+vad?

  98.34: In the accompanying s) +mlsgjf3kr +;:sglcircuit diagram, the current through the 6.0 Ω resistor is 1.0 A. What is the power su j+;3ssllrsg) +g :fmkpply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected ;-(j(g 5c ozduw1izpb in series to a battery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissipates 6.0 W of power. What is the voz i1ug-5 dwp;c(zjb(oltage across R3?

  99.40: Three different resistors R1, slt4z 4+1ygh-fa74 hvcdns2q R2 andR3 are connected in parallel to a battery. Suppose R1 l1v4-td 2s fcg q+zah44hny 7shas 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is the maxij f:66 6jlpcye ny w:-tvz1ke8mum value ofcyvee-:l : yn jj66f186z pktw the current under these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designed to operatei/ ux 3by3bhqi6a2/ qd at 120 yux2db3 6q3qih/bai/ volts?

  03.09: How much curre8f. usk4- heiyp xk)0vw)n2gmnt flows through a 4 ohm resistor that is dissipating 36 watts of pfe-s2pmngk0iuv) wh y. 4 8k)xower?

  05.21: A household iron usj 6kkft/m(k/p ed to press clothes is marked "120 volt, 600 watt.” In normal use, the current in /mkf6kjkt/( pit is

  01.05: Which of the following resistances could NOT be pro lnq93zd, o--rpnqvik)t- ix +e,v6l jduced by a circuit containing rov,3e--inl)di nj lqkz x6-v +tpq9,only three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of the followi s+q:ws( ib:ui;k.7lk czb2ccng equivalent resistances CANNOT be produced using 2c:k(+sibq .kz w sbi:cu7 lc;all three resistors?

  02.06: Three resistors of different value6kt hb+o7 hiy4s can be connected together in different configurations.hitboy6 7k 4h+ If all three resistors are used in a circuit, how many different values of total resistance can be produced?

  97.35: When a single resistor is connectea v2.q fksza*8l *d)rcwf)h:rd to a battery, a total power P is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are* krfq va2frh8 *d wa)zlcs):. connected in series using the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, having resistance R1 and R2, are connected in paradrg m jhqf4dfn9 7a-nxd +*8h7llel, the equivalent resistance of the combination is 5Ω . Whin9-*afhhgrx dq 7 dmn4fj 8+d7ch of the following statements about the resistances is correct?

  02.46: A hotplate is desiad mg(7hemua79u-x mr3u 38.sko(ye ugned such that it has a resistance of 12Ω when operating at 120 volts. What is the minimum amount of to 7(er 7y.3hgaex8au9 s-uummmduk(3 ime that it would take to warm 0.45 kg of water from $15^{\circ}C$ to$85^{\circ}C$?

  03.09: How much current flows thro(: -/tkugo5isg4a sovugh a 4 ohm resistor that is dissipating 36 watts ooigu/g o-k( s vsa:t54f power?

  01.24: An electric heater draws 13 amperes of cur73 dm8pltl9zaw8t8ee rent when connected to 120 volts. If the price of electrictet788zlml p39 wde8aity is $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately how much would it cost to keep a 100W ligrwf 4gb4a 4de;,uiieyd 2fe+4htbulb lit continuously for 1 year atfi beeg+du4w yf42a ,eid4r;4 a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulxi; q3vt k99k 1m0nhldb results in a power of 24.0 W associated with the bulb. Which one of the following choices bestx 9 3mkt hnqv9l;ikd01 represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a computer rated at 500 watts in a 1 t3r7q9u t:gci20 V circuit. If all computers are plugged into a single circuit protected by a 20 ampere fuse, what is the max3tr7c9 qu:itg imum number of the computers can be operating at the sametime?

  03.16: A 9-volt battery is connected to four resist *xy4 si6itjkbinge,y/al 63;q25 hziors to form a simple circuit as shown to thst,xky/ g6 *ah6i 5qii3ilze2n4jyb; e right.
How would the current through the 2 ohm resistor compare to the current through the 4 ohm resistor?

  03.17: A 9-volt battery is connected t/o-i:odak) ayq h7e z(o four resistors to form a simple circuit as shown to the ri:zqi/(h-eoak)da o7 yght.
What would be the potential at point B with respect to point C in the above circuit?

  02.21: An ideal batt55 mtxkf4 5wqyery, an ideal ammeter, a switch and three resistors are connected as s w5 5fqyxtm45khown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes.
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, an ideal ammeter, a switch and threey4g su u,6)ol)eob1 nl resistors are connected as shown. With the switch open as shown4,)no ou es)l6u1yglb in the diagram the ammeter reads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battery, an ideal ammeter, a switch and three resistors are connf:qk*o(g t 9m6l :gofxected as sh6 : gxt(k oq:9flfg*moown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?

  12.14: For the circuit shotx9(bfs -qt)d6w1o,b l1s-q/e mllf lwn to the right, what is the equivalent resistance? Assume that all wires are ideal, the battery has no internalt lqb1t- 6mw(fqss1o-dl )fb, /9el lx resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the 3y6ayjvg*- wnk.a. zn circuit shown to the right with resistayjw6.ng-z. kay*3 navnces $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identixyp3 j /xz)f-lcal resistors connected in a combination series and parallel circuit to a voltage soux- f/3xljyz)prce.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical remdxp,w9 7 wpe 8ga:j6bsistors connected in a combination series and parallel circuit to a voltage source. 7ap mb9,gp6xjde :8ww
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of tomn4is q9i 2f9hga:l) he bulbs are identical. Which bulb will be the brightest?nf h4)2oga:99qil sm i

  02.21: An ideal battery, an ideal an:eniypx)c8z. 3 (suu mmeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammen(ps)y3.e un : x8czuiter reads 2.0 amperes.
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, an ideal d gznf2/5 x-t -1tceaxammeter, a switch and three resistors are connected as shown. With th-5xd catt2-z gxn1/fe e switch open as shown in the diagram the ammeter reads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battery, an ideal ammeter, a switch and three resistors are cg slsl.-mes 43onnected as shown. With the switch open as shown in the diagram the ammeter readsls-3seg.m ls 4 2.0 amperes.
When the switch is closed, what would be the current in the circuit?