16.09: In the circuit shown, an electric curgioqq+ ff;1cb. :c5:po zte /zrent exists in the metal resistor connected ;c/ :.z+ef o:gzcbtoq pq5fi1to 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 interior of the resistor?

  98.06: When any four resistors are connected in r:y6r9lax chnib v(,)parallel, the_________each resistor i6lybac)rv 9(n ,hx: irs the same.

  06.33: A current through the thin filament wire of a lightbulb causes the fila+rh;o h4 l)f4a kqgbmr05p(evyo,p w: ment to become white hot, while the larger wires connected to the lightbulb remainvhoppgb0f,k(ylw4 )5 mer+rah oq; :4 much cooler. This happens because

  13.08: Some standard ho +n u:v78 5lhe8dg,os.acuegbusehold lights are being replaced with LEDs. LED is the acronym for which one of the folloc 8.h:7loegub 85 sue ,vgdan+wing choices?

  05.16: A cylindrical graphite resistor has7l d j08cz) un6rtss ;6ygnun. 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 tu8nu6n0)r j.ty l 6zgdssc7;nhe new length is 1/2 L. What 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 o +ushm .k6/txthe same material. Wire II has twice the diameter and twice the length ot.kmuo hxs6/ +f I. If I has resistance R, II has resistance

  99.31: Wire Y is made of the same material but has twimu ca) ()r7s9ych3xtbysmcq ) ux: fz ;iwk*(9ce the diameter and half the length of wire X. If wire X has a resistance u:*)(khmmw 7 qy9i9xbtsrf 3)xac ) sy;uzc(cof R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and radius rv3ptn w k(.q6y. This piece of material is then drawn so that it is a cylinder with new length 2L. What happens to the resistance of this materialnvqktypw6. 3( because of this process?

  07.27: A junior Thomas Edison wants to make a brighter lightv u )0m+3e76 d58 nrxqz yrs2qxm)nidh bulb. He decides to modify the filament. How should the filament of a lightbulb be modified in order to make the lightbulb produce more light at a given voltage? 2ure05)q 6 dh)yrmd8nizsxmnv +7xq3

  16.07: Three cylindrical resistoo0cve 2 w-: 9fgazlt.brs are made of the same material. The length and radius of eacvgtzof: 9.-2ew0 bac lh 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 battery t+i-tllseq:f p+d-o2in the following way: “Two resistors are connected in 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 fooq+sdf-- e pil tlt2:+ur resistors?

  95.35: The voltmeter in the accompanying circuit diagram heehk px,,ny 7,as internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammey ,h,pknxee,7 ter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound cirsigd z:))r-sh t 3ku+d.x rp*tcuit shown to the right. The three bulbs 1, 2, and 3 - represented as resistors in thetr) g*-r:).hsup tsikd+3dzx 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 tdg6 fqut 48vng89*r+wz pr/kghe right. If the current in all three resistors is equal wr9qvn* tk 8 +g6g4ugdzpf8/r, which of the following statements must be true?

  99.37: The diagram at right represents( 3bfh hqmt +0gn 9.cdb;pd5ep a simple electric circuit composed of 5 identical light bulbs and 2 flashlight d0.9t hmc3;+5 (qnpf hpb egbdcells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the 0l1945vml 0g8 cuzx7crll ovdfollowing statements is NOT true concerning the simple circuit shown where resistors R1, R2 and R3 are have equal resistancesx0g z rv7vc9ld ulol104mlc58 ?

  17.29: Two lightbulbs X anf,b vv+e(6i jjdY are connected in series to a battery. Bulb X is brighter than bulb Y. Assume all circuit elements are ideal. 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 observ,j(+ fijvbe v6ed?

  06.34: How many coulombs will pass th03dar3nt6y j6 dm 5yemrough the identified resistor in 5 seconds once the circuitmeadj65t n336dy my0r was closed?

  00.23: If all of the resistorajfit2qr07 b2x:fy m+ s in the following simple circuit have the same resistance, which would :2q7xjry2b+ aff mti0dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the current through the 6.rn e:+;rr 11 t+oawhhs0 Ω resistor is 1.0 A. Wrr+r h ah;:+wo1 st1enhat is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are concqhq1*x+:bu8px( xd1ma 7t t wnected in series to a battery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissi1: + 8(w1acxux7ptqbtqdm x h*pates 6.0 W of power. What is the voltage across R3?

  99.40: Three differenp nwsw/4ccq ,-fme0 s9t resistors R1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in 4fqsw -,sewp0cn/cm 9 R3?

  99.13: A heating coil is rated 1200 watl zzeqwfk+e7yq 1,/ 5lts and 120 volts. What is the maximum value of the current under these co wk57, /zl+fe1qeql yznditions?

  99.23: What is the resistance of a 60 watt lightbulb designed to op;2l b y9/t)w:)m wfthzdxa60xalbtw4erate at 120 voltsh26ab wlyd f)z04/;l wx9wmt:) axtt b?

  03.09: How much current flows through a 4 ohm resz04f* 6p al7 rk5qylwnistor that is dissipating 36 watts of powernqzw*fpay6rk4l7l5 0 ?

  05.21: A household iron used to press clothes is marked "120 volt, l7 e52clx q8lj600 watt.” In normal use, the current q 287le5xlcjl in it is

  01.05: Which of the following resistances could NOT be producedbfw8iqr92;gqw 7c n.p by a circuit containing onlywn7qicrg; p 9qw82.fb three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of the folitq.op6b 6 a+,gb5u1miec +hq lowing equivalent resistances CANNOT be prod,1qmhq5iu6ai+6e. gcp +b bto uced using all three resistors?

  02.06: Three resistors yo+cdxl m2w1(usp5 t i ; 7m1+l n/nhd9kuz)iaof different values can be connected together in different configurations. If all three resistors are used in a circuit, how many different values of total resistani79 +pz udu2nt/)aw(5o m k1xyi1chn;dmll+ sce can be produced?

  97.35: When a single resistor is connected to a battery, a total power P j+x* :3wj d ds/xsjot,is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are connected in series using the sdxd: ,sjx3t /osw+* jjame battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, having resistance R1 4s ,4tf*s :b.amose f2ec3efcand R2, are connected in parallel, the equb442 e* sesao sc mef.,ftf3c:ivalent resistance of the combination is 5Ω . Which of the following statements about the resistances is correct?

  02.46: A hotplate is designed such that it has a resf *thd6 1hkqp)8s a0esistance of 12Ω when operating at 120 volts. What is the minimum amtqpd )sf a806seh1 k*hount of time 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 through a 4 ohm resistor that is dissipating 36 w ls wgb f8i6gg .;cvs7sp-z: czo1m68uka,5mgatts of power?.z6wo:mv- 8pzs5g6 8kmsgif7 , csalg;bu gc1

  01.24: An electric heater draws 13 ampe)1f/1y - cz.rg bmzb2to5jo iares of current when connected to 120 volts. If the price of fim52z- 1/ toobc.y1 z b)grjaelectricity 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 lightbulb lit contir5s;rx4. e*xy2tff 2t oy0fu onuously f.rfy ufo2s0 2efyxtr*tx;4o5or 1 year at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results in*h o 19,cxhivn4 je:pk a power of 24.0 W associated with the bulb. Which one of the follo h:jec *4o1kni h9v,pxwing choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a computer rated at 500 wattsry;d3-kqul02kd f9jaf 0ouz6 in a 120 V circuit. If all computers are plugged into a single circuit protected by a 20 auk- 2 ud96yra0f3 fq0;kzjod lmpere fuse, what is the maximum number of the computers can be operating at the sametime?

  03.16: A 9-volt battery is connected to 9a,klgl d46u l uz/ez+r:d c)f(n-a fhfour resistors to form a simple circuit as shown to the rn)kf9fa6g:l(a4zd url - e+ul,zdc/ hight.
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 connectedu w,-p( 6iobgb to four resistors to form a simple circuit as shown to tu-bibgo pw,(6he right.
What would be the potential at point B with respect to point C in the above circuit?

  02.21: An ideal battery, an ideal ammeter, a780at3c/h n7 mt fpzzg switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter read/cn78hmz p 3 aft0z7tgs 2.0 amperes.
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, anjvlt** .svdd)b e 0wx/ ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter readsbsldx )j *./vvedw* t0 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battery, an ideal ammeswoa9 v :dj(:w4u(qndter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 4ws(jaowv:q9 nd( :ud2.0 amperes.
When the switch is closed, what would be the current in the circuit?

  12.14: For the circuit shown to the right, what is the eq xhqgy3)ycclg5yo 53:uivalent resistance? Assume that all wires are ideal, the battery ha3gxl) :y55y cohq ycg3s no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance ok +od u;)ln(ewd2w 55z.qwl rff+jss;f the circuit shown to the right with resist;f(jw;slu5 z os n5le+.f2+kqrd)w wdances $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resi 5s)-mbe h586cwhatbvstors connected in a combination series and parallel circuit to a voltage so5sb68 chb w5e)mavh t-urce.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resistors connected in a combinu gr )wz(g25a7yukc +u8,xgd rt9h*8lci1wgnation series and parallel cir l guy9 zrwi+u u*k57n,a2c g h)8wdxt8gc(1grcuit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diag:lzin;g :raoyqx* /9fram, all of the bulbs are identical. Which bulb will be the brightesx o:q/* ng:azrfy 9il;t?

  02.21: An ideal battery, an ideal ammeter, a s -f6ycwiba;a:witch and three resistors are connected as shown. With the switch open as wb6;iy- a:afc 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 three resisj yijw2m2ts 4f(go) h)tors are connected as shown. With the switch open as shown in the diagram the ammete 2h2jwf gjo)(mi 4)ystr 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 andm5/hu8,/+ b:oys9bdjisrgap three resistors are connected as shown. With the swi:som8by/5 gjbrus/ p,dhi9a+tch 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?