16.09: In the circuit shown, an electric current exists*bh4ekc 54 jsy in the metal resistor connected to the battery. Which one of the following choices best describes the direction of electron fk5hbjc 4 e*4sylow through the resistor and the direction of the electric field through the interior of the resistor?

  98.06: When any four rmv ibyu4 +s,gv)z*ev:esistors are connected in parallel, the_________each resistor is the same )u s4,:g vbzyvme+vi*.

  06.33: A current through the thin fil6g*p v v7jd.gfn*+ l4pctb(w gament wire of a lightbulb causes the filament to become white hot, while the larger wires connected+*(g.gg7 4j pw 6vpvnf*ltc bd to the lightbulb remain much cooler. This happens because

  13.08: Some standard househwylyl9fm d- ;3old lights are being replaced with LEDs. LED is the acronym for which one wdfym9yl- 3 ;lof the following choices?

  05.16: A cylindrical graphite rek-vjvhbvcbh9s*k, a;cqj0o+ wt2 w 84sistor 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. What is the ratio of the new resi*;oc b, jk2vvh9 k 0v wqsa4cbtjh-8w+stivity to the old resistivity of the cylindrical resistor?

  98.20: Wire I and wire II are made of the same materialp :o y;g;*lkc 4td 1*yv8hrsel. Wire II has twice the diameter and twice the length of I. If I has resistance Reyr1vh;k4d t:lpg8s*c;ol *y, II has resistance

  99.31: Wire Y is made of the same material but has twice the diametervcahq7w,i: 2a and half the length of wire X. If wire X has a resistance of R then wire Y would wv:a2i q7cha,have a resistance of

  03.23: A cylindrical resistor has length L and nua,0yb*j 5jtradius r. This piece of material is then drawn so that ijab uy j5*tn,0t is a cylinder with new length 2L. What happens to the resistance of this material because of this process?

  07.27: A junior Thomas Edison wants to make a bright;zwfw m*t9om2er light bulb. He decides to modify the filament. How should the filament of a lightbulb ow*2tfm;m9 w zbe modified in order to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors are mabk1c1ue.h 8 vmde of the same material. The length and radius of eahk ce8.m1bv 1uch 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 con;e xp2wy+kr*szs./ ; kor 3ugjnected to a battery in 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 equivalent2es+s ;pz r j3 r/og.yuk*;wxk resistance of this arrangement of four resistors?

  95.35: The voltmeter in th5b*dqk8f;d,zcee*h e e accompanying circuit diagram has internal resistance 10.0 kW and the ammeter hab, 8k5 dq*ezcf;ehed* s internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. The three bulbsg,2lb( szga .vdg87 zl 1, 2, a 2baz s.v(ld zgl,7gg8nd 3 - represented as resistors 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:oo*d46z-:* ll lfnihyil1kz in all t *lnyfz:o*614zl-o ildl kih: hree resistors is equal, which of the following statements must be true?

  99.37: The diagram at ri0s;h klyx2:h :frm+d5m )rz ykght represents a simple electric circuit composed of 5 identicak s0 m:mdzrh:5)h ykl2x;y+f rl light bulbs and 2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT true concernb f.(xsfsb8-fing the simple circuit shown where resistors R(ff s8bb.s -xf1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a battery. Bulb X is bn d03*vl 0gmmz3xco*umt;m 7yrighter than bulb Y. Assume all circuit elements are ideal. If bulbs X andY are connected ivd ;m7motc0lu03g 3znym x*m *n parallel with each other to the same battery, which one of the following choices best represents what is observed?

  06.34: How many coulombs will pass through the identified resisto vtpnq: ug/el 0/nwr+4r in 5 seconds enlv n p/u4/:wtq+r0 g once the circuit was closed?

  00.23: If all of the resistors in the following w 5p1 mm1pb/ha simple circuit have the same resistance, whi5p phm/b11a mwch would dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the current thro+ fei7det..9f uu7yxh ugh the 6.0 Ω resistor is 1.0 A. What is the poweref.xf e.uhiyt9u 7 +d7 supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected ;0(ht 3wn nqp)o1 lbprin series to a battery. Suppose R1 carries a current of 2.0 A, R2 )bph lw 1q(n0or3; ntphas a resistance of 3.0Ω, and R3 dissipates 6.0 W of power. What is the voltage across R3?

  99.40: Three different resistors R1, R2 andR3 are conw+lu 3e o3/ip0q2; jex+ret ginected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in jeew+xtq3 l2ep3/+io i; 0urg R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is the maxs6bvg) b)y2bumzl::rocz/9n mh.hu8imum vzl/m.s)m byhczg9)bh bu :8v:6nro 2ualue of the current under these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designed to operate at *.sw.:h mh85 htcu qrze, hufymc50h;120 vo *.r tm hh8qhfc5;u5h:zyhme w0u .c,slts?

  03.09: How much current cmq* ,*rxbn;xflows through a 4 ohm resistor that is dissipating 36 watts of p, rq*xc;*bxn mower?

  05.21: A household iron usedb.g hfkb41r.j5/b5i om7 zplo to press clothes is marked "120 volt, 600 watt.” In normal use, the current in it bzob/. .f l5p5 hgr ijk1o7b4mis

  01.05: Which of the following redrip.g6sba . bc0;ggg()f 6kesistances could NOT be produced by a circuit containing onlbdpbg6iga g.e; (f)r .60skg cy three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of 24 9yma0d9d rkk8ajj kthe following equivalent resistances CANNOT be produced kj9dk a948yr da 2mkj0using all three resistors?

  02.06: Three resistors of differen)j;80wp vva);gmdc mg rig.:r t values can be connected together in different configurations. If all three resistors are used in a circuit, how many difrrc;0g v ai;pw : 8dmmg.g))vjferent values of total resistance can be produced?

  97.35: When a single resistor is connected to w)j:ese * 4:8-b 2tahgglnp pva battery, a total power P is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are connected in series usigwep vel4gj:bt8:s ha n- )2p*ng the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, having resistance R1 m )(fgxj,:mtc and R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following sftc ,g)( jx:mmtatements about the resistances is correct?

  02.46: A hotplate is designed such that it has a resistance of 12Ω when opera4m,6jihd 4wyp ting at 120 volts. What is the minimum amount of time that it would take to warm h,piy6 m d44wj0.45 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 wabviw,o . xb+.*.fyqx mtts of poym iox,w q.b. *+.fvbxwer?

  01.24: An electric heater draws 13 amperes of c hg+;ni/qm s.axg6oct( uo )c5urrent when connected to 120 volts. If the po)u( moc;/+ i qh5s6.tc ngxagrice of electricity 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 lightbuxrb7.yk2ced +gj (9xjg 7 v*qklb lit continuously forj2*qx9vc r edg( +7 jbg.kxy7k 1 year at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbgyq por)y squ 1ml-;o vj,x59gx9sd:(ulb results in a power of 24.0 W associated with the bulb. Which one of the fo5lyqru 9gdxjsg9,: vp 1s-o) yx;(omq llowing choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a compu-7hkx52yep hu ter rated at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protected by a 20 ampere fuse, what is the maxp 5kh-2u y7xheimum number of the computers can be operating at the sametime?

  03.16: A 9-volt battery isnfxt+8y/0gv ji2z is4 connected to four resistors to form a simple circuit as s/4z 08 xis vy+gn2tifjhown to the 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*7x hj5h rmvy5 is connected to four resistors to form a simple circuit as shown to the v r*7hjhm 5yx5right.
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, a switch and thrxq 8nh8z,w .tkee resistors are connnt8zxk hq. 8,wected as shown. 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 thret2 de; 7bhvreoy8a-a3e resistors are connected as s ;he8vte- a b23ao7dryhown. With the 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, mg* vi,*, p4sd z qhm-a;lix7han ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the amm;,zgm4vi 7hdp*m s*a-x ,hi qleter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?

  12.14: For the circuit sh.1a3qgj.f 3 egyng691yn yn yzown to the right, what is the equivalent resistance? Assume that all wires are ideal, the battery has no inty .9gnynyagzf13 1 egn3jq.y 6ernal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of8(( wbebk: yr2 a4:enrmw kg7f the circuit shown to the right with resistances erebk(4 g7: wb8rya w2mkf(: n$R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows fu8r1 *hdrsr d.dd aziz9x* g 97bju5p:ive identical resistors connected in a combination sr9hbud z1z8rsgp .95u *d7*jrxa:idderies and parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resistors connected in a combinat-u ))(6bfm.b uv + wurl:dj i0t4gfoscion series and parallel circuit to ruic-bjusu(:fw m)g. b+ lf0d46to) v a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs are i 1(bc fau7jz .p:yr;dqdentical. Which bulb (. dapyuzcf1bq;:j7r will be the brightest?

  02.21: An ideal battery, an ideal ammeter, ay hnx*e.87n2tm anxe0d bc(n( switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 ex7 ca2emtxn y (d n8(.hbnn*0amperes.
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 and7th 7q9j xi *6okvp1uq three resistors are connected as shown. With the switch open as shown in the diagram the ammu7kp jxt 9q 1vh6q*7ioeter 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 conncqtt2r487a xqoqb :4 cected as shown. With the switch open as shown in the di4cb7o8txr2tqq: aqc4 agram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?