16.09: In the circuit shown, an electric current exis ; f .rwmic r(9:k)hm-mt1xhnrts in the metal resistor con.r c-:inmk1(9hmf mwr);trhx nected 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 interior of the resistor?

  98.06: When any four resistors are connected in parallel, the__/0lvao(m ik7a7qr 0yop t+s-m _______each resistor is the sam0(7 opa-qaks o+mvt /i0yrl7me.

  06.33: A current thr9 j6glpw*k.f0wd5 o jwough the thin filament wire of a lightbulb causes the filament w6 gpdkf0w9jj5o* wl .to become white hot, while the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are being replaced with LEDs. LED is thorgm/8qvfzt0d+ s,iu25wt2e e acronym for which onw/rst 0vqe85 f2oi+,tm uz 2gde of the following choices?

  05.16: A cylindrical graphite resist xf- azwp4( :37bpdbb9t9 e2cyv jn 4z1opvxv)or 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 resistivity to the7:xcjp 14zavt4 b9b-vwd(bzfpy o 3 )x9pvne2 old resistivity of the cylindrical resistor?

  98.20: Wire I and wire II are made of the same material. Wire II has twice the d-h7cmdgd gh ,l d6++wpiameter and twice the length of I. If I has resistand++h6h d- pdm 7l,gwgcce R, II has resistance

  99.31: Wire Y is made of the same material but hbm(ju,7 o2cvr as twice the diameter and half the length of wire X. If wire X has a resistance of R then wire Y wm c,o7ujr(2vbould have a resistance of

  03.23: A cylindrical resistor hae*v(f f3i)-u wqg w0rxs length L 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 fqf )(ue-3vixrww0 *g this process?

  07.27: A junior Thomas Edison wants to make a brighter light bulb. He dec:qm.6e) lzvwf (a 7s6b mxlq)ev q-jp.ides to modify the filament. How should the filament of a lightbulb be modified in order to makesm xq w)pzm j.v a667-lvbel.e fq:)(q the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors are made of the same mate9 ds jmwxwu al1,0 yd.h1a-5gfrial. The length and radius ous0 5xy dd 9lhgj waam11w,.f-f 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 cjdlvnj 830*xlonnected to a battery in the following way: “Two resistors are connected in series. This combination of two resistors is colx*8nd j3jv0l nnected 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 internal resistav1) o7mg 6(/mxh 1vw9k cqavclnce 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is mosow7)h19 ( kv/mclcgx6vv 1maqt nearly:

  97.37: Consider the compound cin6w+k: apxozy0)(b elrcuit shown to the right. The three bulbs 1, 2, and 3 - represente :6lxb kn (peza+0y)owd 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 in 9el0eo hw h40x3a)xh os-*ss+ j6xm 3egiof 5zall three resiose30gs3z5 4 hlesh6)0xeajow*hxo 9mf i x+-stors is equal, which of the following statements must be true?

  99.37: The diagram at right represents a simple electric circuit composed odkxm eswws ;58fe 7yg t)7cl; kz+t;y:f 5 identical light bulbs and 2 flashlight tk l7f5z+7ws;xs;:y w )eye8;kmgtdccells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the followin,d d+i2gx u ez-nq5;b8+lg zi(njadr0g statements is NOT true concerning the simple circuit shown wh -d5grd+0zn8 al2dezi+ uxjg biq;(n, ere resistors R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY ars*i5 77kbnm5 epz,+ovvh izv4 e 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 o4o z*m,iv7 nvb+7v eizp 5khs5ne of the following choices best represents what is observed?

  06.34: How many coulombs will pass through the identified r4d0exlqk .nb1f;qzg 9 esistor in 5 seconds oeg. 10;bz9lq4 xqkdf nnce the circuit was closed?

  00.23: If all of the resistd-9dkp ph46ski40zy po p kp2 cd49cvwa73:vnors in the following simple circuit have the same resistance, which would dissipate the g 909a 4zhv6w :nddkd-sypcp3ppo7k ikp v4c42reatest power?

  98.34: In the accompanying circuit diagram, the current through the 6.0 Ω resi wp7a5xsp a,7igrx6i:dz ,sk9ku0c 5 jstor is 1.0 A. What is the power supply voltage V?jrs x9ipaz d 7s gx67p i,uwack55k0:,

  97.27: Three resistors R1, R2, and R3 are connecz,;)qz kfnqk zig/h9hl0ymmu0v( usp 2 : ot/4ted in series to a battery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3i:suu/4hf(kq z90p0mmgk nqhl,t2;z yo/ )vz .0Ω, and R3 dissipates 6.0 W of power. What is the voltage across R3?

  99.40: Three different resistor 9/qnr sb/f;mcncoe 3i(td 2f,ae h*i/s R1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V/ (9n,e f;nhedfai*/ qs m2rcoi t/bc3 across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil is cz5s e- h-mjv)rated 1200 watts and 120 volts. What is the maximum value of the current under these consehmvc- -5j)zditions?

  99.23: What is the resistance of a 60 watt lightbulb designed to op 43pel4l.g9 :1m2bibyhsvx-w n :yve yerate at 120 volts?.n e9w4yh3 v:ieb:4 yml sb1yvxl2gp-

  03.09: How much current fl t3lx9 jkcl- gn+.0iupows through a 4 ohm resistor that is dissipating 36 watts of pow ijpkc+l9u-xgn 0t3. ler?

  05.21: A household iron used to press clothes is marked "120 volt, 600 watt.”8:sji,tt7f-twqr ag 9 0o2c um In normal : 98art mw0 jtucgqsit-,72ofuse, the current in it is

  01.05: Which of the following resistances lyxo ip)43f-wcould NOT be produced by a circuit containing only three identical 6Ω resistof3 pw)4o ix-lyrs?

  94.37: You are given three 1.0 Ω resistors. Which of ti,bex(xx-h( b he following equivalent resistances CANNOT be p(eb ,x (xxi-hbroduced using all three resistors?

  02.06: Three resistors of different values can be no y/;huy;bry ag/o9ij-1s p3 connected together in different configurations. If all three ;ao/1 y- 39nybso puyjg /rh;iresistors are used in a circuit, how many different values of total resistance can be produced?

  97.35: When a single resistor is connectedaatp9 5q(sza9 bp;hb+zb4 3) (xnuqpt to a battery, a total power P is dissipated in the circuit. How muchq(ttsa 9x45+qpbu9(np;z h z b)3pbaa total power is dissipated in a circuit if n identical resistors are connected in series using the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, having resistance R1 00gi ee4+bccl and R2, are connected in parallel, the equivalent iceebg0l40c+ 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 resis8 ;cm80ko bvn taw1/p yvp5ct-tance of 12Ω when operating at 120 volts. What is thoc1-m /k c8vbpap 5t;0ntwvy8 e minimum amount 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 thyfmaya bxj ,am5c/j)9n*9jzp 7t84 yd at is dissipating 36 watts of pozc m),da5 x9fy*7yt a8yjb aj4/pm9njwer?

  01.24: An electric heater draws 13 sa bjcq-a: czkyd8 fk5:w; skh g6)2:eamperes of current when connected to 120 volts. If the price of electricity -:)yczk5 w jehqss:bfaa82 c:kdk6 ;gis $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately how much would it co k.o0pzrzuh pa7r .3 ;dc7z5wast to keep a 100W lightbulb lit continuously for 1 yea aop.5d 7.hw;z0crauz r3p7kzr at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lighta :tt6rf6xte/ 6can+h bulb results in a power of 24.0 W ass+h t: axcfte66n 6art/ociated with the bulb. Which one of the following choices best represents the resistance of the lightbulb?

  01.10: Each member of i8a- 7hucd1 dpa family of six owns a computer rated at 500 watts in a 120 V circuit. If all computers are p8d-ipc d 1ha7ulugged into a single circuit protected by a 20 ampere fuse, what is the maximum number of the computers can be operating at the sametime?

  03.16: A 9-volt battery is conn+by1: cp zs)cwected to four resistors to form a simple circuit as shown to th ccbw):+ps 1zye 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 conne6f (3uukpl xgh(yld(: 3fs i1y*nk7nvcted to four resistors to form a simple circuit as showd1 v(nyk u n(ypf3 (fu7ilxhk3sl*6:gn to the 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, a switch a27m;w 94 zciutr.tfk+e/wusgnd three resistors are connected as shown. With the switch open as shown in the diagrat 2w siu g+7k4cu9.;ezrmfwt/m 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 re 4cs4 bv pia-t0ou6x(vsistors are connected as svb46( o vupx-c 0stia4hown. 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, an ideal ammeter, a switch and three resiwn *;8)x purmct3f4izv) p;p ystors are connected as shown. With the switch open as shown in the diagram the ammeter rea 3) vxu;m;4t)pir*8nyzppcw fds 2.0 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 equiva)nzl r:xfkf 34 7kyxv9lent resistance? Assume that all wires are ideal, the battery has no f:)f 9x rk zy4n3xv7lkinternal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circue * 7)rvlv/d-dj hexa7it shown to the right with resistances *da-7hjvv d/r e)7elx $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors connected in a combin;m tr6m76 qvv;e 9,0o7rdyac d*vujloation series ac;; 076vm96,u7 d qo* yrlr ojatvvdmend parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resisq/ 4knbg c5-ch6iia o6tors connected in a combination6/6q gc-h 5 a4ckboiin series and parallel circuit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit d6o(n2b dz ye7ulg. ,roc))t2fi 9fl(loxwn2fiagram, all of the bulbs are identical. Which bulb will be the brcx6olz l2fbe y2(f ).9 ,ndlu)io ofntwr7(g2ightest?

  02.21: An ideal battery, an ideal ammeteju,a yww-;l(kt60sh3(luj pw r, a switch and three resistors are connected as shown. With the switch open aswukl y,w- ;au3(0ws6p jt(jhl 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 resistors are conjjq 90 wrlsy2it; dtt23,r7+y yi tmm)nected as shown. With the switch open as shown in the diagram the ammetewr7ijjy) s3t q i0m+ t2 ;mtr2ly9,tydr reads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battery, an im k1-y393+isidafsue deal ammeter, a switch and three resistors are connected as shown. With the switch open as shown39se-idkm iy+3as uf1 in the diagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?