16.09: In the circuit shown, an electric current exists in the metal resistor ckmhpa::2hmh 4 onnected 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 rehaph2mk:4:h msistor?

  98.06: When any four resistors are connected in parallel, the_________each .bqarn( am //pb ;t-0 8j4gmt(jjlvkiresistor is the sameip ./vjgt(b -m8ktmlb;j 0a4arnq/( j.

  06.33: A current through the thin filament wire of a lightbulb causes the filam +vcp27knq /uwent to become white hot, while the large/p vk+wnuq7 2cr wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are being k w)k,d0ifs w7replaced with LEDs. LED is the acronym for which one of the fok0w)i7kf dsw ,llowing choices?

  05.16: A cylindrical graphite resistor has len4a/juax ba8cdc/o+xw8y9b (m( ojmvq /qs5 o3gth 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 the old ubyao8a+a xxs 3 (q 5jcd/ocq/9w84vmmjo/ b(resistivity of the cylindrical resistor?

  98.20: Wire I and wire II are made of the sameev4-2 o1bsj1owylkx 3 material. Wire II has twice the diameter and twice the length of I2ksjloob3-1e yw41xv . If I has resistance R, II has resistance

  99.31: Wire Y is made of the sa4s 4k,vsx*pa gybrgr7h2, qc2:v1lnwme material but has twice the diameter and half the length of wire X. If ww gvxn1 ,, sl*vhqag2r kb2c7 :y4sp4rire X has a resistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L.aqt gh1+pv 801wuvk r and radius r. This piece of material is then 0gqwp.1trka8 h 1 vuv+drawn so that it 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 brighter light bul7q me2t;(a t/h8b/ebbnsh a(db. He decides to modify the filament. How should the filament of a lightbulb be modified in order to make the lightbulb produceb ne h;hda/sm /b(8att(eq72 b more light at a given voltage?

  16.07: Three cylindrical resistors are ma3lhsl aypxm9uvp ; -)-de of the same material. The length and py9-lmhvsa -)l pxu3 ;radius 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 o3,zdqduv0rjr;1 zq.k a2 hmr5z1. dne f*ovl- f resistance R, are connected to a battery in the following way: “Two resistors are connected in series. This combination of two resistors is connected in udra0*1zlj,dz. f1dvro -;z2qk3.hvqe rm5nparallel 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 internb p.fgufj3w:sis 6 ;)qal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter readin.q;j s)gf3u piwf b:6sg is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. The three bu )3kc1z7cs4 - :ud:jlnjzvtik lbs 1, 2, and 3 - represented as resistors in the dik1 v:tz:jcj-k3uzsd lic)4n7agram
- 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 currxch cg5s f99-um3xe; zw1kd .qent in all three resistors is equal, which of the following statements must be trcz- 5;mqgfh1. sdue9cx3xkw 9ue?

  99.37: The diagram at right represents a simple.5 hgxeeb86h ht+-gwkyo9un9 electric circuit composed of 5 identical light bulbs and 2 flashlight cells. Which oht5+w uh hyng.86ge9b9-k ex bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT true concerning the simple circuy c+v 7a4jg9ctit shown where resistors R1, R2 and R3 are g+4yctv acj 79have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a battery. Bulb X is bri0 v94 *yu3ahyr2pmn, ;2twjh sp;czzzghter 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 *n w;vhhzz9 z,sruc p2pmjt4y a;23y0the following choices best represents what is observed?

  06.34: How many coulombsngx)pfqg) 0o6 will pass through the identified resistor in 5 seconds once the circuitn0gp g6)f xo)q was closed?

  00.23: If all of the resistors in thejc72d v8oak6hlz7n, l following simple circuit have the sl o2vz7ajh7ldn8 k,6came resistance, which would dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the * etlz(b40yqd current through the 6.0 Ω resistor is 1.0 A. What is the powez(b 0ld4etq *yr supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected in series to a battery. S/qjqyyzy (x mjcgx *7tz(/t 59uppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissipatyq x(xmtj97y*j/ y 5g(/qcztzes 6.0 W of power. What is the voltage across R3?

  99.40: Three different resistors R1, R2 as86p ripb2i,ym82bee ndR3 are connected in parallel to a battery. Suppose R1 has 2V8mebi2p28e6bps y , ri 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 mapts 2,6:l-sg1bkb ji mximum value of the current under these conditionss pb:2,jbm tg6-1 klis?

  99.23: What is the resistance of a 60 watt lightbulb designed to opera6d ot *e(+n* klnd.a. vpjehj*te at 120 volts na6+* p dvjnelt .edhoj.(*k*?

  03.09: How much current flows through audh0 )rl/hmau6k1b+emo q,: mf)wa;t 4 ohm resistor that is dissipating 36 wattsqah ) ub)l:km0t/ ;hro mmu1waed f,+6 of power?

  05.21: A household iron usedl g m+w ;b1:7 5l+m0vvkuhu0xoiugi l- to press clothes is marked "120 volt, 600 watt.” In normal use, the curr-hu10uv :+ 5k;+mlbvox0ul7gi iwml gent in it is

  01.05: Which of the following resistances could NOT be produced by a cirrioz3y gps.o5 +/uzyn;,2 rxxcuit containin2rx.ip/s3 no5 z;gxz y,yoru+g only three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resizoryh ay /bi2ilq0 5x9c1: c/tstors. Which of the following equivalent resistances CANNOT be produced usr9ix/atzhlc21y0 c :o5b/i qying all three resistors?

  02.06: Three resistors of different values can be connhwy968pp q. ,qhf wabb)t:s6:kx hxo7ected together in different configurations. If all three resistors are usek6 oq haxs8:pbw).79wt,hbp :yhx qf6d in a circuit, how many different values of total resistance can be produced?

  97.35: When a single resistor is connected to a battery, a total rhvzt( e2 t 7823najbwpower P is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are connected in series using thv(b 2 7z8rejt ahwtn23e same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, havi.p,6byp ch3vj ng resistance R1 and R2, are connected in parallel, the equivalent resistpjbv 3cyp, h.6ance 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 r4v+u2a0a pzs a resistance of 12Ω when operating at 120 volts. What is the minimum amount of time that it would take tov4r2su aaz0 p+ 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 diss9ql8ns y+ kw+uipating 36 watts of pn9wu+yk+ q8ls ower?

  01.24: An electric heater draws 13 amperes of current when connected tyvbhxi/8 ko*4c e( p,jo 120 volts.vh/,b 48c*kip (y joxe If the price 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 lightbulb*s,pzls 9jv 8vt /1oz0cji(s l lit continuously for 1 year at a rai8s0j o9 ( l/l,spjvs v1*tzzcte of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a ligh*dmb9zgw .cb 6u +quy9tbulb results in a power of 24.0 W associated with the bulb. Whwuc*6bqzu9 mby9 .g+ dich one of the following choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six ownsd txwevb/h +0.0cscc- a computer rated at 500 watts in a 120 V circuit. If all computers are plugged0tcv.w+/ 0scdehb c-x 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 connected to four resistors to form a simple circ1/j -tvsijm(za(u4 ecuit as shown to the rig/- mvc 4tzjjus (eia(1ht.
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 ijs/*pnpk+;o3t db+x. -zk tdconnected to four resistors to form a simple circuit as shozt os3*iptk-x kd/;bd+.pn +jwn 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 and three resistors are colf 0c4ku5ff+j5k- sjzbsf; .onnected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 ak skfl +o5ff.u0czs54f; b jj-mperes.
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, an ideal ammeter, a switchf m*gy zm1* /l.6ny(5eep ijb )mqjd8v and three resistors are connected as shown. Witn*y8y zmj g(i qpd eb)*em1fv5m/.lj 6h 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 swiksaamu+x ow fb.w3-y7w -bs*: tch and three resistors are connected as shown. With the switch oa.7 kxw*b: 3wwuosb-a+s- f mypen 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 shown to the right, j,q9fm ud)ms /5i uhc;8v-tnv ws-5g uwhat is the equivalent resistance? Assume that all wires a8nc5- qd sg )v tw-5/siuvuuhm;9f m,jre ideal, the battery has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit shown to the sg* yd9utf6cu9le9envw4id (5 ,(gqm right with resistances(yq(e9 ,gtlf 995nsvg*m w64eiuddcu $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram be6 13e nmirjpt :u)g1ntlow shows five identical resistors connected in a combination series and eti u n3t:6pr1mgn)j1 parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below show* zy b*c/txg, dzq/b3b2xxx,o s five identical resistors connected in a combination series yzob bg *tq, *3/bcxx ,/xzxd2and parallel circuit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs are identical. h(-l)s87xsdjok / + e7avtdj pWhich bulb will jto7+(/s 7 )pdalevsh j8 -dkxbe the brightest?

  02.21: An ideal battery, an ideal ammeter, w 2 nc: aw;(d2)ay6wnlygnt+z-ea .jza switch and three resistors are connected as sn(:wn. azn t2;6a)y-jly+e adgczw2w hown. 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 a( ;lf,8gd w5h05ei lq kb7zvtbnd three resistors are connected as shown. With thki8d05 ;w(z,5bt7hfqe l lgv be 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 batte t3st9r6c6(s j9a 0zy jktr4eqry, an ideal ammeter, a switch and three resistors are connected as shown. With the switch orc963tq 4rjys at 9js60z(k tepen as shown in the diagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?