16.09: In the circuit shown, an electric current exists in the metal ryih.90 q(rksnesistor connected to the battery. Which one of the following choices best des9nsqirk0( yh. cribes 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 arv(2u6a 7t4htb o q3c.idpf+v le connected in parallel, the_________each resistor is the same4qd to if .valhb(6tvu2 +7c3p.

  06.33: A current through the thixvqx ) 5gm)va:n filament wire of a lightbulb causes the filament to become white hot, w xmq))vx v5a:ghile the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are being sf 7jfg7-l xmxswx/3li,c; x5u g3qd(replaced with LEDs. LED is the acronym for which oxxiu,wgqsg jxcsll x(;7 df 3/75f m-3ne of the following choices?

  05.16: A cylindrical graphite resistor: ajh fj3g0ij3 has length L and cross-sectional area A. It is to be placed a3j:ijhf03jg 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 resistivity of the cylindrical resistor?

  98.20: Wire I and wire II are made of the same mabwsi2m.e0*xpc* y6 naterial. Wire II has twice the diameter and twice the length of I. If I has resistance R,a *2c*.n6x mbw0p ysie II has resistance

  99.31: Wire Y is made of the same material but has twice the diameter and ha*ntnu /v*e47xi9rxok j ry)q ;lf the length of wire X. If wire X has a resistance of R then wire Y would have a resistance*exu /n inv q4* rrj);k9yo7tx of

  03.23: A cylindrical resistor has length.6es )om +rull 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 oe6.m+u) l oslrf this material because of this process?

  07.27: A junior Thomas Edison wants to hqzi 4js* 3-1 gqyme/zmake a brighter light bulb. He decides to modify the filament. How m*s3 jz ye1qq/g-4hizshould the filament of a lightbulb be modified in order to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors are made of the same material. The length iq,39 jlcou jm,4z, sanordn:7 weu 29and radius of 9q:ln,,c mrs7w de9a ,ozuijn4 ouj23 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 re oxu1+nx2 so5v21 d(rw:qvzclsistance R, are connected to a battery in the following way: “Two resistors are connected in 5xu:zq w2sdn+x r(v1l2ov o1c 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 disg +u )qy1t p.:+8yh;gb:z ;tg tl;mxdwsr, fzagram has internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. Thz zx1s b)wtf:tgqg8:grs; ,;mh;yt ++plydu. e ammeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the db*3peo s wmz 0lvqj);ju.9s+ 9od d9tright. The three bulbs 1, 2, and 3 - repr d.wto mls09vszp* + b9jo3q;d9u)j edesented 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 sim0gaww qkbtk3 ;0k.sozzu -3 vich2+;iple electrical circuit at the right. If the current in all three re ;vsc. 02bqu wgao3;0i+z3h-wtkzk kisistors is equal, which of the following statements must be true?

  99.37: The diagram at right represents a simple electen*w; m -d3qedric circuit composed of 5 identical light bulbs and 2 flas3*e;qwd e-m ndhlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the folloo vo9ooigj-+z g *;/ k yj. f)pmrigy5d:zrx*0wing statements is NOT true concerning the simple circuit shown where resistors /*;r:5g i oiyyo-0 rg9m)kj j zxpdvzfo.go+*R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a battery. Bulb prcc 9jw /+afz e7b65iX is brighter than bulbp/b59f6 w +j cr7iacze 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 observed?

  06.34: How many coulbly+5ba/ v 8vcsmz lb4dylow 9:ja9*-ombs will pass through the identified resistor in 5 seconds once the circuit w v:sdz/c myjy* 49av a-w+ll8bb5lb9oas closed?

  00.23: If all of the resistors in the following sh 2phb/x.s/5o5pxsz1k.cia -p p-v pfimple circuit have the same resistance, which would dissipateb-pk 5 /iosh zx52fhp p/pv.c-a .1sxp the greatest power?

  98.34: In the accompanying circuit diagram, the current through the 6.0 Ω r3kbg4pv.r i +desistor is 1.0 A. What is tg pd+b 4r3ik.vhe power supply voltage V?

  97.27: Three resistors R1, R2, and R3 arebt diovn 2o:aaa)1,/ j connected in series to a battery. Suppose R1 carries a current oaovd1 oab:t 2n )/,jaif 2.0 A, R2 has 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 connected in parallel to a batkqsjj /6qk* . l-bqxkfnj7j,,tery. Suppose R1 hasjjkxqb , q7*j,.sl-/fqn6k jk 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil *7ybiqpcf13r st/cj 1 is rated 1200 watts and 120 volts. What is the maximum value of the current under/jp3i1c71sf*ryqbc t these conditions?

  99.23: What is the resistance of a 60 watt lightbulb des nwwzz7.rw, t+ .m30liyade.pigned to operate at 120 volts?t.ead 0 ilz.pmwr n,3z+y.w7w

  03.09: How much current flows through a 4 ohm resis1aoa7j-gc 5lltor that is dissipating 36 watts5 l1-o7aagj cl of power?

  05.21: A household iron used to press clothes is marked "120 volt, 600 watt.” z e1v ioaq;e47fjxv7.qom 7q0( )b ojx1 op4rqIn normal use, the current in itjqv7or1q o 1e74bjq ;vq)o efpx .maz0oi x7(4 is

  01.05: Which of the following reocnb*62 omj:.i* kjudsistances could NOT be produced by a circuit containing only three identical 6Ω rc6.*m * oju: bkd2joinesistors?

  94.37: You are given three 1.0 Ω resistors. Which of the following equivalent ub9:kgrl.* w oresistances CANNOT be produced usk.u: 9*lgbw roing all three resistors?

  02.06: Three resistorsa;/1jf 5ub 1 r9)php xv3cscgt of different values can be connected together in different configurations. If all three reu3/)p5c1g;t s1arh9jpxfcbv sistors are used in a circuit, how many different values of total resistance can be produced?

  97.35: When a single resistor is tlm45q3h-n vh azvv5*connected 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 connected in series using the same battery? Assume the internal resistance of the batt *nqvh tvazv- 4h55m3lery is zero.

  96.16: When two resistors, having resistance R1 and R2, cumyt(m l+g ph+akk3he-h(4 9are connected in parallel, the equivalent resistance of thet+u pg(mkaeh(3m-lh y4k+9 ch combination is 5Ω . Which of the following statements about the resistances is correct?

  02.46: A hotplate is designed 7lpb 4lwr ud8vog ;,r8such that it has a resistance of 12Ω when operating at 120 volts. What is the minimum amount ofpor b4l uv,7lg8r;dw8 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 dissipatinxmr5b *ze26h.qp6ii9. pxo;bbi9ab(mr 4s r z g 36 watts of p; e6bmsba rzqbrii(ix6rhom.54b z*p9x9p. 2ower?

  01.24: An electric heater draws 13 k4)e*x:btv0 fm 4zakm amperes of current when connected to 120 volts. If the 4x0kzm m e)av:kb tf4*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 be- h/bgw2r2f would it cost to keep a 100W lightbulb lit continuously for 1 year at a rate orfbh w/egb-2 2f $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb resw*r a283hi5:o vujwyrer kt 9(u2 rr9sults in a power of 24.0 W associated with the bulb. Which one of the following choices best represents the reaukw8w*orhj3v:52( 29u rri9 rr syet sistance of the lightbulb?

  01.10: Each member of a family of six owns a computer rate4ig(-g *m z7x)v .aqetmlh3vkd at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protected g)3 h*m.la q t gvvkei-z7x(4mby 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 circuitd v:)l *zdp)xt ad)l tz)p dx*v:s shown 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 is connected to four resistors to form a simple circuil sfy9)cbno t 89m-g(a7:t frgt as o 9nc8gaf7b9)rf yt( tsgml:- shown 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 ide4)(6hn -t yvw (zkjtkyal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes. wn(4tvy h6k tjk(z-)y
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, an idwx: jix/q +f)y-ydkoa;sm2)0a 6 rchw eal ammeter, a switch and three resistors are connected as shown. With the switch open as shown ina)sx +o6/ y2jwq-f raciwk)myd;x:h 0 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 ancld52o.o bsq cq .85:zc9 klcnd three resistors are connected as shown. With the switch op8c9:lc2s 5nzl5co ..koqc d qben 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 86cwnfj met r+ze:)c( shown to the right, what is the equivalent resistance? Assume that all wires are ideal, the battery has no internal resisn(8 we+rt 6fzj)ec: mctance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuc bb7 k:z.f e7ins8a.a(b.xo /:as ixpit shown to the right with resista i:bz :ab s8pbfx.k7e(.7xia anocs./nces $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors connected in a combi09.i)3k nttxkjolttg + yk5r0nation series and parallott 9ji3rly0kk gkntx0.5)t+el circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five idacy 15*lj0a ytentical resistors connected in a combination series and parallel circuit to a voltage source.jc10yty*5a al
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circu m*vt f0eshm; .-rms,0ujhkj,5( grosit diagram, all of the bulbs are identical. Which bulb will vfjgko(um s, stseh;m,0h j5*-rr.0 m be the brightest?

  02.21: An ideal battery, an idet:tn h5ilgb4 ;al ammeter, a switch and three resistors are connected as shown. With the sih5 ;ttn b:l4gwitch 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 three r cztia+62ltf3 esistors are connectilctf t36 2+azed as shown. 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 batt elnm,b6o bg.6pa r.g-ery, an ideal ammeter, a switch and three resistors are connected as shown.6 l.mo,gr bbga6.e-np 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?