16.09: In the circuit sh- hrurzy1o xd-w-*:k/ ,lcg wyown, an electric current exists in the metal resistor connected 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 z rlhry1c/:-owxu-k d*w y,g -resistor?

  98.06: When any four resistors are connected - aenw0 pm.n2qin parallel, the_________each resis02a.qne wm -nptor is the same.

  06.33: A current through the thin filament wire o *r3*gf.mkc0dz5gtzs -;oyk1g5pq y wf a lightbulb causes the filament to become white hot, while the larger wires connected to the lightbulb remain much cooler. This happens*. w5tk*0q-m5 zkpgr;g sdyfcgo1y z3 because

  13.08: Some standard household lights are being replaced with LEDs.8:jkqcudg o k91 hcd2+ LED is the acron+uo c2 k:gc8kjq9 dd1hym for which one of the following choices?

  05.16: A cylindrical graphite resisu)b 0fp c*me cvhu;c(2tor 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 th p0cc)em uvb(fcu*;2 he 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 material. Wire II has twice thct;r qb(k9(p j(2qdq he diameter and twice the length of I. If I has resistance R, II hasr2(dq9j(pq b(;khctq resistance

  99.31: Wire Y is made of the 0abe51ub zk:hih 7+w lsame material but has twice the diameter and half the length of wire X. If wire X has a resiueblkb0hziwa1 + :5h7 stance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L andfm:7dn9i z8d cej)uf w9sqk*8k99e oz radius r. This piece of material is then drawn so that it is a cylinder with new l :kcz89qmj kfw9en f e7i9) *d9zs8uodength 2L. What happens to the resistance of this material because of this process?

  07.27: A junior Thomas Edison wants to make a brighter lig5e kddbg*pjten21 m87ht bulb. He decides to modify the fi2p8d7bmgde*5 ne1t jklament. How should 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 o(:)wa:dn o4o w;hpbj p.ysa*d f the same material. The length and radius of each resistorj.4 wy::osdwpba a(p ;d)o*n h 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, p llo50) wr:tdn+ k)l15 muj7/t yzumbare connected 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 resistors0lmb)jt 1k:/m z d7)wuou55rl+ tnpy l is connected in series to a fourth resistor.” What is the equivalent resistance of this arrangement of four resistors?

  95.35: The voltmeter r( aeg318jg nxin the accompanying circuit diagram has internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is most n(re g8n1 xg3ajearly:

  97.37: Consider the compound circuit shown to the righq7m; +5prt ew p:stk(ht. The three bulbs 1, 2, and 3 - represented as resistors in the dia t;(ppqmtewrsk7+ h5: gram
- 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 7-4a sd 2kt-c+ad glhtat the right. If the current in all three resistors is equal, which of the- - l7ttdg2d+sackah4 following statements must be true?

  99.37: The diagram at right represents a simple electric cir z0;euokl r 6f2dnv+c+cuit composed of 5 identical light bulbs and 2 fl nvl2 oz6edf +ur+k;0cashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT true concers ja/gmufb3, qbe/2r9ning the simple circuit shown where resistors R1,ja/e93/bsqg mbfr ,2u R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in ser6cdrvr:7+ vjqms h-i2ies to a battery. Bulb X is brighter than bulb Y. Assume all circuit elements are ideal. If bulbs X andY are connecs mr7qv:d rj+civ2-6hted in parallel with each other to the same battery, which one of the following choices best represents what is observed?

  06.34: How many coulomfyo.eug3.sytev7(q4 m;pj a 8 bs will pass through the identified resistor in 5 seconds once the ci.pa.ute 8y3 4yofm (;evjg7 sqrcuit was closed?

  00.23: If all of the resistors in the follow0m )n( /x6jtbg qdp e)gz)po*ding simple circuit have the same resistance, which wpm )j q0)pog6dt)bne *z/g x(dould dissipate the greatest power?

  98.34: In the accompanyingw9cev.g5tg r5 circuit diagram, the current through the 6.0 Ω resistor is 1.0 A. What is tv5grgec 9 tw.5he power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected in series te1 e9bzqie*x( 8vfq c2o a battery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissizfe*c(bv9 1e2 qxq 8eipates 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 bac;4.pz i+p f5h ah4waittery. Suppose R1 ha5 fw+zh;.i 4paip4chas 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil is rated 12e p /rb4u+cl)r00 watts and 120 volts. What is the maximum value of the crr+u ep/l b)4current under these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designeat127 nd7bbwzn2rsl3mg. l6o d to operate at 120 volts31d mzwb2ll nr 7.sgnt b7a26o?

  03.09: How much current flows through a 4 ohm resistor that05hf*t)g; (q6yq 4xflyv neyx is dissipating 36 watts ;qqy6vlfe )(g4n f*x5ythx0 yof power?

  05.21: A household iron used i8y1g8k;r wmb,fc b; vto press clothes is marked "120 volt, 600 watt.” In rk g8;bi ;8 fcwybm1,vnormal use, the current in it is

  01.05: Which of the following resistanmocd(jdbqpnv9 n e;5 64poa:)e- rc;tces could NOT be produced by a circuit containinc 9a )q c rodnpetoej;p5vb;dm4:-(6ng only three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resisto5 lr ll e9,pmokc.i2v p4p9qo6rs. Which of the following equivalent resistances CANNOT be produllce kpvlp. ,2o9mpi o4r96 5qced using all three resistors?

  02.06: Three resistors of different values can be conuc+-z uwn6,y wnected together in different configurations. If all three res wc+wnuu,y z-6istors are used 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 mx;62 l nb3 lrhp0hd1jpower P is dissipated in the circuit. How much total poweldmr6bnplx 1 ;2hj0h3r 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 resir.1n h 1f(9h v/(qnx xwzo7wuzstors, having resistance R1 and R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following statemxfw (nzqxo.9vz 7rh h(1u 1nw/ents about the resistances is correct?

  02.46: A hotplate is designed such that it has a resistance of 12Ω w42 )e + l9 jx+devzqpul2xpbvm4(4awwhen operating at 120 volts. What is the minimum amount of time that it would takeawumd 4 2 vj94lvx2ebzl)4 pwp(+x+eq to warm 0.45 kg of water from $15^{\circ}C$ to$85^{\circ}C$?

  03.09: How much current flows th;xkuep x oi/1ety6p2 2rough a 4 ohm resistor that is dissipating 36 watts of pow ex1/6 u2pi2;pxkyeot er?

  01.24: An electric heater draws 13 amperes of current when connected to 120 ,joiou/kzjc po8da c-7h g4*6 volts. If the price of electricity7 ziuopoaohkg -6j 4dc,cj*/8 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 chju. :x jf:ki4c/h+l+jgfi*oontinuously for* h/hx4ij:j+j ogul. k+ic:f f 1 year at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results inx8se*jg.w. z j a power of 24.0 W associated with the bulb. Which one of the following *zx.g8j ej.swchoices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a computer rated at 500 m*eg r*sny4g* z)amzmgzv-,w 9gw a/:watts in a 120 V circuit. If all computers are plugged into a single circuit protect)/ *es :gr,gngm9 -4azga**vww ymzmzed 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 simpljs7 puuq mlsb8 1xyu9q4i/- 2me circuit as shown to the92/b mij mqsus7x1y4-u u8qlp 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 n;tkj . xa23,otrv0 mwsimple circuit as shkwjrt3,; vta nox.0m2 own to the right.
What would be the potential at point B with respect to point C in the above circuit?

  02.21: An ideal battegce:wg*j+ *po ry, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter oggjew**+cp: reads 2.0 amperes.
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, ayf .7r pql jgk55xl-l,,ay*thn ideal ammeter, a switch and three resistors are connected as shown. With the switch open as showpy *k- jrqg.5lal ,5ly7,fxhtn 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 resistors /z+u 0: 7onuizotlaw+ are connected as shown. With the swito ++lz:ouna0uw/z 7i 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?

  12.14: For the circuu b, x.ancc.wv j*a cye+6j:q9it shown to the right, what is the equivalent resistance? Assume that all wires are ideal, the battery has no internal resistance, and all three resij:a jqynxw+cc. vb, c*9eu.a 6stors have identical resistance R.

  09.07: The equivalent resistance of the circuit shown 7n;n ec 7qichouyq45q.i63pm 4(led o to the right with resistc4qi;7(qqln.6p 43mcuiy7deno o5eh ances $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows vs*kk/lj,q4xv le:n :five identical resistors connected in a combination s,llq/ s :j*v4e k:nkvxeries 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 5lpuev(s ,8.b ojrwbcwy4 ig,k +p,au93u+xfin a combination series and parallel circ8x 9aw pu( jgefri4u+,.c+bb ,kp,wuyvs5o3 luit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of 0,anyl,n; nkj le5jw.the bulbs are identical. Which bulb willlln,. ;5yjn,0 kneajw be the brightest?

  02.21: An ideal battery, an ideal ammeter, a switch anm:b ,-clvl+ofd three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes.v:l+bml cf, o-
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, an id0h7h mr2 n3vpoeal ammeter, a switch and three resistors are connected o2vn rh7hm03pas 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 battery, an 70ueosjt41 t cideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 am ts0jte14cu o7peres.
When the switch is closed, what would be the current in the circuit?