16.09: In the circuit shown, an electric current exists in the metal resistor co4yf8uodn jp 5* *igg7annected to jogi f*7a ngd 8upy*45the 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______su/;d(pd ro (r8 o7yow___each resistor is the syd o8r7p ;(wud/s o(orame.

  06.33: A current through the thin filam6i5zl ntjr9zj1+c ,dhent wire of a lightbulb causes the filament to become white hot, whiltjlrhz6id, j n91+ c5ze the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household zcxoq 6ya/nyz3 mwa vx9-wp5:5f-xl3lights are being replaced with LEDs. LED is the acronym for which one of the following chc 3y53mazwn-xlozvq6ax- 9 fpy/xw: 5oices?

  05.16: A cylindrical graphite resistor has length L and cross-sectional jy k lbme4/0(0df5pbw 9f u/paarea A. It is to be placed into a circui(04eb5k/wfaju/l bdf0 pp9y m t, 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 ahw0o+u 78a0 +vfxu5+qvas drire made of the same material. Wire II has twice the diameter and twice the length of I. If I has resistahua +dsu0i7+0x 8 vfqw+5 rovance R, II has resistance

  99.31: Wire Y is made of the same material but has twieesdc3(1m: uj1*jitk wnf7 g*ce the diameter and half the length of wire X. If wire X has a resistance of R the 3jjkn *us(ed*i1tmceg17wf: n wire Y would have a resistance of

  03.23: A cylindrical rc-. ad7fag-xn esistor has 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 becaxd -gn a.ac-7fuse of this process?

  07.27: A junior Thomas Edim ;79 g (ge.0 hf0qlteiq(yrwpjh*v1sson wants to make a brighter light bulb. He decides to modify the filament. How should the filament of a lightbulb be modified in orrhsq .p0;*jw(g 1 gqlvh(y0tmie9 e7fder to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors are made of the same material. The length an2,n1h6 dkkw hfd radius of each resistor i1dw6h2kh fkn ,s:
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 connected to zx7mvfyenz.j; 3 t1wmt e8 75ra 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;.j13 vm wzrfexnt77 5z ymt8e 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 circuigrk)+)1 cfu jmz0 be 0xiz2r1wt diagram has internal resistance 10.0 kW and the ammeter has internal resistaczb w1g1+r2u fe0x0 )kmrzji)nce 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 thre6qg -w n(zodd,e bulbs 1, 2, and 3 - represented as resistors in the diagw6,dn- oz(gq dram
- 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.rgqkqij (f*dwnb:6;g hh*06 s If the current in all three resistors is equal, whib :q r(*g6wknh6 ;0fdgsqi*hjch of the following statements must be true?

  99.37: The diagram at right represents a simple electric circuit cktbo87-8lm3xj 9 runzig ;;mk omposed of 5 identical light8ozm 9;;mrkiutg38l 7 -njxb k bulbs and 2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the foxkr8h *ndt(l,pgl2s2l r4 ga7llowing statements is NOT true concerning the simple circuit shown where resistors lrtr 4 xs,g7ld*h 2n8a(gl 2kpR1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in se )o7e6cr+hh4 ayi fc+qries to a battery. Bulb X is brighter than bulb Y. Assume all circuit elements are idech4 7r +6coy)hafi+q eal. 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 coulombs will pass through the siqiu8z 3629w s+y1 onav4nojidentified resistor in 5 seconds onc i641snvi 8n9oq +s3jz2 aoyuwe the circuit was closed?

  00.23: If all of the resistors in the following simple c lq naaup818(lircuit have the same resistp 18lnu8 aq(alance, which would dissipate the greatest power?

  98.34: In the accompanying circuit diagra2m, .j 3ic(unhqc lh+wm, the current through the 6.0 Ω resistor ic3 .2cqjh im+nlh,uw(s 1.0 A. What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are ce+b(swctnf: 9 mpt)f8onnected in series to a battery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissipates 6.0 W of power. W)9:8+mft pts b fne(wchat is the voltage across R3?

  99.40: Three different resistors R1, R2 andjtb2r6q 7r;i,esio f,R3 are connected in parallel to a battery. Supposese27joi;f, 6,qr bitr R1 has 2V 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 voidxs1 3u:e+fizf9.l)ip8xd jlts. What is the maximum value of the current u1 d9 i lzfisup:exxd.+3if) 8jnder these conditions?

  99.23: What is the resistance of a 60 we. )m(x0t0q gg t/teceatt lightbulb designed to operate at 120 voltsgete(t x/ .gm ect)q00?

  03.09: How much current flows through a 4 ohm resistor that is distzoeeegd0r2 us aj/ k*.t(2;dsipating 36 watts of 0u kz2srtj;det*go/ aed (2 e.power?

  05.21: A household iron usckta3+. smn.yed to press clothes is marked "120 volt, 600 watt.” In normal use, the current in it k+3t. ynsc m.ais

  01.05: Which of the following resistances coulzs3yca* l,0tc d NOT be produced by a circuit containi0 y sc,z*a3lctng only three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of9*q7hjdtq y+mjsxa(do 8 vk5 6 the following equivalent resistances CANNOT be produced using a ajv5 yjkd+8 (m xoq6q*7htsd9ll three resistors?

  02.06: Three resistors of different values can be connected together inzgt 5i xzxjp,*fj8,o4 different configurations. If all three resistors are used in a circuit, how many different values of total resistance can be produf5izpj,zt 4 ,8g*jxxo ced?

  97.35: When a single resistor is connected to a battery, a total powe)ot,a xmp(vs 5r P is dissipated in the circuit. How)xs t5vop, ma( 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 battery is zero.

  96.16: When two resistors, having resistancela :23*5slzhvs tsur2 7bx*na/h6c;brwtl 0t R1 and R2, are connected in parallel, the equivalent resistance of the combitxch*/zllv s52 a6t ;tnwsrbaul hs72 3br *:0nation is 5Ω . Which of the following statements about the resistances is correct?

  02.46: A hotplate is designed such that it has ndpp (- qfcqxn:/vw 7.a resistance of 12Ω when operating at 120 volts. What is the minimum amount of time that it would take to warm 0.45 kg xdfq -.7:c(wvnnqp / pof water from $15^{\circ}C$ to$85^{\circ}C$?

  03.09: How much current flows through a 4 ohm resistor that is . wbr3kb/tj.rdissipating 36 watts of powe.bbtrw.j 3k/rr?

  01.24: An electric heater draws 13 amperes of current when connected sja187ktb pa: :h4 edrto 120 volts. If the price of elak1r7 h8 sejd4bt ::paectricity 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 100btc t:1(xi.f(mpctwu rfr 8(7W lightbulb lit continuously for 18iufb rwpxrfct( t( t 7.c:(m1 year at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a iwxa cd3c ++6n mvzv-6lightbulb results in a power of 24.0 W associated with the bulb. Which one of the following choices best represents the resi vwcz-+6d c3 mn6via+xstance of the lightbulb?

  01.10: Each member ofvr7i*,x/ nlyc /.gh 4qyon3y pp:jf 4v a family of six owns a computer rated at 500 watts in a 120 V circuit. If all computers are plugged intxyg/nyh/ f .*3,74 lri4npq:voyp c vjo 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 conqvkt it -fx,o1 kkj;bhl(()(anected to four resistors to form a simple circuit as shown to the f1lo(i,kq) -kahtxv( tb( k ;jright.
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 resing6h/ yslp ;d;stors to form a simple circuit lpgd y;6hn;/sas 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 idek( 9j *ojke9 hxoa*w)kal ammeter, a switch and three resistors are connected as shown.j ewxkoka(k9j ** 9ho) 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 three resistors are 8bwnt63l3 qtrcd-x gr oq96*l l/bm(l connected as shown. With the switch open as shown in the diagram the ammeter re 6ltlo b8d m3g6x tl*n(/c9rwb qql-r3ads 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 an6;9yai in0.lr*apd- a7elihwz cw51b6j9 h tre connected as shown. With the switch open as shown in the diagram the ammeter *hci19nliei-97.jzapw;w6dha6 nlbrty 0 5 areads 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 equivalent resistance? 9/j-c5 )b c1nepjwqajt m-/jczv;c*r s*p /ar Assume that all -wjcrc c/5 e-cv/zan bsp1mr**qj )pt/;aj j9wires are 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 : 3/grqr k6hon the right with resistances r r:kh3/ognq 6$R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors con/u /fr9ga,h6lw yjqg(nected in a combination series and paral/lr9fgg6(j/yw, a q hulel 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 c12 4lmkjh 2qi qk+x*voombination series and parallel circuit to a voltao1ik+hv jq2*q2k4 l xmge source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bs:x jb n1b+)iyulbs are identical. Which bulb will be the br1nj: ibybs+x)ightest?

  02.21: An ideal battery, an ideal ammeter,2;ow rp/dh)if a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammepr2dh)/f; iwoter 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 a* p2 n s(33bo.bpqbubimmeter, a switch and three resistors are connected as shown. With the switch open as shown in the diu .bsp ( q2b3bn*po3ibagram the ammeter reads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal batter7vyp n)z;lurn19a gld2pw+b 4y, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagrar9nndlwgy;v74p p2 1+labz) um the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?