16.09: In the circuit shown, an electric current exists in the metal lhksu:xb(8j 59z,mz 2u(,z7gzzwqk r resistor connected to the battery. Which one of the following choices best describes the direction of electron flow throqjr:lkw 859x 2uzzbzzh(z 7,(u k, gmsugh the resistor and the direction of the electric field through the interior of the resistor?

  98.06: When any four resistors are connehge/ne,t38qy g lz ;pfkkv9 9:cted in parallel, the_________each resistor is the ty :qekfhle9/nk ;9gp,3 gv8 zsame.

  06.33: A current through the thin filaj;sc- vuln)d /ment wire of a lightbulb causes the filament to become white hot, while the larger wires connected to the lightbulb remain u l)jd-vs/nc; much cooler. This happens because

  13.08: Some standard household lights are being replaced with LEDs. LED is t 33c1mtne zdt.yk6: ga 22vztshe acronym for which one of the following choices?23k1z t:dv3 yce6g.tzn2samt

  05.16: A cylindrical graphi*bplt szog*flq7jgb9- i6 19bte resistor has length L and cross-sectional area A. It is to be placed into a circuit, but it -bboi97*q6fbg g1p*l9t sz ljfirst 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 material. Wire II; bu3j 9voy4b/ mmvxszy+ 8+rf has twice the diameter and twice the length of I. If I has y zo4/mbuvfryms+9 ;3jxbv8+ resistance R, II has resistance

  99.31: Wire Y is made of the 7 -dwlua wds((same material but has twice the diameter and half the length of wire X. If wire X has a resistance of R then wire Y wsu7 awwl(dd-( ould have a resistance of

  03.23: A cylindrical + alc6/xk,mu,t/ub*q.wzyxph ug + x3resistor 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 because of this pzxmxy .wx, a q3t,u+h*b+uu l gc/6p/krocess?

  07.27: A junior Thomas Edison want1kud6* dg cj-o3y+vyf9/wnsrs to make a brighter light bulb. He decides to modify the filament. How should the fila* gkjw9 ds361ruy- fv/y+ cdonment 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 oe ml/u3t /3smsame material. The length and radius of each resistorloms3//t eu3 m 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 connected to a battery zuh mvn y82. vor+o//jin the following way: “Two resistors are connected in series. This combination of two resistors o.ovmv82r /j+/ uhynz 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 diagram has internal resisg841dnx o8h(uv2j lmp tance 10.0 kW and the ammeter has internal resistance 22n1dgu m8p 8v(o xj4lh5.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the comd8zg.1z jf-4b*qxld/fi )rc+ w smt.fpound circuit shown to the right. The three bulbs 1, 2, and 3 - represfxd- t zzjql wb..r*idm4s 8/)g+f1fcented 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 curr8 hklsls0dav uf/d.oqj e* 622ent in all three resistors is d /jlk*lo.2q2f eu 0sah6ds8vequal, which of the following statements must be true?

  99.37: The diagram at right represents a simple electric circuit composed ofbn* y 1fg)x4iv 5 identicav b1xn4 f)iy*gl light bulbs and 2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following stafbkd,./cjsm4cbrs5db5;e i ;z5ys m2tements is NOT true concerning the simple circuit shown where resistors R1, R2 and R3 are have embs s d;fys52/j .bdm55c zke ,;4bcriqual resistances?

  17.29: Two lightbulbs X andY are connected in series to a battery. Bulb X is briicunc3.d ;pupw0 .c/jghter 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 0n ;ucdpiucp../ j3cwthe following choices best represents what is observed?

  06.34: How many coulombs will pass through the idyls/ont;f 2 :fentified resistor in :lo n;f2tfys/5 seconds once the circuit was closed?

  00.23: If all of the resistors in the)h i0o3i jqq( p.awyvp o56ps iq)3wg0 following simple circuit have the same resistance, which wpv.)sq) 0wqa gi3 3 y6owpi(o0ji qh5pould dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the current through the 6.0 Ω reirp;0jvkvj 8 ,imr or./r s43jsistor is 1.0 A. What mjkorp;v3vi4j,r.r/ j i08r sis the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected in series to a batter,, ;f b4ktnp*/bl9zpugib-de y. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R ; ,fzpbpnl/e tg*k-,b9bi4d u3 dissipates 6.0 W of power. What is the voltage across R3?

  99.40: Three different resistors R1, R2 andR3 are connected i;wsvd av8t9 v6n3gr a+dzi;y.q ltmp*/;vjc 0n parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipatepma /ldaq.vr g;i8jdy*t s; 0w936 tcnv+;zvvs 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts6-pojkl ij:r, and 120 volts. What is the maximum value of the current -,6riopjkl:junder these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designed twwhkuj 36vo0o1;v8u m;h k7cqo operate at 120 volkuh7 o c0h;v8j 13w wuoqmkv;6ts?

  03.09: How much current flows through a 4 ohm resistor tp3.mrl *es +u 6 zlhetkkt2/9rhat is dissipating 36 wa lp3 rh6 lt2k */eze.m+s9turktts of power?

  05.21: A household iron used to p1x0s - m,zsqczp4fp/y /y+mkfress clothes is marked "120 volt, 600 watt.” In normal use, th k mz-/ 0/14+x,pc pzsyfmyfsqe current in it is

  01.05: Which of the fo bqaj jow8)p*5gq 6;qvllowing resistances could NOT be produced by a circuit containing only tqovqg; 5 jpa) *qj86wbhree identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. 36mivc+; z* ntimsh d;Which of the following equivalent resistances CANNOT be produced using am*zmvs6i ;+d; icn t3hll three resistors?

  02.06: Three resistors of dl 1/t)ihi x+rxifferent values can be connected together in different configu/ ir+xi)x thl1rations. If all three resistors 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 powe u+ 54(pc4i1zxsdlrjty rt )+dr P is dissipated in the circuit. How much total power is dissipated in a circuit if n idel4+j 4ri ysd5du c)tp1z(txr+ntical resistors are connected in series using the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistor (6:6x -il0qwut stdxts, having resistance R1 and R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following statements about ( t tsl0ixxuq:twd-66 the resistances is correct?

  02.46: A hotplate is designed such that it has a resistance of 12Ω whe:b*vht z n-os(n operating at 120 volts. What is the minimum amount of time that it would take to warm 0.45 kg of watehons btz :-(*vr from $15^{\circ}C$ to$85^{\circ}C$?

  03.09: How much current flows thro*f2qu;jh-xzfy8e: y zugh a 4 ohm resistor that is dissipating 36 watts:fx-eyuqf2j*zz ; hy 8 of power?

  01.24: An electric heater draws 13 amperes of current when connected to 1rt9+-x 2lvclb20 volts. If the price of electricity ibc l+9l2vt x-rs $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately how much woul;8uehr(6oli q-c mlc2) 6wakrd it cost to keep a 100W lightbulb lit continuously for 1 year at a -2hml8iw k6aqu6 )eo(r ;clcrrate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb resl9f 1l8r ;j0d3b dxvkv9nnbr0ults in a power of 24.0 W a lr3lnvdjdk9 ;b9rvxbf810n0ssociated with the bulb. Which one of the following choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a computer ratzqa 2e0s2ro uy7bt/ y73emjc1ed at 500 watts in a 120 V circuit. If all computers are plugged in20o7c3je1as7t2y qeyz r mu /bto 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 t1iw2qqcdogkg-z-v8) o four resistors to form a simple circuit as shown to- 28g ziq)owdgcv1q-k 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 ccjjg2:awofh*mk.7e x 2*add. emx21g ircuit as shown to the righ22j.7hgxwxok*adf1aec me* : gd2mj.t.
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 resisrw2mpq z1:y*ky/23)kyn jum3 x9zgdptors are connected as shown. With the switch opmrmp9u 1y*z/ 23: 2wkjgzpyyqdk) 3x nen 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 resistore7cdg,ca -v .(xqfz;ns are connected as shown. With the switch open d-(fc. gzn,v ec;a7xq 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 xm6.ifq/u/ mu switch and three resistors are connected as shown. With the switch open as shown in the diagram m. u f/6qmiux/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, what is the equivalent resistanc e61*bvkj7z ke85b obbe? Assume that all wires are ideal, the batterbkvobje *z 1bb8 k5e76y has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circ wlp .prrwik2n7x:60kt.gkr:y 9ro +guit shown to the right with resistannr y9:wxpk 7tgw.:2kp0kg. rir l 6or+ces $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five idend l.yyzm5*/dgmi:t xsz+:jd 2tical resistors connected in a combination seriesglxjy*z.:m5yd+ 2/:zmidst d and parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five idevahoy h,4b-: bntical resistors connected in a combination series and parallel circuit to a o-,:hvyhbb4 a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all ofzv sru9hmg4o;,; kv( otpnjyp4/avxbz1f 63. the bulbs are identical. Which bulb willnx(t69.aub4 31pp4/,zvmj ; zsohrvy ;gvok f be the brightest?

  02.21: An ideal battery, an ideal ammeteri fdjdor)5x645pdf h /5e q)ny, a switch and three resistors are connected as shown. With the 6ojqxde5dfy d4f5)nhip)5 r/ 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 swil(j,w q hglxl c y10q0z i;msost01p;.tch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter rg(zox l;syiw m10;0jq s.pq,hc1l0lteads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battlnuenj pa .r/cccerj73g42.z ;is+cw*)s .uzery, an ideal ammeter, a switch and three resistors are connect;a.szr+ j24uiu wn *rpj)e/gc.zce l3.c7 ncsed as shown. 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?