16.09: In the circuit shown, an3ww j)vjo.mdspg(uy h4r74i1 electric current exists in the metal resistor connected to the battery. Which one of theds(pv)74juowyg mi hj 4.3 1rw 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 parall-:2 c o-3 ef*cdk63sc .tqfu u4zlstbsel, the_________each resistor is the same so t3cqu-f6b:2tc-3ze*4s lkcdus .f.

  06.33: A current through the thin filament wire of a lightbulb causes the fm+xw :qvgu 93+o;k je(+jwidwilament to become white hot, while the larger wires connectjv++93dewgw;ukowim(j x q: +ed to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lightl k /6c-ayg5w)b)ad b 61htavms are being replaced with LEDs. LED is the acronym for whv-ad c) 5/m)wyaba6t1 6b lgkhich one of the following choices?

  05.16: A cylindrical graphite resistor has length Lt4iol)yw(9(zo6 lfmhy-jbz + 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 resistiyy 4h)+ 9bjl6l mowf zz(i(ot-vity of the cylindrical resistor?

  98.20: Wire I and wire II are made g(lb oe0hn2w6 :qka8 k6geg34w k,zjtof the same material. Wire II has twice the diameter and twice the length of I. If I has re e3wk kgeg(nb zat,w:6lhk 6 2jo08gq4sistance R, II has resistance

  99.31: Wire Y is made of the same material but has twice the diamec8i3qscg7 ;h hfqd42 tter and half the length of wire X. If wire X has a resistance of R the384qd shtf;ic gc7qh 2n wire Y would have a resistance of

  03.23: A cylindrical resistor has le-ol-kvu1j(i5d*x8q)u c qamo0/w du j6ukwo6 ngth L and radius r. This piece of material is then drawn so that i-8l/ ijdk1u6qja (cud)om* - 6quuwk5owx0v ot is a cylinder with new length 2L. What happens to the resistance of this material because of this process?

  07.27: A junior Thomas Ed.gk w vda v.n-04abumf,qx( 3kison wants to make a brighter light bulb. He decides to modify th3..ba xuan-kvd, v wkf4q0(mge filament. 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 cylindricalait.7-b y3 fa1mdhy(u resistors are made of the same material. The length and radius of each resistor is:- 7 fyadh. 3b(i1ymaut
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,kf)ob da1s5-z each of resistance R, are connected to a battery in the following way: “Two resistors are connected in series. This combination of two reskz b1o-ds5f )aistors 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 accompf*xjyj hgs8.j3w-x p6 anying circuit diagram has internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The amm68 p.-ghfxjx 3*swy jjeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. The three bulbpi3 y xc kw*n6z)*m,nls 1, 2, and 3 - represented as res n ciy)*n*kmxp,36zlw istors 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 current in all;29ctg5 fnchb three resistors is equal, which of the following statements must be c gf52n ctbh9;true?

  99.37: The diagram at right represents a simple electrf+su*(vr gy kz 1w3d(dic circuit composed of 5 identical light bulbs and *+zy1(3(u d fvgks rwd2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the followindb g3vh5k9 fa l3629/tmh4ius um ku8ig statements is NOT true concerning the simple circuit shown where resistors R1, R2 and u3 ua9hl i 84u v3msdti6/52kmhgf9kbR3 are have equal resistances?

  17.29: Two lightbulbs X andt, p hhag4zf q,k4k.it.1: zhx mx; t7lbn/6rjY are connected in series to a battery. Bulb X is brighter 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 the follow r1,xj lkzpg4a.;.x6f:itnzhk7/q,m bht h4 ting choices best represents what is observed?

  06.34: How many coulombs will pass through the idw te1 3ovtt-j*9lh8gtentified resistor in 5 seconds once the circuit was close3eo89 lt wvhttt -g1*jd?

  00.23: If all of the resisrtx:t:f w /he 5bm1lpf3+bh)x tors in the following simple circuit have the same resistance, which would dissipate the greatest powefx wbtfth5h ):x:m+1elb/pr3 r?

  98.34: In the accompanying circuit diagram, t,wd eubs;0 -zhhe current through the 6.0 Ω resistor is 1.0 A. What is-e;0 d bzh,wus the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 arebz uu2q4iw*;,vw *yi9 jl;cpc connected in series to a battery. Suppose R1 carries a current zpyc wj9l*4uuvbwi*;;2i q,c of 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 -po(ns l1gm9e eq;*o fR1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current s( ;*e9ogqeo1pl -nfmin R3?

  99.13: A heating coil is rated 1200 watts and 120 vk1:th ny0cruhh m-)n2olts. What is the maximum value of the current unt):n k uyhr2hm1 -c0nhder these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designed to operate acrr h-n,*0 ussm; +mlo2/n arxt 120 vol ;or-ra0 sxnum/2 n*lh+src,mts?

  03.09: How much current flows thkvkh-o0 wpf0g7e;+igrough a 4 ohm resistor that is dissipating 36 watts ok-ke p;v7 ggfo 0whi+0f power?

  05.21: A household iron used to press clothes is marw,xxt:(xb,v vy 0)5ughkb x3cked "120 volt, 600 watt.” In normal use, the curren yx, )xb5ctkv 0u(:,bv3xxhgwt in it is

  01.05: Which of the follojhby 824oz ;qsp)sdr 1wing resistances could NOT be produced by a circuit containing only three identical 6s j qdsz1p;y8rhb2)o4Ω resistors?

  94.37: You are given three 1.0 Ω resiswy.e+6(f.:o cx eg instors. Which of the following equivalent resistances CANNOT be produced using all three re ieg+(yen:.w o. x6fscsistors?

  02.06: Three resistors of different values can be connected to):sus5yh qwt uw59 +nogether in different configurations. If all three resistors are used in a circuit, uws s55 )q+w9ny: hutohow many different values of total resistance can be produced?

  97.35: When a single resistor is connected to a battery, a tot+hy-n o 4zh+ttal 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 by++noth hz- t4attery is zero.

  96.16: When two resisrxf(;gu/t w 8 x9 4vztah73ezmtors, having resistance R1 and R2, are connected in parallel, t( urzzt9 ;7x/hf4awe38v xmg the equivalent resistance 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 a resistance of 12Ω when ouy v60yp(y aj1perating at 120 volts. j0p1u avy6yy( What is the minimum amount of 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;z(vp5 7i r)g-dhuht9 i5ckye ohm resistor that is dissipating 36 wattupr5y h;-v9eh7cdti(z g)i5k s of power?

  01.24: An electric heater draws 13 amperes of current when connected to j+ p.w30bl dg2 j; il 1ahk-sic1xld4e120 volt;ixk j gjbiw1sl 43 20+pchl .dl1dae-s. 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.3 7h.-*e fis lovs9ds ihg*ka cost to keep a 100W lightbulb lit continuously for 1 year at a rate*oa.k .e i37hvisg*-sl9sdh f of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results in a powen1) 4 :ozluvyx9gqx2,ume -ih :ju0g cr of 24.0 W associated with the bulb. Which one of the following choicesm0: gulixh:9)- ecxjgqu v4zo,2u 1ny best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a computer rated at 500 watts inutcj 15k* :hcuwhu a*b *4v0mn a 120 V circuit. If all computers are plugged into a single circuit protected by a 20 ampere fuse, what is t cv0* hu:mu4nw5jc*k*hab1 uthe maximum number of the computers can be operating at the sametime?

  03.16: A 9-volt battery is connected to;zpl h a2fn36j four resistors to form a simple circuit as shown z h;l 32pafjn6to 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 resiw39m7:;o1 8c :fnmhozr8g gwc gou a7jstors to form a simple circuit a rf;cu:jg1 c7:9 n38agzwmo oho8g7wms 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 ideal ammeter,-wkz no2;dtyo*h /q7i a switch and three resistors are connected as shown. With the switch open as shown in the diagram thtn dh; -2wz7/ ko*qoyie 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 resisto4 jdan.q :y:qfrs are connected as shown. With the switch open as shown in the diagram then: .yq4jq:adf 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 :l1img :o,u.d z vanp--je ;wpceyb+u* u /xn/and three resistors are connected as shown. With the switch open as shown in the di/+axn dm,u -cgey/ wzpvul1.ije-n:: u po*b;agram 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 t0wca0:3 ;5wi waab gcthe equivalent resistance? Assume that all wires awa5tg0cw 3 a;cbw a:0ire 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 right withc0 dgs wam.c/;za;a7 s resistaaa scs.z0acdm7 wg ;;/nces $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors -4ds6cnchx*. mo1jjzconnected in a combination series and parallel circuit tonzj-hm4 1 6x.odccsj* a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below sho+yf n+1;.o li-3qyaid nd zxw7ws five identical resistors connected in a combination series and parallel circuit to a volonn+1i f7-wzd3yiq+ dyxal;.tage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs are identic-h6d87(e cqvn+ qyygdal. Which bulb wiqy7h-y qe8(v dc6d+gn ll be the brightest?

  02.21: An ideal battery, an ideal ammeter, a switch and threeh1xav gg94iaxj . .1dw resistors are connected as shown. With the switch open a h. gix.4dxaw jvg191as 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 arn-y l;g w3/domv(jivru 34cc 6e connected as shown. With34ly j 6om-;(/3wuivcg r vdcn 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 switch /kg-* juji jnon.3y v1and three resistors are connected as shown. With the switch open as shown in the diagram the am -. *jg3vjuo/kniyj1 nmeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?