16.09: In the circuit shown, an electric current e 3supmfp4eq b1p5*a raqg*+w ;xists in the metal resistor connected to the batp3wsub*4pr +ga1qme 5*f qa ;ptery. 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 fours prsoen .2b jw,ej7;+,9qw ix resistors are connected in parallel, the_________each resisto w9,or2j bnjw7es.iq,p; s +exr is the same.

  06.33: A current through the thin filament wiwjvqs :,:c0,d;udk zure of a lightbulb causes the filament to become white hot, while the larger wires connected to the lightbulb remain much cooler. This happvkz0: ,s:c,u ;d dujwqens because

  13.08: Some standard household lights are being replaced wiwb73 yqb);mgrd(+nw wth LEDs. LED is the acronym for which one3b7wmq)wb(wr y+ nd g; of the following choices?

  05.16: A cylindrical graphite resistor has length L and cross-sectional area A.5tksw af l.xnpx m6cr :9l/gts:q:)1e It is to be placed into a circuit, but it first must6s:xm.cw r:eql fpktn9a:)l/1s5 tgx 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)j w3 z,dg yg+);hn6l4npdvrl are made of the same material. Wire II has twice the diameter and twice the length of Ir3g6 ldn,w+dgvjz; h)n l4p)y. If I has resistance R, II has resistance

  99.31: Wire Y is made of the same m/x- ti7x i3h wh87s(kg+nvlglaterial but has twice the diameter and half the length of wire X. If wire X has a -7gxs/ht+(ihl8x7 wiknv 3glresistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and radius r.zt9 2w-:abxu8rofg ; f 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 r t8ff2a9 wboug:-;xzprocess?

  07.27: A junior Thomas Edison wants to make a brightpu9 bwhez: if(gn (n9-er light bulb. He decides to modify the filament. How should the filament of a lightbulb be modified in order to make the lightbulb producuiwp ge:z nh9(( b9f-ne more light at a given voltage?

  16.07: Three cylindrical reyr,jge by1fgysf wu )9+c5j8 xjp )s*)sistors are made of the same material. The length and radius of each resi,fbygy+uy xjp) fs)jr ges)1j *98w c5stor 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 in 04c+ lnai(r.s.ndrt6 * t6jut ren7nn the following way: “Two resistors are connected in series. This e s tclta0d6nuj .r 7rn4(tn.r*+nni6combination 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 )jou4 z+ fc(ixg-(at;hdj8l udiagram has internal resistance 10.0 kW and the ammete (;8t ah+4uc)u jjfz-( ixlgdor has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the comp*/l7 xjugw;(fsfpqwz1 avai+t2; g8 mound circuit shown to the right. The three bulbs 1, 2, and 3 - represen ft*87 (wvsg/ml1 xzfuajpi2qw; g;+a ted 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 lzvuh2 jih2:fqz 5(5c at the right. If the current in all three resistors5u: z5li2czj2 qh vfh( is equal, which of the following statements must be true?

  99.37: The diagram at right represents a simple edq6i5 2beir9x/axzz1 lectric circuit composed of 5 identical light bulbs azie 5qx2x d ar/6izb19nd 2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statemend rf zw61dq.:z5t5hlc ts is NOT true concerning the simple circuit shown where resisto5c5dtq. hr:f6zwzd1l rs R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a batter+v+52yhvyzmm ;6kwoi9 9l vagy. 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 following choices best represents what is obsevy9+k6wlvvo mh;ig 2m+5y z9arved?

  06.34: How many coulombs will pass through the identifiep, q672li*9syxi bgi kd resistor in 5 seconds 2b 9yipiklis6 q*x7g,once the circuit was closed?

  00.23: If all of the resisto n.md;sj;b7k m)p9kvkrs in the following simple circuit have the same resi ;dp9nbjkm7;s)kk .v mstance, which would dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the current through thew5a9 c evl9 4jeln43ru 6.0 Ω resistor is 1.0 A. What is the power s ur9evjw n34ca9l4l5eupply voltage V?

  97.27: Three resistors R1, R2, and Rpzsz :. zw/0ys3 are connected in series to a battery. Suppose R1 carries a current of 2.0 A, R2ps .z0zw /szy: 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 t 7;,rnd h-.l2967 w vw1ymiphgep ruqjo a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is thl6.pm h9-71dq;ngyi27e rpj rwh v,uw e current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What i-d cyzpm8w (f7s the maximum value of the curref 7y(dczmw8 -pnt under these conditions?

  99.23: What is the resistance of a 60 watt q6lcj 0w*egh:gg mp**j +fz nt 1s1v,blightbulb designed to operate at 120 voltshcws zg*v:ljp *gg6t e1,bq0n*fmj +1 ?

  03.09: How much current flows through a 4 ohm resi 9 h+ j:dn/.y j1tpcxcm4qbz-gstor that is dissipating 36 watts d-/t m1yjqnj c94hzp xbc.g:+ of power?

  05.21: A household iron used to presi:q5s mj+svht;1h *j6 fdu6ag s clothes is marked "120 volt, 600 watt.” In normal1u t* 5+s6q6;fsi:hjghmadv j use, the current in it is

  01.05: Which of the following resistances could NOT be prod.t/ m4lqi muh/uced by a circuit containin4 htu/m qmi/l.g only three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of the following equij:-x lc:zr zz+p3jo3wpm ,er,valent resistances CAN e rxc3+mj,zojlz3w-pr::p,z NOT be produced using all three resistors?

  02.06: Three resistors of different values can be connecti,2** g/ dm:as,mg1ws muqalaed together in different configurations. If all three resistors are used in a circuit, how many differew a* /sglm*u,:gd1 ima2ms ,qant values of total resistance can be produced?

  97.35: When a single resistor rf, 4zpnty 2nlids-;(is connected to a battery, a total power P is dissipat- pdzs;4r n ylnit,(f2ed 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 battery is zero.

  96.16: When two resistors, having resistance R1 and R2, z5s+qcz e)+i ,zfcoe 2are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following statements about the resistances is co) qz 5 cs+zi2c,o+feezrrect?

  02.46: A hotplate is designed such that it has a resistance of 12Ω when operatia+rtx 8dai-d) ng at 120adra8 i- t+d)x volts. 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 flow2od u,hmtfu1 3 x (9xgke/nsd.s through a 4 ohm resistor that is dissipating 36 watts off(m,g3h 1s .dkxxn2ut9/ed uo power?

  01.24: An electric heater dr+9 g, 3wsj19;roqablv :nnlh aahh:v) aws 13 amperes of current when connected to 120 volts. If the price of elecla+:a:qhlg 9aon, w ;s rvbjh)hn931vtricity is $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately how much would it;saazmwo pd*r9 q83xv 9osa*; cost to keep a 100W lightbulb lit continuously for 1 year atv o;wp3**asmrsoxa99 qz8d ; a a rate of $0.10/(kW.hr) ?

  12.09: A constant current of d0v08z+-btahac575qfz arap 4.00 A through a lightbulb results in a power of 24.0 W associated with the bulb. Which one of the following choices best represents the resistance of the 7zcrb8z5a-htq+ 0advfpa 50a lightbulb?

  01.10: Each member of a family of six owns a computer ra+hfu jr .fj+jh3)z1 zvted at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protected byz+3jv f1.+zhf j)hurj 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 for mf d2bz/4xh/dm a simple circuit as s/bdfx 2 4d/mhzhown 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 fo1*7.,z9o /2ighkh rivfk mkntur resistors to form a simple circuit as shown to the 1 *7.vgok2nhiikf9,rkt/zm h 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 ammete(b16fi-sntj h623rl pxp1e-otpkr 5 bif1k/qr, a switch and three resistors are connecj-rfkpk5 1rt/o2- b61 13fip6le isqh tpnx(bted as shown. 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,ribh2p0qu9. c jve47h an ideal ammeter, a switch and three resistors are conn eh9q.u0 4p2ic7rjb hvected 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 battery, an ideal ammeter, a swihxl3gtt3t 8+4a llv,a tch and three resistors are connected as shown. With the switch open att+vgl,3 a3h 4lla8xts 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 shown to the right, whaw u8,+ku mwomo a-lt 8v:m0zw+t is the equivalent resistance? Assume that all wires are idew0w+l -88m :vm t okaw,mzu+oual, the battery has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit sq.i9kgc9n 1b jfj,by3hown to the right with resistanfqj.g1 9j,39cb nbyki ces $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical r tp- acm1h.(ojesistors connected in a combination series and parallel ciaoh -.c1mpjt (rcuit 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 c-il v lycx7:u*ombination series and li:luy*xv7 -c parallel circuit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbn/c0.sv (;wnf*w lra w9gje-hs are identical. Which bulb will be twefnj9; .lc* s0 avrhw-n/wg(he brightest?

  02.21: An ideal battery, an ide(de6fsfvo6s1;gue ,k numw:/6 fu us6al ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 6efdfuuu e/wvs o16 nmu66g:skf( ;,s2.0 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 5clt ;9 j7w;vx0bupfmare connected b7mc09x u; 5tpvjf; lwas 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 ideal ammed+n:xm+ ziqa 2ter, a switch and three resistors are connected az2 d++x:ina mqs 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?