16.09: In the circuit show6baw ,nf*/umqmt rfi er6s/3-n, an electric current exists in the metal resistor connected to the battery. Which one of the following choices best describes t a6wt6r/3mfsmibnf-u e/q*, rhe 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 connectnbiq+hwiu y/oq ,y4zj*u1bl g79(qw 1ed in parallel, the_________each resistor is the47*,yii n o /u(+q1wwqj9zu1 bgbyl hq same.

  06.33: A current through the thin filament676;nhfptr9pc wiys0 wire of a lightbulb causes the filament to become white hot, while the larger wires connected to the lightbulb remain much cooler. This happens becauh76t spy0cn; 9ifr6wpse

  13.08: Some standard h jl .lgthxj-k yy8gnu3+plf.,27u/ xiousehold lights are being replaced with LEDs. LED is the acrjgy8 l/ i7ljt,+.2-u3fpnyklg . huxxonym for which one of the following choices?

  05.16: A cylindrical graphite resistor has length L and chg.zgej +ny)8* cye2vross-sectional area A. It is to be placed into a circuit, but it first must be cutec )gg nzh+8 2yj*y.ve 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 bqj7g;m m x.4jmade of the same material. Wire II has twice the diameter and tw;7 jjxb.gq 4mmice the length of I. If I has resistance R, II has resistance

  99.31: Wire Y is made of the same mljbbjph 84 :fvp,g.j, 6nlpp 3aterial but has twice the diameter and half the length of wib3p:8j vfbpp,hp .4jljng,l6re X. If wire X has a resistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and radius r. This piece of materi0v hdm9m. .wdnal is then drawn so that it is a cylinder with new length 2L. What happens to the resistance of 0 .md9d.nwmvhthis material because of this process?

  07.27: A junior Thomas Edik+sc u+a7czfv r 4 33se56legqev5q*qson wants to make a brighter light bulb. He decides to modify the filament. How should the filament of a lightbulfc354ru ve+z57ce eq6 qk+sgq* l 3savb be modified in order to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors are made of p0-1 slt y7ejwthe same material. The length and radius of e l0y1-ws 7tjpeach resistor 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, a*qfrrtrj4(b-7k1s h dre connected to a battery in the following way: “Two resistors are connected in series. This combination of two resistors is connected in parallel t*14(r 7rjs dfb tqh-rko 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 resisr;8 ,27cqpqp)klzpdctance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1, ppqrz)82pkcc q l7d;.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. The tn-tec5p orikl3u(/9 u4n xkj;hree bulbs 1, 2, and 3 - represented as resistoknlr-xot ce /( 3pki9;u4u5 jnrs 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 c anjrfx4- n ldo9o6 w2f0jhv);98asihircuit at the right. If the current in all three resistors is equal, which of th v2f)wh;nxoj9f rh9 8l6 ji-d4aosan 0e following statements must be true?

  99.37: The diagram at right rep))b n 6s 9vpi/vmnelx8x/q2 rvresents a simple electric circuit composed of 5 identical light bulbs and 2 flashlight / xr)m/eivnnv 6lb8 vp x)qs92cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT true concerning the s +4n tlo(e2a wj(yg9xqimple circuit shown wg9lejntx yw(24qo (+ ahere resistors R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to /asng,y)3ays:pg 9 ar.x uu4wa battery. Bulb X is brighter than bulb Y. Assume all circuit elementswg.p9yr, aax/u):gys4 s3u an 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 observed?

  06.34: How many coulombs will pass uowye a n.8i3pz0wm+/ through the identified resistor in 5 seconds oniz aupywo8.wnm +03e /ce the circuit was closed?

  00.23: If all of the resistors in the following simple circuit have twhhp1(fc* lf*2 liy2dyj ) 0dkhe same resistance, wh wldyd (2fi*1f2hlhk*p y0)cjich would dissipate the greatest power?

  98.34: In the accompanying circuit di;n41xwodo: ) ao uf wetlanr+1it: 8.pagram, the current through the 6.0 Ω resistor is 1.0 A. What is thtw:i4.nr 1ou)xotna8dp+ ae l wf 1:;oe power supply voltage V?

  97.27: Three resistors R1, R2, and R3 a8galjk y6upe+ t 320rgre connected in series to a battery. Suppose2rye +agt6g8plj03k u R1 carries a current 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 uaa,pqw71( y :g/nszi R1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V :/, nw1a(q7uzysp a igacross it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts a/.+vngniodr spky)d5gg ,x9;nd 120 volts. What is the maximum value of the c,.o ikv5+9 ;sd/pyrgng)g x ndurrent under these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designedm *y*yp:oy*:qha pc+e to operate at 120 v p*:+:ay**h qmycpyoeolts?

  03.09: How much current flows through a 4 ohm resistor that ; zt7aa6uc;vi8k)gwkis dissipating 36 watts of pow8i7wvkgz; 6 )tu;ac aker?

  05.21: A household iron useh89.gm3u;fo an7 dhxpd to press clothes is marked "120 volt, 600 watt.” In nor. 8nx9 hfuaodp7g3m; hmal use, the current in it is

  01.05: Which of the following 45*i, q+fc.s sk6 rjwzc .gllzresistances could NOT be produced by a circuit containing only three identical 6Ω resistorszj4.s.sl lq6r*5gi ck,cw + zf?

  94.37: You are given three 1.0 Ω resistors. Which of the following eqfggv* 1u2r 4dcuivalent resistances CANNOT be produced using all three res v 2rg*cdu41fgistors?

  02.06: Three resistors of different values cw,z zk)-6b/6c dq0kc12gzjn h( tyapwan be connected together in different configurations.g06 -(/1hq w, nzztj a)cb6kc zpdwky2 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 ba0dt/w2/ssj7f lud9s ,q :mv ddttery, a total power P is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are connected in series97ssdu/t/wsl:jvfd m,q0 dd2 using the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, having resistance R1 an34-x h+sm +cuah/k kox,d4sfnd R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following statements about thfcx/4,kh3msuso a ++hndk x-4e resistances is correct?

  02.46: A hotplate is designed such that it has a resistance of 12Ω when operativ i6k8l.(stp+ioes6o, u lsy7ng at 120 volts. What is 7ovt(6+8i ysslo.6 usplk,ie 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 ohm resistor that is dissipac fzn2+1hw ql)ting 36 wahw)nlzq2 1f+c tts of power?

  01.24: An electric heater draws 13 amperezdk4o1bvntf1 :o 7 mm6s of current when connected to 120 volt1:n 7ovkb1m6om zft4ds. 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 w1srg63*2mcd 0y xfnw am5;vbvould it cost to keep a 100W lightbulb lit continuously fgnwy0*sva6 c1mrdx;b52f v m3or 1 year at a rate of $0.10/(kW.hr) ?

  12.09: A constant curren if5o-;/)bd el7r -vc+bdlmprt of 4.00 A through a lightbulb results in a power of 24. b-fvmr-l)+ p7dble5 iodc r;/0 W associated 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 at( o3phi 5of8osw(il5 computer rated at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protected by a 20 ampere fuse, what is the maximum number of the computers can be operating3oi ioth8( 5sp lf5o(w at the sametime?

  03.16: A 9-volt battery is connected 64v12baux m kie+g ;b gpi.u+ixt**w,zma j6sto four resistors to form a simple circuit as shown to the rigxm *;.su+61 axmw ig j2ig te+*z,k64pa vbubiht.
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 j,qz08hb3max m9 z)ubsimple circuit as shown to the jz 83 )m0hbb xma,u9zqright.
What would be the potential at point B with respect to point C in the above circuit?

  02.21: An ideal battec38epfhbms6 ,sind0) ry, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 ampere)0h8,nf mb s6sd3 iceps.
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 resistowplr t 9w.uygy qc)2 t64e91lirs are connected as shown. With the switch ptc1.wtw llr24g699)yu iqey 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 idy*y2mw/l p 1xfil+cs*ph0 ;ezwy( d9u eal ammeter, a switch and three resistors are connected as shown. With the sh;c*0 sy 2pwz*yl(mx9f/wyeu1ldpi+witch 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 circuit shown to the right, qlwe,2teu-2gw k. h xbif ls.,x2 /eh,what is the equivalent resistance? Assume that all wires are ideal, the battery has no inisww2tq. x-b,,2 lgf,.exel/ 2ehuhk ternal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit shown to the right9)mo1w : x ,ej4xzcz*ql +qcvt with resistanceslc cvx9jtw ,4mo*x +qq:ze)z1 $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identicm-kiiyhk)bs (4w8b83 zsky4u al resistors connected in a combination series and parallel circuit to a voltage sousyhk sbk k(iz8yu m-3b i44w8)rce.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five ijhlbkr7 f0aa 6j 0zv00n-elv+(cgxf*dentical resistors connected in a combination ser +cn-z lb7hv 060eavjkxj(l* r ga00ffies and 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 bulbs are identical. Whic.j1edh7rh w7th bulb will be the b.7j7rhdw the 1rightest?

  02.21: An ideal battery, an ideal ammeter, a switch and +,o).peyscvugddt )qf/ 79 jtlp-8yd three resistors are connected as shown. With thj.e ct/fu syq +odd8)p g)lp,- 9dtv7ye 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 switc ;+8k/y 6*)mrlp.;szxbzjaz4 gn b6-wuclrvvh and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 ampepl xj v8rgam6-b . 6z*s) ;;/rbknl+zuczy vw4res.
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 as+ws7322 ui g6edzoq boj; t;nre connected as shown. With the switch open abosgu2+it ;3j q oedn6s ;w27zs shown in the diagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?