16.09: In the circuit shown, an electric current existshresk y.8g v01ru(2 uccwd6 6e in the metal resistor connected to the bswy veuu.6h6kc82dr1g re 0c( attery. 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, th t42.(nxke(pj,x 7jvxu 4cdve e_________each resistor is the sau2tev(pn7.4,jx v (cdk4x jx eme.

  06.33: A current through the thin fil.wyrz v3ezh( 4ament wire of a lightbulb causes the filament to become white hot, whilry(hve z43z.we the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard eoli r7 znhy6)hz4)o :household lights are being replaced with LEDs. LED is the acronol) z: 7ozie6rn)h4 hyym for which one of the following choices?

  05.16: A cylindrical graphite resistor has length L an*l/j( ko hx(yld cross-sectional area A. It is to be placed into a circuit, but ilj *h(oxyl(/kt 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 are made of the same material. Wire II hppr 1 9ji8dwdi3 ,pos2;trw6eas twice the diameter an tdr p13;jwriopspi,w e68d92d twice the length of I. If I has resistance R, II has resistance

  99.31: Wire Y is made of the same material;i0(*1rx0( c+ debih ) ox6aijck zpyi but has twice the diameter and half the length of wire X. If wire X has a rexhr01iiczd(+ijc*a )bik( ;exp6 y0o sistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and radius r. This piecev vzthl/k*4t 1tfm:9zu ;ep+2mlo)cc of material is then drawn so that it is a cylinder with new length 2L. What happens to the resistance of this materi c1;o 2p9ktuvlt)f c z/ztvem l:m*h+4al because of this process?

  07.27: A junior Thomas Edu38a;fhnp x9 tq0u0 pzison wants to make a brighter light bulb. He decides to modify the filament. How should the filament of a l azux h0nfp9; t3q0up8ightbulb be modified in order to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors are made of dz8n50slk)iomj ftxj :.p (h mrg,; f1the same material. The length and h.zif t:kd() g 05,;j1 lsofnm8mjrxpradius of each 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, are connected to a baounu04wxl ohis78, n1hs2l6w ; pl3oittery in the following way: “Two resistors are l;ixsw4w8i3 n7h6l po2ohl s,10o unu connected in series. This combination 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 diagram *0c1.d2k oe1 chnoeishas internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is most nearlyhoo 2c0.ke edic1s1* n:

  97.37: Consider the compound circuitr7bbn(ow ;fi-gkiy )6 shown to the right. The three bulbs 1, 2, and 3 - represented asi fwoy(i )6n 7bg;-krb 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 th g3v1d)54y+xnm 55pozg/0jaq i g8w:ikl hesp e right. If the current in all three resistors is equa)lm g/+5:z yenx3gh5swpp8q ogv ikad4 i150jl, which of the following statements must be true?

  99.37: The diagram at right represents a si,) ak68 i3hi q4odyto2 yzki4tmple electric circuit composed of 5 identical light bulbs and 2 flashlight cells. Which bulb (or b,28ahz)6 4 oyiyiotkqt i3k4 dulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT psiu .q5;azzf )ry0 :vtrue concerning the simple circuit shown where0)zf p :yz.rv;qsai5u resistors R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in se/:mz4djjln)u msjnq ne 6v u7.) )qt0kries to a battery. Bulb X is brighter than bulb Y. Assume l nq/t )n6)v4q)ndjmjsjkm .e0:z7uuall 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 observed?

  06.34: How many coulombs will pass throurtkb 1/ysuj6v- xys c:f*a x63gh the identified resistor in 5 seconds once jtsx 3-61 kbc xu6yvsyr:af*/the circuit was closed?

  00.23: If all of the resistors in the following simple circuit have xmh7b 4as3 pc5u13 lnothe same resistance, which would dissipate thebo3p5a31s7hn l cmx 4u greatest power?

  98.34: In the accompanying circuit diagram, the current through the 6.0 Ω residpancmhkkg n *.9gy4kh/*- : she/,m/ gcm(dtstor is 1.0 A. What is the power supplys(,npm- /cht9 **cmg kyna/.:ke/ghg d mhdk4 voltage V?

  97.27: Three resistors R1, R2, andq-qqg./fl2t2)g 5wp+ob esk r R3 are connected 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. What is the volt-qloegkqf5/q 2+.) bp wsr2gt age across R3?

  99.40: Three different resistors R1, R2 andR3 are cls6z+ : fvl)wov+h-bw onnected in parallel to a battery. ++w)-lv l: 6 zobhswvfSuppose 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 1b1f; 9 c- o (hulaa.p6xbfje.k200 watts and 120 volts. What is the maximum value of the current under these conditih1ub 9e.pc6o l;ja(ff.xb ak- ons?

  99.23: What is the resistance of a 60 watt lightbulb designed to operepv6w(1jzaay3rr1/o:v e3 4oe ep lh;ate at 120 voltspa(r o;3y6p:ev 413 /oeljehzrw v1a e?

  03.09: How much current flows through a 4 ohm resistor 1wz i2plr ejr2( ab,r(that is dissipating 36 wab,zrr (ia1jerlw ( p22tts of power?

  05.21: A household iron used md16q z w)wxrkawofz5w,(h 7,dw6np1;k xbe 8to press clothes is marked "120 volt, 600 watt.” In normal us m,xz,nrbdh 8p7)5(qo6fewawd 1kz wx6kww1; e, the current in it is

  01.05: Which of the following resistanc hmk,x/z6ym nt wt: :1mjv):vzes could NOT be produced by a circuit containing only three identical 6,m/v nj mktw)zyv z:t6xhm:: 1Ω resistors?

  94.37: You are given three 1.0 Ω resp4q2hmc*kkw c fs )mpp1 154dvistors. Which of the following equivalent resistances CANNOT be prmq1h 4kck4*v) sm1w dc2p5ppfoduced using all three resistors?

  02.06: Three resistors of different values can be connected together iqbl,1s rsa:j5 n different configurations. If all three resistors are used in a circuit, how many diffar5:1,sbjqs lerent values of total resistance can be produced?

  97.35: When a single resistor is connected to a batter d.s 7xw4k,ew m9s8wwey, a total power P is dissipated in the circuit. How much total power is dissipated in a circuit if n i4 .dx ,7wssmw8 wee9wkdentical resistors are connected in series using the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, habv;v;ozdtcg6 n w /px1d,9,uyving resistance R1 and R2, are connected in parallel, thv9uxp;,ydt;1gwbnzo /,v 6cde 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 r5or)q6i,wbe bm3f ymp0kjd:0 esistance of 12Ω when operating at 120 volts. What is the minimum amount of time that it would take tow06yijq5or:,0)fb bke3 p dmm warm 0.45 kg of water from $15^{\circ}C$ to$85^{\circ}C$?

  03.09: How much current flows througicowqa7h. /k2 h a 4 ohm resistor that is dissipating 36 wa /7cwaohk i2.qtts of power?

  01.24: An electric heater draws 13 amperes of current when connected tzu hujz2z6q6rrh clbf9.d*8+o 120 volts. If the price of electricz d6z8qrh *f hu29l+6.c buzjrity 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 100W lightbulb lrw telbz82 - pge;oc*3it continuously forcwe8g - p2bz ;*otr3el 1 year at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results in a poxvz7qpzm z/e b3;rb.ks)(ugmd7 gs.9 wer of 24.0 W associated with the bulb. Which one of the following choices best rep(rks g/zdzb37m ..gv;qb7z )ex9um spresents the resistance of the lightbulb?

  01.10: Each member of a fami pcpc-++xo/g rly of six owns a 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 x/ grop+c-p+ cnumber of the computers can be operating at the sametime?

  03.16: A 9-volt battery is sa cbyelb(yq 1yd /56sim tjvgj7.94b;xb:,jconnected to four resistors to form a simple circuit as shown to th l v:45jxigyqbs c;6a7. (tj19bbdj,smey b/ye 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 i6 k5yar qbk-o3vi.;b+p; wih form a simple circuit as shown t6. bbyikhv+5; k ;qiop-wra3io 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 8f2 x asup1,1(;7nkyd onciw2gkgsg/ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.f yo8aknux;pnk1gs(gcd22 71/ i,gsw 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 i6)sij ab 1qg/switch and three resistors are connected as as g6)q/ii 1jbshown. 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 switch and thrpa2l q-fc:1a hcd 22cyee resistors are connecpq1-ya lch 2:2fa2 cdcted 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?

  12.14: For the circuit shown to the right, what is the equivn/foch0. n-ls: 0nu cgalent resistance? Assume that all wires are ideal, the battery has no internal resistance, and all three resistors have identical resistance R.nc0 cnu-0nf:.og l/ sh

  09.07: The equivalent resistance of the circuit shown to 8 ,+4rttya -tvfwooi 5 va2n3jthe right with resi5+nt3fwvo42ti oatv,a 8 jyr-stances $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors connected in i jll)nf6mb: w1.y3eegg9 a9z a combination series gla z fn1l:3)g yi9j6.bew 9meand parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram be8e/ub2 z e*nk 6f.ob6wcr vxa:low shows five identical resistors connected in a combination series and parallel circuit to a 8/f*6 ozbb kc.2w aen:e6 rxuvvoltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of them0p 0pbdl+0u(x txbv, bulbs are identical. Which bulb will be the brightest00lupbt+dmx(bv,x0 p?

  02.21: An ideal battery, an ideal ammeter, a switch9t8 c6j0bd7wwo6xz(w0gia b7sqv e k3 and three resistors are connected as shown. With the switch open as shown in the diagram 3k6zwb0(qxj tsc 7w iew0o6dg 79vb8athe 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 resiymmo-oyxqxbwgoc9- g1 9 eiam(:c:59stors are connected as shown. With the switch open as shown in the diagram the ammeteco:9gw (igoy--59maecob y9 qx1x: mmr 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 an v-dn byt 6a9n33yzgc9d three resistors are connected as shown. With the switch open as shown in the d3a9tny9- znyvdc g36 biagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?