16.09: In the circuit sh1./lz( ahsyp i, nwe-r-ovf* qown, an electric current exists in the metal resistor connected to the battery. Which one of the following choices best depy --l ,nfi1h r(*/ osea.wqvzscribes 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, thcoii 40 e2 he rkn)x)6u3rctrs 7d*s8ye_________each resist*o tiee8r )ic2su ) 3hr0x7n6dr4cskyor is the same.

  06.33: A current through the thin filap bx t oi3j 3m5y-as sdoi0y*2(7syg3md3uii9ment wire of a lightbulb causes the filament to become white hot, while the larger wires connecto2*3p-3y3xm7sdydmi9 s (u0iyi t3 a oigsb5jed to the lightbulb remain much cooler. This happens because

  13.08: Some standard householdh 6 mmppjqbv7 yo3+-:u lights are being replaced with LEDs. LED is the acronym for which one of the fooupp -73qh6 ymv:j m+bllowing choices?

  05.16: A cylindrical graphite resistor has lent47h)kfc /l.wpcsp )f c(xu/jgth L 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 resistffx 4))w7 c/ .lhsp( ucjpct/kivity to the old resistivity of the cylindrical resistor?

  98.20: Wire I and wire II are made of the same material. Wire II has p m+gxb8j2lg:twice the diameteg l2x8jm+b:gpr and twice the length of I. If I has resistance R, II has resistance

  99.31: Wire Y is made of the same material but has tn20;nachd1d9qn pk7: thy *epwice the diameter and half the length of wire X. If wire X has a resistance of R then hdecn :yh0tndp29nq a *kp 71;wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and radius r. This piece of k0nk2iujpknn0l*ogu- / :r9n ae. m)xmaterial is then drawn so that it is a cylinder with new length 2L. What ha ie0u9k2/j.p -an lk g:r)knxonmn*u0 ppens to the resistance of this material because of this process?

  07.27: A junior Thomas Edison wants to makeg qc ht-jj 9p6v,ipd-5h7ixzp:-f2jc a brighter light bulb. He decides to modify-hxdpic pj: q65zj,i7t-gj 9fh c-p2v the 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 cylindrical resistors are made of the same material. The length1jluj2b6glylnpe+* h j lj,:) and radius of 1:ln, )g6h jyb2lj*e l+juj lpeach 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 cono:emh k :dd.dmt4t2q 3nected to a battery in the following way: “Two resistors are ctdq k .m :oh3medtd2:4onnected 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 wz*c(g4qm+ xqthe accompanying circuit diagram has internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter mq4 cz(+q *gwxreading is most nearly:

  97.37: Consider the compound circuit shown to the right. T* h+th -5byjrw/mqi 7t6;o9yinls2 pqhe three bulbs 1, 2, and 3 - ol 9+ hjm6*n2y qprhit-btwq5 is7;/yrepresented 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 ,8wwjnwd g.r2 k,t2rs circuit at the right. If the current in all three resistors2,.w8kt w,nwd jsr gr2 is equal, which of the following statements must be true?

  99.37: The diagram at right represents a simple electric circui+) j si1fnaz- j;def(bt composed of 5 identical light bulbs and 2 flashlight cells. Which bulz -(1 )a;bd fsf+jjineb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT true concerning the simppt6gr*5 5q(lff gv zvhr(/e4ile circuit shown where resistors R1, R2 and* qh4 fvg6rfvp5/lre zi g(5(t R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a battery.,-vxwl: g1jyf a81vn j 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 j gn,a wl1x v1f-:8yvjobserved?

  06.34: How many coulombs will pass through the identified resistorrn9mj jsa04 lmaj1 p9x18n2 gt in 5 seconds once tnjjmr81snx 0a l4ajtg192 m p9he circuit was closed?

  00.23: If all of the resistors in the following simple circuit havowe *kj3g 6k8;(/x bjefdkc 5ie the same resistance, which je*3wbjgfc(56 i;k 8eokk/dx would dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the-ds(ymljtnv(: j 3c ;v current through the 6.0 Ω resistor is 1.0 A. Whn(( vtdysm j cl-v:3j;at is the power supply voltage V?

  97.27: Three resistors gi:xb; j ma)p/R1, R2, and 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 voltage across gmp i:;/j)b xaR3?

  99.40: Three different resistors R1, R2 andR3 ah6 -er:ipq mp*x5k(rxre connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and x6hmx: q-r*(priekp5 R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is the ma5v;0oho o ww;8 dku eqrkc1;cmkw/70m ximum value of theeqw10kcmoc; h;o wkmrw/8k; d5 u07 vo current under these conditions?

  99.23: What is the resistance of a 68lxcf,mk h0v) v4q,m vmkp 84m0 watt lightbulb designed to operate at 120 volts?vm,)8clhp4mmkm48, vkqfx v 0

  03.09: How much current flows through a 4 ohm resistor that is dissipat uzh 3vjsx/298yhdp5qqtm (7ting 36 watts of v(d9tqt/ muhx8 7j 3yhq5zs2 ppower?

  05.21: A household iron used to press clothes is marked "120 volt, hpyla e o476z:600 watt.” In normal use, the curr e:oz ypa47l6hent in it is

  01.05: Which of the following resistances could NOT be produced by a circuit h:ifxw-j hhnb/3 2le 8containing only ti 8nhhx :hbf2-/we3lj hree identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resis+szng yh-w,yr/;h( )j dwpzl2tors. Which of the following equivalent resistances CANNOT be produced using all threedw+)p(ynlzg/w-j sy2; h,hz r resistors?

  02.06: Three resistors :998czqckc ln of different values can be connected together in different configurations. If all three resistors are used in a circuit, how many different valuz 9ncckc8l9q: es of total resistance can be produced?

  97.35: When a single resistor is connected to a batte0i zh3x( yw7 omepsft39x.hf d2-ar4g ry, a total power P is dissipated in the circuit. How much total 0x3fehywdhz(t 4 9237gofs -xmpri a.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, hx vy0c8v:e5cw:0ob j kaving resistance R1 and R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following statements about the resistances is correctbwv c0:ko0 xe:v5y c8j?

  02.46: A hotplate is designed such t yk4h(q a:x 8klpxg)rlw0 viww(.ct24hat it has a resistance of 12Ω when operating at 120 volts. What is the minimum amount of time that it wgkk)hi lw :yp vrx0(w24l(. 4xwctaq8ould 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 di tfpse z9d hmg296+nk4j .p67p/gagxrssipating 36 watts of .66 n/2r9t k p7pzs4f ae+gxj hg9mdgppower?

  01.24: An electric heahaf+ ihvr- 4emetm1 664gwet)ter draws 13 amperes of current when connected to 120 volts. If the price of electricit6f-re4e+4)g6wttmv hha i1emy 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 g9qb+(h8igj b lightbulb lit continuously for 1 year at a rat8+jq9bg i(hgbe of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb resultswnfg(h5k8tun: qan a8)k (s(q in a power of 24.0 W associated with the bulb. Which one of tkh:(a8 q((gfnu tswn nq)85kahe following choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of sheai8i 9r6v3 six owns a computer rated at 500 watts in a 120 V circuit. If all computers are plugged into a single cir9ish ei8a36rvcuit 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 to four resistors to form *0aw3-smuu pu a simple circuit as shown to 30mwa p -su*uuthe 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 resistorso2 9 5ab aocp:l9vl 9ihy8bun; to form a simple circuit a5l9:hai9 n8bv yuob2c;pl9 o as 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 i7 mtdshl+:rpie(7g imnlu 183deal ammeter, a switch and three resistors are connected as shown. With the switch ope p: hi7 l(g3immr 7lne+8st1dun 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, s;feo .5 pfx:ga switch and three resistors are connected as shown. With tf5:;. efpxosg he 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,/(zc6rw/k e5ww0,umjh md*d z a switch and three resistors are connected as shown. With the switch open as shown mm/wkrw*j5/6 e c zwud( dh,0zin 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 rbgrg9sh8 8z3t ight, what is the equivalent resistance? Assume that all wires are ideal, the battery has no internal resistg b988zrs3tghance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit shown to the rightnfzox *8at5 d- with resistan58-o dt nfz*axces $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five iden.ipm+a6yzlis + n ,p(ctical resistors connected in a combination series and parallel circuit to a voltage sourcei6 ziay n.(s++lm,pcp .
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resis)6 ie7vvi6 azjtors connected in a combination series and parallel circuit to a volt 6 aiez)vjv67iage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit di+qa8/)wb b m47ywlb wdagram, all of the bulbs are identical. Which bulb will be the brighteq/lm y4w)b wbab+78wdst?

  02.21: An ideal battery, an ideal ammeter,l mq87xg (;csyrwb10:b3xx bs a switch and three resistors are connected as shown. With the switch open as shown im(y xb0:g8 lwxsx br 7bqsc1;3n 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, absx /wj - 6dg 2(2opkad3zcb2wn ideal ammeter, a switch and three resistors are connw 2gbd2/sab 6xok3wcpd (2jz -ected 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 switch and three resisto -mzfob46wm 4tihm0;o4hch 2 ors are connecm4o2h4bi mzht;w 6cf 4o0om-hted 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?