16.09: In the circuit shown, an electric curyd0l1xibeyg*rc a * djz td2s-a*02,o rent exists in the metal resistor connected to the battery. 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 theyzcxl1i, s0beyo*2dg2-* * 0rajdta d resistor?

  98.06: When any four resistors are connectnrsj+)ab k6l,k87fj 2q wofj ;ed in parallel, the_________each resistor is the;jwn2 fa7 sbk fj 8)r,k+jqlo6 same.

  06.33: A current through the thin filament wire of a ligh tzcfkjif;9 4(o,hj/ ltbulb causes the filament to become white hot, while the larger wires connected to the lightbulb remain much cooler. This h t( jhcz,;ffi9okl4 j/appens because

  13.08: Some standard household lights are bef9o+k 71j tmxdv,zxu-ing replaced with LEDs. LED is the acronym for which one of the following dtz x1o7 fxu9k-+,jvmchoices?

  05.16: A cylindrical graphite resist0mmv l 4wp,qv qev.kt)m ;*a3jor has length L and cross-sectional area A. It e0m v4 vj,mq. wm;)3at*lp vkqis 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 resistivity of the cylindrical resistor?

  98.20: Wire I and wire II are made of the same material.rzjzb)s h:(cbe1o/*js y6oa 7 Wire II has twice the diameter and twice the leng jrz1szyac)*ho 6(o:7 jbsbe/th of I. If I has resistance R, II has resistance

  99.31: Wire Y is made of 70vsgxh/fgz4 no* :uj the same material but has twice the diameter and half the length of wire X. If wire X has a resistanc ov:4sg* /gjhfn0xzu7 e of R then wire Y would have a resistance of

  03.23: A cylindrical resisd*nn(5rgzp s2y a6-x utor has length L and radius r. This piece of material isz2n-ary x p6*n(udg5s then drawn so that it is a cylinder with new length 2L. What happens to the resistance of this material because of this process?

  07.27: A junior Thoma*losib e0 eri 8ua)k/8s Edison wants to make a brighter light bulb. He decides to modify the filament. How should the filament of a lightbulb be modified in ordero beu0k*8r/is ia)el 8 to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors are made of the same material. The 3-iozuzh)no/length and radiui z-3ho/zo)uns 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 mw (t5+.6; e myh ,ixg0spnxupa battery in the f6psu,pn hmm (yx5x;w.egi+ 0tollowing way: “Two resistors are 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 diagra*fo1g8 fgt. tgm has internal resistance 10.0 kW fo t1g*g8ft g.and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the wmxty pe. 6 5-umywscv*ort61v x0, b8compound circuit shown to the right. The three bulbs 1, 2, and 3 - represented as01 m*y6u xe5rw6-wsb x vy,t .m8tcovp 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 /z9.i pitu.n yelectrical circuit at the right. If the current in all three resistors is equal, which of the followniyz/it.p u9. ing statements must be true?

  99.37: The diagram at right represents a simple electric circuit composed vr jy;cr9k(*7ovmy- v3k 4ufjof 5 identical light bulbs ak*r7(vu jcrvoykv -fm yj4;93 nd 2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statem5sf ;glftgh/ yxg m96l *wqk -pi9e7h.ents is NOT true concerning the simple circuit shown where resistors R1, R2 and R3 are have equal 9gf- 9y iem.ql6;wptx7 f /gsklgh5h*resistances?

  17.29: Two lightbulbs X andY are connected in series tox,x,//kut eqrwa7m:r 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 following choices best represents whatx ,r:qtma/xk,we7 /ru is observed?

  06.34: How many coulombs will pass through the identdr-j el 1,t /h3jta3wq fhs;h(ified resistor in 5 second w,a3;qhts-e j tjhrdf31( lh/s once the circuit was closed?

  00.23: If all of the resistors in iud1 -4or,meiid lna+u 8c/q*gdo y0 8the following simple circuit have the same resistance, which would dqnoml-1iei 4di/duud+aor,y gc80* 8issipate the greatest power?

  98.34: In the accompanying circuit diagram, the current through the 6.0 t yyi:3 m.p;st Ω resistor is 1.0 A. What is the power supply v;pmi3y . ts:tyoltage V?

  97.27: Three resistors R1, R2, and R3 are connected ycp txpt *s6r 0y0+f(5tx ant-wtqh yb119fa/in series to a battery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissipates 6a+1tppt0 fh b/t69s5wqxty r nt*0( 1fcy-xya.0 W of power. What is the voltage across R3?

  99.40: Three different re(j 80w9(hmpkfb*a n zzsistors R1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is ha(jmbzk0wz9pf *8n (the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is ttb l0vud (0uwin zn h05u)rpliq-)0 w:he maximum value of the current un )tq-5(rh: 0nv0uu0l0 zwiild)nu wpbder these conditions?

  99.23: What is the resistance of a 60 watt lic0lgpkg)99oel:vx;w ghtbulb designed to operate at 120 voxl g9k o;gp 9cwv:le0)lts?

  03.09: How much current flows through a 4 ohm resistor that is dissipating 36 wa x-w9lbj4c5 gpttsbjxwp4-59cg l of power?

  05.21: A household iron used to press clothes is marked "120 voltzt k4syguh+h2n-9*2 mcer :wh, 600 watt.” In norma-h mhu4 +:cwr9h tz*eny2k2 gsl use, the current in it is

  01.05: Which of the following resistances could NOT be produced by a circy5-uqnssj 3y/uit containing only three ident/ yn5uqj -s3syical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of the fs u0, u)+jags)2pdi4y fz xjc(ollowing equivalent resistan4i +zd2,(yusfp s jgjua cx0))ces CANNOT be produced using all three resistors?

  02.06: Three resistors of different values can be cowig6 5,o)bzx gnnected together in different configurations. If all three resistors are used in a circuit, how many different values of total resistan i,gozg)b5x6 wce can be produced?

  97.35: When a single resi+-;pzz pjnb)s e96wtk stor is connected to a battery, a total power P is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are con -9;zt ne6wkbp +p)zjsnected 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, fexvvb71i;wiyt 09qg+t98 (nuxb ix8 are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following statements about 8tbuyx qgv; 0xe+9 i8v1(wnfx9 biit7the resistances is correct?

  02.46: A hotplate is designed such that h 0l mx(zo iqa0rd*y05it has a resistance of 12Ω when operating at 120 volts. Wh0 ohla dq00xi z(ym5r*at 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 ohm resistor that is dis8b9.6 -lgfusdx,e2 jytp6 ry j1br7sosipating 36 watlx jj eupb6.r ys8 7ty96o 2dbfrsg,-1ts of power?

  01.24: An electric heater draws 13 amperes of current when connected to 128w(xynd 5 xnd35pnt i (l*mof80 volts. If the price ofpo5(3dm5nt8xw*in(nly d 8fx electricity is $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately how much wouldn, uvq y2)sw;i it cost to keep a 100W lightbulb lit continuously for 1 vuqy,s)2 nwi ;year at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results in a powertxu t b+,8q7+xvuo2n3gs xk,e of 24.0 W associated with the vnt8+3q+7, uxbg , koxu2 xstebulb. Which one of the following choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a computer rated at 500 120ww cxo (no9uin qm1watts 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 9m1 2( 0x wcionoun1qwoperating at the sametime?

  03.16: A 9-volt battery is connaw6n.v.(6* vda ibgs 1d oz1nnected to four resistors to form a simple circuit as shown to t. gd 1w1a6ndi6bon.* avs(nv zhe 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 form a sim6/umj82qweb7iq/y p l ple circuit as shown to thpe 7/ umi8bqw6y q2/jle 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, a switch and three resistors are connnbb),f- z6grcish :w7/rxmm;ected as shown. With the swi znhf ,i-:mmrcgr6sbwb 7)x/;tch 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 switch an8l g0(:ybe al*c5z9yzpa1jac d three resistors are connected as shown. With tg( b80l1c *5:zaaey cljy a9zphe 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 t 5cn1q1w7 .k 1nzg ioplb1py;and three resistors are connected as shown. With the switch open as sbcp7 .z; ygn1olkw tq1115pi nhown 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 sho0q /47x48o9yyp z j8wrorb qoxwn to the right, what is the equivalent resistance? Assume that all wires are ideal, the battery has nwbyq0 q 89j7/p o 4yrrxx4ooz8o internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit sybtkx7/(zzbv e88 rw.hown to the right with resistkx zeb7zrbw88. (t/vy ances $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors connected in a combina * 7ug*ftmyhg*tion series and parallel circuit tog 7m*hfutyg* * a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five xo:qd3m/66 pvihnmfn (k2 t *midentical resistors connected in a combination series and parallel circuit to a volta2dt6o*pn6 ikf/ h(mqm 3m vn:xge source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bgzz ; vsf/lhjx09n .r0ulbs are identical. Which bulb will bejzh. 0 fnlz0v ;gs/xr9 the brightest?

  02.21: An ideal battery, an ideal ammeter, a swirfa c kw.) b10jmsq3:ftch and three resistors are connected as shown. With the switch open as shbq c:jfr1sw 3.)0fkmaown 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 f 40.o tpel;q8jl5ecp, an ideal ammeter, a switch and three resistors are connectedj qo.l4ef80pltpc5;e 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 resistorspf9*7 r,cx qfy)zo+ fg8 f/rey are connected as shown. With the switch open as shown in the diagram the9/gpzc7f yefx+yr*rf oq8, )f ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?