16.09: In the circuit shown, aj8g z0 r28r ).pv7ajh3yrrw xfn electric current 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 directionxfyg j)0 h. jr z8pw32rr8avr7 of the electric field through the interior of the resistor?

  98.06: When any four re uu7 pfwq-u7 i3gok5b)k;j,lhsistors are connected in parallel, the_________each resistor is t ujk uhbqo3g,wfp-;ik 5)u7l7 he same.

  06.33: A current through the thin filament wire of a lightbulb causes the fi )vt-ktl642wl90 )qcn ;x+og qmfjwbflament to become white hot, while the l +qw9 gt;)-0tn2flo fblwjxmqc4)6vkarger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are be1mtgpv7(exu-b-mr )*4 nn xbfing replaced with LEDs. LED is the acronym for which one of the following mfeb(t)-x* -7npngb mr1vxu 4choices?

  05.16: A cylindrical graphite resistor has lend )zy(fso- rbci ta0r)-u7c.cgth L and cross-sectional area A. It is to be placed into f-y.7 c0z (oc ur- irtac)bs)da 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. Wire II has twice 30yp gy1bx0 ggmopi*: the diameter and twice 30gpyo1bp xgm :g0yi*the length of I. If I has resistance R, II has resistance

  99.31: Wire Y is made of the same material but:85vtri ukq eczr*(t) has twice the diameter and half the length ik8rvuzrq:*5 ct )et(of wire 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 pieces+ ff,ufo-r5o z)y8qb of material is then drawn so that it is a cylinder with new length 2L. What happens to the rfbs+ 8)oqyur5 f -,zofesistance of this material because of this process?

  07.27: A junior Thomas Edison wants to make a brightesk)5nku6s 8ryp vi7m :+bsvy0r light bulb. He decides to modify the filament. How should the filament of a lightbulb be modified in order to mak)vk6niv0:ypkusbr m7y8s+5s e the lightbulb produce more light at a given voltage?

  16.07: Three cylindrid cz-+z8 en*(izjw: ;ws6ru iucal resistors are made of the same material. The length and radius of each resist(-8uzr +dszj*i6zwi w;ecu n:or 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 u 3ps3 hju5u1h fg;mfvge b(7a *krz2j8+wn)u the following 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.” W ghep 3jhn z+u)3jagm7* f5; w82furuus(bvk1hat is the equivalent resistance of this arrangement of four resistors?

  95.35: The voltmeter in the accompanying circuit diagram has internal ret/sqn:ek)ftb )ty v,tq 7k((0mhhc/ wsistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA.mcs /qn(kb(yk :ftt)v/th70q,ew h )t The voltmeter reading is most nearly:

  97.37: Consider the compound circuit sho-c78 s4tk twzfwn to the right. The three bulbs 1, 2, and 3 - represented as resistors in the dt wzs47c t-8kfiagram
- 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 the right. If fitii :;qs6jj1vw 7i.)x smo: the current in all three reviifixjm)wt:7 q 61sj;s io: .sistors is equal, which of the following statements must be true?

  99.37: The diagram at right represents a simple electric circuit co :6p4g e7,d 1iynwqdyomposed of 5 identical light bulbs and 2 flashlight ceino,4dyg71pyw :q 6de lls. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statemej.as8dw3,a( rc 65ce:zmzhqj nts is NOT true concerning the simple circuit shown where resistorsm5cajs( d6, zqzch: 3e jw.ra8 R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a bjso e;f+)0ei d4gj((q0cahegattery. Bulb X is brighter than bulb Y. Assume all circuit elements are ideal. If bulbsaf c(qesd)i4; go0gjje (0he+ 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 through th+0vq d3 lca/mze identified resistor in 5 seconds once the circuit was d/3lm0a z+qcv closed?

  00.23: If all of the resistors in the following h-kul 7iw77o)nvrxe/simple circuit have the same resistance, which would divxi-)h 7 7klr uwno7e/ssipate the greatest power?

  98.34: In the accompanying circuit diagram, the current through the 6.0 Ω0p mz7/ z nfrri+)3yjs resisto+nzf7 3simzry p r/)0jr is 1.0 A. What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected in seo a)qv 5b,d-1ti ( ;to/hwgtsbries to a battery. Suppose R1 card5o -t/sgb o)t hi1q,v tw(;abries 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 R1, R2 andR3 ar 6+w8zbxeh zj;e connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the currjh wzze; 8+bx6ent in R3?

  99.13: A heating coil is rated 16lbu)b0la9 ,,lpeksnhw./ f w200 watts and 120 volts. What is the maximum value of the current under these coewk9l/ ,)al,hn .sp6 wb lu0bfnditions?

  99.23: What is the resistance of a 60 watt ligxy(2dnyr05(/1.lvp uf ouhtdhtbulb designed to operate at 120 v(tv/n1fy lduxr5hd uo p .(y20olts?

  03.09: How much current flows through a 4 ohm resistor that1 inlwwweeijed2 9pt h5mb+-c(fy.-6 is dissipating 36 watts of power?bc + w6yw m p(wiih-eeed5jn- 9l1tf.2

  05.21: A household iror,ophq joq8 08n used to press clothes is marked "120 volt, 600 watt.” In normal use, the currentq,0o j8hpqro8 in it is

  01.05: Which of the following resistances could NOT be produced by a circuz +ig*d-l ik a6ef2w6wit containing only three identicalii -6wad*e2 k6wg+l fz 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of the following equivalei x4 :39vuna91 yx0sq 3 j1vmdoodze-unt resistances CANNOT be produced using all three rmsn-y o4d39eiu1ujq oxv xz93ad v1 0:esistors?

  02.06: Three resistors of differenc m)ku)oyo. n;t values can be connected together in different configurations. If all three resistors are used in a circuit, how many different values of)u;.knoomc )y total resistance can be produced?

  97.35: When a single resistor is connected t naipy8.25r2l qaoz, ho 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 connected in series using the same battery? Assuyo2 2 rla,zq n5.ai8phme the internal resistance of the battery is zero.

  96.16: When two resistors, having resistance R1 and R2, are connected in pb 1y7 w6i7oucy1cn:vbarallel, th bo7116cwiynbuc :7v ye 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 resistance of 12Ω when oy2rdv :xqp6lz,95im3ue(ynk perating at 120 volts. What is the minimum amount oirvl: pmd9,5kyu(zq26 nxy 3e f 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 resg/ lc74qkrtm33pj.hkqz 2v oczl0 3w;istor that is dissipating 36 watts of po7 j;qvor0qkl2 kz4wpl3hm.z3 t3cc /g wer?

  01.24: An electric heater dra-o,ym a dxv wm*gvdb-r .r9-9jws 13 amperes of current when connected to 120 volts. If ,a gj.wy-r mvdox 9m--vb* rd9the price of electricity is $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately hhai*f+ t-r c8row much would it cost to keep a 100W lightbulb lit continuously for 1 year at a 8*ihtr -rca+ frate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results )d o:l hjnj1*o9qqwn(in a power of 24.0 W associated with the bulb. Which one of the following choices best represents the resistance of th(o 9jdn*jqolqh w) n1:e lightbulb?

  01.10: Each member of a family of six owns a computer rated at 500 wah(j ;e s*jzoz )uab-w ;ado/c;tts in a 120 V circuit. If all computers are plugged into a single circuit protected by a 20 ampere fuse, whatd/zbc(;;- ;h zu o*jeaa)sjo w 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 a simlcm y)ujri,z aen k*0n5;,k;a;kp1b jple circuit as shown to th1jl, 0pakk ;;*z,ebyni)r j5a cu;k mne 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 focwkx ;snl oy:n7lx+42rm a simple circuit as xnnc7o:ly 42s kx+wl ;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 ideal ammeter, a switch and thrqz* q )yh )nfstc-zs l9a*.e/qee resistors are connected as*hazfn- )).yqteq/9sl c qsz* 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, an ide ny* uyxqwe8,.al ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram ,qyx yun.ew *8the ammeter reads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battery,(tsqejh ;pw;* 1b.il n an ideal ammeter, a switch and three resistors are connected as shown. With the switch one *( ;.jps1bqhlt; iwpen 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 a,njgd j/a);n81r yriright, what is the equivalent resistance? Assume that all wires argjnnid1/rya8)r;, j ae ideal, the battery has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent r(udprd4 1tm5o esistance of the circuit shown to the right with resim4 d5purot1 (dstances $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identiywivfj a +vc+ve9 e*b (j7a/y*cal resistors connected in a combinati va f+ecya*wy(ijvb7/j9*v e+ on series and parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resistor-t 5u*yq8t jh9) aqmmxs connected in a combination series and parallel circuit to a voltage sjm u*ay5t-q t9h)qm8 xource.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs are identica2hlq ai13nd,z.fdw)a l. Which bulb will b3 afz.in ql1wh2d ,ad)e the brightest?

  02.21: An ideal battecnu-ph :mx0 iq 11h:ys1/eacery, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram hu1pcyx/i:qa1 ms e:he0 n 1c-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,i ,j8r4( tefhri: l,so an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammet8fhl(e4 :oj,tr,ir sier 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 kdc1:a)hwf6 band three resistors are connected as shown. With the sww k1)6acd :fbhitch 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?