16.09: In the circuit shown, an electric current exists in the mety/9xb s0d kqo(u1o n4aal resistor connected to the battery. Which on91y okquo0a s4db(n/xe 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 parallelufy:;utkmhgj dx *0,0, the_________each resistort:d0 mf,*g0jky u ;xhu is the same.

  06.33: A current through the thin filament wire of a lightbulb causes the filam b5qwo+1zg.8w + nsjbrent to become white hot, while the larger wires connected to the lightbulb reb8q5+ns+zg1jwb.o wrmain much cooler. This happens because

  13.08: Some standard household lights are being replaced with g 2tqbk q ewih6hj9;95LEDs. LED is the acronym for which one o296bjgieth hk qw;5q 9f the following choices?

  05.16: A cylindrical graphite resistor has length L and cross-sectionq8 uqr4; xr6rtal area A. It is to be placed into a circuit, but it first must be cut in half so thaq 4xrt;8rq 6urt 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 IIj25vjs/zz4c yei2wb xc 59+re has twice the diamete2 xe+cbj5jy59zs iz2 v4e c/rwr 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 twice thejaxrz31v+m/m*- 5l1 vqbpp/pnq f ip+ diameter and half the length of wire X. If wire X has a resistance of R then wire Yb +qz*/1 lm 3vmj1pi pvr5pnf-xpaq/+ would have a resistance of

  03.23: A cylindrical resistor has length 1f0s6 xo bg,qejg4cvz tx+(-zr29m biL and radius r. This piece of material is then drawn so that it is a cylinder with new length 2L. What happens to the resistance of this material because of t2r609vb1c o sqm, 4ij zezbft ggxx(+-his process?

  07.27: A junior Thomas Edison wants to make a brighter light bj3, /et rj1sxaulb. He decides to modify eta,js/x 13jrthe 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 zvy /r -cc9m-bmaterial. The length and radius of each resistorz ymb-v r9-/cc 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 c:f5 wvb5 ( a;xvn )r5r*anxvyuonnected to a battery in 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.” What is the equivalent resistance of this *v:r5;xa y5x(r)fn vvnb w a5uarrangement of four resistors?

  95.35: The voltmeter 79--l- p3 lfdnks t6nb ngyr)bo*r5 nrin the 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 reading is most nenrdp--6 stk3b of*rnb)l-9 g 5nlnr7yarly:

  97.37: Consider the compound cirl *gt reguw3,lzl; 0ec+u91qacuit shown to the right. The three bulbs 1, 2, and 3 - represented a1gzlqler;0 +cul,t uw3 e9a*gs 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 the right. If the current in alp o /6hu;9okj6m3x lasl three resistors is equal, which of the following statemenu j9xhsopko6am6l/;3 ts must be true?

  99.37: The diagram at right represents a simple electric circuit composed of 5fhmv- btx) o-l(2u4xf identical light bulbs and 2 flashlight cxxtm 4) hbu-2(o-fflv ells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the followinjkxo f c/xvzyun.40.1g statements is NOT true concerning the simple circuit shown where resistj0 fzc4.xy o1uvx. n/kors R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a battery. Bulb X is+we:j7ix ni.ooeyg6l; d /p)k brighter th ;ey+. g:diek nixw/7ol )o6jpan 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 observed?

  06.34: How many coulombs will pass through the identifiedby9vk,jb q,, 3kv 2cg785guf yhnuz9p resistor in 5 seconds oncpy32z 9q b j95bgg vf,uvyh8k cn,k,u7e the circuit was closed?

  00.23: If all of the resistors in the following simple circuit h mid8i r;shya ((*q.j,aveax*ave the same resistance, which would dissipate the greatesa yvxm8h,daij* i( q*(.are ;st power?

  98.34: In the accompanying circuit diagram, the curren.zxy,xic:,fk ,0(jhp) rbd qtdlvp /6 t through the 6.0 Ω resistor is 1.0 A. What is the power supply v)xib6c d/hxylf0rqpj v :d.p,z k ,(t,oltage V?

  97.27: Three resistors R1, R2, and R3 are connected in series to a batq.:usmgdh . ul)pse;9ke xut(/+z j)htery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissipates 6.0 W of pod l(z/ukt ;xuq)9e psmsg+h :.h.je)uwer. What is the voltage across R3?

  99.40: Three different resisq ob tdl8w/je/8d srye.(fk 8-tors R1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. Wha .q-yo ld (btj8d8//e8esfkr wt is the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. Whatevf+e)gdl.w im33 :ig is the maximum value of the currei g:w3v)3 le.edi+gm fnt under these conditions?

  99.23: What is the resistance of a 60 watt lightbulb desi ( i4zp:c-q+zh 4erbk1tpsel:gned to operate at 120 v:ec4(pi t1hkrq-4:ezl+bpzs olts?

  03.09: How much current flgrkhc0*p6gsoph0o .-t4 k in2ows through a 4 ohm resistor that is dissipating 36 wank hs.p20ro*-4cih60g top gktts of power?

  05.21: A household iron used to press clothes is uu bdm) vv/aqo )5f*q8marked "120 volt, 600 watt.” In normal use,/) fuau)dvbq*m8q 5o v the current in it is

  01.05: Which of the following resistances could NOT be proydf/,u yw4d6ksul2 8fduced by a circuit containing only three identical,wly8 24 kyfu/us6fdd 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which oe89vioa6.*; s w24 jnlp2 h axtpcy)dqf the following equivalent resistances CANNOT be produaypx92 p d*8q4v he.lt;i)snca 26 jwoced using all three resistors?

  02.06: Three resistors of diff h( n/2tc;zvc)w 9hdn5en(nku erent values can be connected together in different configurations. If all three resistors are used in a circuit, how many different values of total resistance can bevh9nnh e;nc n5 c/wz2uk()dt( produced?

  97.35: When a single resistor is connected to a battery, a total pvy;/n8k6/cuz+prw q luhk 21l ower P is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are connected in serien u+ l r8q u1/y;kc6l2kpz/whvs using the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, havixqis 8-yeq6 8bcn5h o8:wb4zqng resistance R1 and R2, are connected in parallel, the equivalent resistance of the combination is q5cx ow:s4bqnh8 - ey688izbq5Ω . Which of the following statements about the resistances is correct?

  02.46: A hotplate is designed such that it has a resistance ofcpbk(qt h32+ :4 xqyyz 12Ω when operating at 120 volts. What is th:q2qy4(kz bc3 ph+xtye 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 dissipating 36 w.kj: 7goqw 4zlattlkz4 :gwjq.o7 s of power?

  01.24: An electric he8yw8 cj6(tauxater draws 13 amperes of current when connected to 120 volts. If the price ofyc ux6t w8a8j( electricity is $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately he frkv;,8*./db inb mgow much would it cost to keep a 100W lightbulb lit continuously for 1 year at a de,k */bbmnig 8f.;vr rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulbnx aa) l5/kl8p results in a power of 24.0 W associated with the bulb. Which one of the following choices best represents the resistanceax/ka )5lpnl 8 of the lightbulb?

  01.10: Each member of a family of six owns a computer rated at 500 watts in : dvez.dnu,+e 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 :+.e d vu,ndzethe computers can be operating at the sametime?

  03.16: A 9-volt battery is connected to fou 8m l4rf. e0vn0m(paaur resistors to form a simple circuit as shown to theml8p0v(fra. n4um0ae 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 eo;g(4og m66qzja;1dncrt -vsimple circuit atjo6ae4v1 gr6mo;g ;dc-(n z qs 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 three resistors a9 l : 76kaqro3k1kb/k+eexx,cklvp7cre connected as shown. With the switch open as shown in tk 9be37k:v6 clrpkq1k k c/o+exlx ,7ahe 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 ammb 0is0x0zf9z,4 b7efdf5nyz qeter, a switch and three resistors are connected as shown. With the switch open as shownqx f ef590dybzzi z04bnf,0s7 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 swawfbutk8 7tex ,8 8q(litch and three resistors are connected as shown. Withwx,8(ebta u87tfl qk8 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 equivalent resid7eafhdnfx5 fw (h/h+ml;v 3;stance? Assume that all wires are ideal, the battery has no internal resistance, and vdf efdfxhnw5(h; a l/+h3;m7 all three resistors have identical resistance R.

  09.07: The equivalent rh6 . sk3lpf6tgp-kf+wesistance of the circuit shown to the right with resistances k6glp6+-f3 hkfw p.st$R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram b2 y)h-gwhdit 4elow shows five identical resistors connected in a combination series and parallel circuit to a voltage source. 42i )-hgdytwh
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resistors connected (7yp,aqsewh) in a combination series and parallel circuit to a voltage so(qy,a) ph wes7urce.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs are identib:e .e6ey,viocal. Which bulb w. :oe eibyv,6eill be the brightest?

  02.21: An ideal battery, an ideal ammeter, a switch and three resistors ar069nbc5chk /lt(v bv le connected as shown. With the switch open as shown in the diagram the a6b /nkvc tchb59 ll0(vmmeter 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 thqdl 56ubk59z lwu-t7 sree resistors are connected as shown. With theut u96wl 5b-dl5qkz7s 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 1mh quv3n: jm0ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.00muq : 3jm1hnv amperes.
When the switch is closed, what would be the current in the circuit?