16.09: In the circuit shown, an electric current exists in the metal resicewlpli2 r kv 5b6p..lf9-hj 0stor connected to the battery. Which one of the following choices best describe pr l -bj.56fh0kwl2p.vl9c ies 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 rese3 zxcr 8) 7ejc)1ojpwvjj(z1istors are connected in parallel, the_________each resistorj7 xr8ovc()1 1j zw)jzepje3c is the same.

  06.33: A current through, m6 6 a*prebtvypa+/v the thin filament wire of a lightbulb causes the filament to become white hot, while the larger wir6r +e6ytva, a*b/ppvmes connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are being replaced with LEDs. LED is thsgw8b0xj7oy4 dwgz;4j x80ise acronym for which one of the following gs8 j8bg7x wjs0z40xo 4iy w;dchoices?

  05.16: A cylindrical graphite resistor hasf : xqzxl5b8 i2l70d0maiu.z 81jx fev length L and cross-sectional area A. It is to be placed ixuz0l7 xav0f:1 j .iez8i 58d2xlfqmb nto 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. Wire II has twice the dt bf;t1w5lil4 iameter and twice the length of I. If I ha4tl5;f1tli wbs resistance R, II has resistance

  99.31: Wire Y is made of tb2v u:ml29w qjhe same material but has twice the diameter and half the length of wire X. If :jl v q2w92umbwire X has a resistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has cdix::at6 l7 zocbsrb,a 50:v length L and radius r. This piece of material is then drawn so that ib:l czb7odvtra ,s i56 0c:x:at is a cylinder with new length 2L. What happens to the resistance of this material because of this process?

  07.27: A junior Thomas Edison wants to make a brighter light bulb. He decide+vb2ts0 yki +lc 9d.jts to modify the filament. How should the filament of a lightbulb be modified in order to make the lightbulb prodk+t.d2 t+sjcv i0yb9l uce more light at a given voltage?

  16.07: Three cylindrical resistors are made of the same material. The length aejq0tl;5 (5jfo qk(rdnd radius of ea;q rqtd5 (eokjjf l(50ch 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 resiyt ugyf xm;,7a m*68.ey:gutzstance R, are connected to a battery in the following way: “Two resistors are connected in series. This combiy7z6g,m8u:x;tumet. y*g yaf nation 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 has internqx(: c .k;95qmhc) p a-wuboyjal resistance 10.0 kW and the a qo:ch-;ux)9j ( w5qbapkycm .mmeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit pjkhg3i/p8og )q +fd4 shown to the right. The three bulbs 1, 2, and8 iqfk/4 d3jh+p )pgog 3 - represented 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 electrica)9zs-o fgal o1s4upk;qgg3 2 f;s;b ivl circuit at the right. If the current in all three resistors is equalqb91g;s; i)ls2os3kg zupo- a4fgvf ;, which of the following statements must be true?

  99.37: The diagram at right represents a simple electric circuit composed. az7 pzs9zba1 of 5 identical light bulbs and 2 flashlight cells. a1b. pazzs9 z7Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements iz cdwpdb m;;.h 1f0xs,s NOT true concerning the simple circuit shown where resistom0zcdsd ,hb ;px.wf ;1rs R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connecte gl oocvf2,3b ; +/u4lohhv9zxd in series to 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 re oxfvu2 +9bv zgh;o/h4,o3lclpresents what is observed?

  06.34: How many coulombs will 7odlv*hsy)3 bf*scx n zwkw;-2zn)h 8 pass through the identified resistor in 5 s7cok*dwwysh z32 );nlvxn8s f)b hz -*econds once the circuit was closed?

  00.23: If all of the resistors in thwuw8icfs :o)0tf: ,ho e following simple circuit have the same resistance, whw os )w0f:oi:8ut,fc hich would dissipate the greatest power?

  98.34: In the accompanying circuit d( mj3 ri6uxxy-77 0shg dexwz;iagram, the current through the 6.0 Ω resistor is7s-ud(xreywi ;0 637mzx hxgj 1.0 A. What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3j+jz-j( ov chjb9y(7b 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 ofjyzcjb+(-h7vjo9j (b power. What is the voltage across R3?

  99.40: Three different resistors R1, R vkb86/b-0 zoqx1ie ju2 andR3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the cozb-ie6qj /0 kbx8uv1urrent in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is the maxim kco1yde-.7p zum value of tkcdz1 -.e7p oyhe current under these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designez4lpil q)3)ckj r+z 2yd to operate at 120 vol))k+cll ri qpj42 z3zyts?

  03.09: How much current flows through q 6w)jumxm+ sie4am9.a 4 ohm resistor that is dissipating 36 watts of pow+x96jmui e .m)4a qwsmer?

  05.21: A household iron used to press clothes is jpgwwoho o8al n6vu,/y03u +8 marked "120 volt, 600 watt.” In normal use, the current in/36 na w ouuyhlo8 jgp+ov,08w it is

  01.05: Which of the following resistanv+:u 7s- azopoces could NOT be produced by a circuit containing oa7p-u:vs ooz+nly three identical 6Ω resistors?

  94.37: You are given three srnv 3akj;+-7l5y(l ylm b9mu1.0 Ω resistors. Which of the following equivalent resistances CANNOT be produced using all three resistors?snl j9+yb37yk(; -laumml 5vr

  02.06: Three resistors of different valuess3; jykx a.iut);/.c7husmgwv q :p;q can be connected together in different configurations. If all t xau /..i:w3ktsc qh;j7u q;yv);mgpshree resistors are used in a circuit, how many different values of total resistance can be produced?

  97.35: When a single resistor is connected to a battery, a total power P is diss5eq1)2ym b -y xgna1-msbbl4eipated in the circuit. How much tosbm- -1qb1bg) 4el 2eyy xm5natal 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, having resistane hjlv+wu bafg+g*653ce R1 and R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . ugh 6g5fbeav* +3wl+jWhich of the following statements about the resistances is correct?

  02.46: A hotplate is designed such that it has a resistance of 12Ω ku6j lp: 6urqwv ad,,7 when operating at 120 volts. What is the minimum amount of timv,ulk7, aqrdu 6w:6jpe 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 dissipatin4x (rrlz /s9k; tivvy(:qk1 sig 36 watts of power?sr14xtr;i vk(q:vky/ lz( i9s

  01.24: An electric heater draws 13 amperes of *vnqo0u8x: w h o4 n;bjqd(.twcurrent when connected to 120 volts. If the hu4 8vo0b(jow nw*;.n q qxt:dprice of electricity is $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately how much wo7 5gtd-z 7bwhjuld it cost to keep a 100W lightbulb lit continuously for 1 year at a rate oj zg77tdw- bh5f $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results in a power o.q( mxcwk 4clqa f1*s6f 24.0 W associated with the bulb. Which one q41a(qsc 6wlk.m*cx f of the following choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a computer rat8,twb0* 0 bm:xkyrhpked at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protecte0t x,k: pkyb wrhmb*80d 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 resistorqzbv) 4k; mchi6v:jb ,s to form a simple circuit as shown to bm c;jkzb4) qh ,iv:6vthe 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 form2b r zx:kw2.7j2 w)ptm v9b+ao6gauel a simple circuit as shown to the rig2wlu6ragba+b)pm.2evw7 2t :kxo9 zjht.
What would be the potential at point B with respect to point C in the above circuit?

  02.21: An ideal battery, an ideal ammeteu c8oa( x2j-s cpumz5tzrp4*0 r, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes. (5pzp ju xr2mc0z toc-a*u 84s
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, an ideal ammete tro(5svd qlcne /8a6qe +2vc2r, a switch and three resistors are connected as shown. With the switch open as shown in 2c+qqv2 t acn5 sel6d8rv(o/ ethe 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 idea *+935wbztu; zuyyffty -3lrzl ammeter, a switch and three resistors are connected as shown. With the switch oy- +3*yrzf; 5tfw uz lzb3uty9pen 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 ri5f mrfo7oht+ k+uww.m +oszc(4 s16to the right, what is the equivalent resistance? Assume that all wires are ideal, the battery has no internal resistance, and all thre+. wo 51o7omf 4u+fm(h+ckrs wsi6r tze resistors have identical resistance R.

  09.07: The equivalent resistance of the7w m1zyb d:momq2e0e8am2 m0v q9z7xo circuit shown to the right with resism9odm7yb om q2emm7v0zza8:02 we x1qtances $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical recwbx ce s k5kk-7lba07 8-c3ihes,af3sistors connected in a combination series and parallel cilsabeaw57c 0 cc-7ih3x 8- bekksf3 k,rcuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows q6 spj s.:juq.five identical resistors connected in a combination series and parallel circuit to a voltag:s q..uq jsj6pe source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs are identica0nelryj : oe,.r0)ymc l. Which bulb wiln0lm yor)ec,e:yj r.0l be the brightest?

  02.21: An ideal battery, an ideal ammete8k*lpjbig w 3 t; eb:*ylu/ht0r, a switch and three resistors are connected as shown. With0g:k u j/le38b* pitbwl*;thy 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 ideal ammete0p0dw1cufc5 efqf ,h hbk(a8-*tfqy8 r, a switch and three resistors are connected as shown. With the switch open as shown in the diagram a 5fqb8*ch w(t0 -p0fu,hdfcyf eq18 kthe 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 resistors are v yyokjx(/x3 kd9hy11 connected as shown. With the switch open as shown in the diagram the ammeter re1 xdxh9ykj3 yok/1(yv ads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?