16.09: In the circuit shown, an electric current exists in the metal re s +1n lnvimpm );3kq;p :m0u .ubamzx4b1;wkmsistor connected to the battery.n1p;z+b:ui)lumk;4 m;pqav kxm1 3w m0.mbns 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 the resistor?

  98.06: When any four resistors are connected in paralc +d6eai9cb0xobu-u+h* rm9 kr( rir)lel, the_________each resistor is ther(0c-bed io)9+u rur krmc*ax9 h+ib6 same.

  06.33: A current through the thin filament w;f1gz4 vkr.9 u4u0is cqtz:xhire of a lightbulb causes the filament to become white hot, while the larger wires connecte0ghikvs49f .z; r:41xcuz utqd to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are being replaced wi . e): xusfhgmu6p+9m mgzm:gn a4)hf+th LEDs. LED is the acronym for which omz9ag: u+n f sxg+h4)m: p)eumm fgh.6ne of the following choices?

  05.16: A cylindrical graphite resis 26czp1; lgpeytor has length 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 resis2pgyec1;lpz6 tivity 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 h:h huwf0:q 0z.b 4uwnthe diameter and twice the length of I. If uzq u04hhfbw:.hn w:0I has resistance R, II has resistance

  99.31: Wire Y is made of the same materiaf; hjljb48z5s6 jf8mc l but has twice the diameter and half the length of wire X. If wir;cfj6 hmb5 jlsj8z8 4fe 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 piece of. cn.;5ud xezf material is then de .nfz;. u5xcdrawn 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 Thomas Edison wants to mad5ce ir)ta sfs( 9v+zfj,o7*jke a brighter light bulb. He decides to modify the filament. How should the filament of a lighjs 7iscvej )*5t ra9foz,+(f dtbulb be modified in order to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors *6w (qofkidu: are made of the same material. The length and radius of *i(dukow qf6: 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 co kiejaq /a ml;71:bqb-(erp +ynnected 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 irqm1 /el;7bb:a+ay qpeik-j( s 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 internal resi/2qi/rmwmcs-s8n zvx 13bk9 wstance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 m9m3n/zk w-rix mvq1s/bw s8c2 A. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit show x1nl04j(yv.wc l.dgzslfc qq.ry *9;n to the right. The three bulbs 1, 2, and 3 - represented as resistors i w 1q.n* yyl0lj sxf.(9lc;zv4 crd.gqn 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 simpft 7pnl .d0p.0iqjc5ele electrical circuit at the right. If the current in all three resistors is equal, which of the fncl50q7..pt pej d0if ollowing statements must be true?

  99.37: The diagram at uh*h2+po2e3i yc-*r 3lqt gpqright represents a simple electric circuit composed of 5 identical light bulbs and-yh+lc3qho*2 3riutpep *gq 2 2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT trix(;ov zo6 (1sr- 9zan9vyczvue concerning the simple circuit shown where resiz ry1c-9v(vznv6( xoso9;a z istors R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a bat 4rbpz+(7 hzpotery. Bulb X is brighter than bulb Y. Assume all circuit elements are ideal. If bulbs X andY arezzp7 ophrb4+( 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 throky pzw 6 p/pf.12eul8-yzh mvu(ugr 9)ugh the identified resistor in 5 seconds once /vf pw.612zz 9u)eph8my(urlu gk y-pthe circuit was closed?

  00.23: If all of the resistors in the following simple circuit have uz3os nczg2y1o 3(fid6ye *;vthe same resistance, whic1i3yz;uyve dc(3 go zf6ns2o*h would dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the current through the o7usjt, 9v, q jh.-l-ltego5e6.0 Ω resistor is 1.0 A..- 7 ,voeu9,th jjsel5-gtqol What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connecte w4 v*veqg3d g4xsp/:zud s6c+d in series to a battery. Suppose R1 carrxe+ gqw/ ps4z:6vdcd gv3*s4uies 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 are connected in parallel sdtr,bjnw759x r 6eje g1u32kto a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is rs, 6x rng7ewb1 3d952eutkjjthe current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. y(wan:a r)-xm f3z 4y sez8j:zWhat is the maximum value of the current under these condition 3 )fjx:yrz4-m8(snae a zy:wzs?

  99.23: What is the resistance of a 60 watt lightbulb designed tohfg 47q;y/q: ebtt3s s operate at 120 volts?e 4:tq3fby g h;7tsq/s

  03.09: How much current flows through a 4 ohm resistor that is dissipating uk53(g m fg-li36 watts of powerkg( fgi ulm35-?

  05.21: A household iron used to press clothes is marked /ve xdu+9gvm 2"120 volt, 600 watt.” In normal 9mgex/ v+d2uvuse, the current in it is

  01.05: Which of the following resistances could NOT becpp/04 st3)msmo :+v cisx:g b produced by a circuit containing only thre:g mxctm/4sc)+:ps0vp bo s3i e identical 6Ω resistors?

  94.37: You are given threea.6p1via1 i p1v6 mpzmmf7taw) 81zuh 1.0 Ω resistors. Which of the following equivalent resistances CANNOT be produced amp76.) u1 m16p1aiw ziafm1 pz8thv vusing all three resistors?

  02.06: Three resisto,qo f ;hc/4afzrs of different values can be connected together in different configurations. If all three resistors are used in a circuit, how many different values of total ac q4,o;h /ffzresistance can be produced?

  97.35: When a single resistor is connected to a battery, a total power P i qwx7i82f ih+x k11deu):x g6 m/yvfvls dissipated in the circuit. How much total power is dissipated in a circuit if fh w6gu f v7 xq:)kime28yd x/+x1lv1in 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 resistance R1 and R2,,um7k .xcbd* n are connected in parallel, the equivale,7 *. xmudcknbnt resistance of the combination is 5Ω . Which of the following statements about the resistances is correct?

  02.46: A hotplate is design.wwz;: jg( uc+ps ab*wed such that it has a resistance of 12Ω when operating at 120 vol (g.w:u+scw jbzwp*a; ts. What 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 dg.re s m/2dynbbeg51ypt3 3-5az 5awis dissipating 36 watts obadw/ esa 3e25ggytr -b5dp n 3.y51zmf power?

  01.24: An electric heater draws-tm.wcop 3bu:p mynjq:44j3w 13 amperes of current when connected to 120 volts. If the price of electricywt:-4b34:wn .qm3j ujpmcpoity 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 lightbulb hri*;ke caz ohj,6+d9 lit continuously for 1 year a cdka ;*oz j,he6+r9iht a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through uzzss5e0rhon5+;b u 9a lightbulb results in a power of 24.0 W associated with the bulb. Which one of the following choices best reprbsn 5;z5e9us oz +0ruhesents the resistance of the lightbulb?

  01.10: Each member of a famrsrw1 r) s.rk;.y yg l;u+tr8tily of six owns a computer rated at 500 watts 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 operating at the sametik;yl +gr.;r)t s1 r.rruw8tsyme?

  03.16: A 9-volt battery is connected to four k:)3)2maermk -k en obyei3:j resistors to form a simple circuit e o )y3mm:kk2:eik e)n-b 3jraas shown to the 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 si4 0/ct2 xcn:3 g3cu5-+ vlqemvdjhwcy mple circuit as shown to the rx3+d3lc uyvn/jg45w-c cv0ce 2:hmqtight.
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 resist2u r/e pjc8fq*ors are connected as shown. With the switch open as shown in the diagra up8qr2f/ce* jm 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 ammi-;e xbbcpg.7gq e.+inf b16 zeter, a switch and three resistors are connected as shown.bg1fx-b 7b i.6i;egc+.n qepz 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, sbz hx 45j98gya switch and three resistors are connected as shown. With the switch 49y5ghsx 8zjbopen 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 eq -mxw7f;d 4zeone4.o; exs7 scuivalent resistance? Assume that all wires are ideal, the battery has no internal resistance, and all theex-4s7cnmwd.zs ;4o;f eo 7xree resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit shown to r ;yj6ycx5 p:h the right with resistancexpcy5j ; r:hy6s $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors connec .44 qxxtg)p aiqnv(4pted in a combination serixp 444p( xn)qat qgi.ves and parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical7d0orf8lw79;jvb -7bpc oqz h resistors connected in a combination series an7zr7f;l7890p c jo qwhodbv -bd parallel circuit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs mur,smh4+g*41jd psz are identical. Which bulb4umzgdjs ,p +*shm4 r1 will be the brightest?

  02.21: An ideal battery, an ideal ammeter, a switch and three ker i4:i swz1+resistors are connected as shown. With the switch open as shown in the diagram se+1zi4rw k:i 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 batteryn p7dp -gg7o5gt6t yp5, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the y5- p tgpng5top76g7d 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 0s2/v5s ipjt8rvks j:resistors are connected as s 2sj5svkrp8j: vi/0 tshown. 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?