16.09: In the circuit shown, an electric current exists in the metal rez iw 7 6 7jvru2jy8svy81v11nr/qoxb osistor connected to the battery. Which one of the followisbrx7uy7vy18v6j wn/2 v1z ojir18oqng 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:c 9)0dn ntxfg:ceys , resistors are connected in parallel, the_________each resistor is the s),:9c df syxng0tce:name.

  06.33: A current through the thin filament wire of a lightbulb causes the fila b7t+a8cfhf ,sdtmn gx;z36u+ment to becuf,zng8s3+dhc x;t6 t7+a fmbome white hot, while the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lig8u 6a8zxxwtk.zh) b6lhts are being replaced with LEDs. LED is the acronym f x8txw66zkalb.z8 h) uor which one of the following choices?

  05.16: A cylindrical graphite resistor has lengtho5x )7rdmz7 qpworgw . i,tg1( 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 resis gt w1m7xrqo5,i7o)g .zrpd w(tivity to the old resistivity of the cylindrical resistor?

  98.20: Wire I and wire II are x5q kyl39c0:wzoj;vh+o p, nx made of the same material. Wire II has twice the diameter and twice the 5z3x:9,pjv q o+hw 0ycxn klo;length of I. If I has resistance R, II has resistance

  99.31: Wire Y is made of the same material but has twi83* q 0 usza3fb3 9qfd6yypum3z 3esnice the diameter and half the length of wire X. If wire X hasm0aysf3dy6uz 8qn9q3pbz 3efi s*33u a resistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and radiup: m6ds4x6mvj pouz(7/4 jxj1zu m gj/s 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 becavp4 jxjmp6gu/zox ud:1/sm 6jj( z7m4use of this process?

  07.27: A junior Thomas Edison wants to make a brighter light bulb. vn nrc63 e7bk wp)6x7dHe decides to modify the filament. How should the filament of a liv 6)rx nd76pk73wbencghtbulb 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 material. The bva-c0jtq * c0 .fcqo-length and rabfvt c0-ca j*c0q-o .qdius 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 y w-v;7h wnk;k(fee sqv4tz- 4)( rfcdconnected 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 equiv7;zvwc( sy)4 k fee;(rnwd-vh-ft4 qk alent resistance of this arrangement of four resistors?

  95.35: The voltmeter in gmj, f 1iji14tt/vr+)y tuo0g/k /sg pthe accompanying circuit diagram has internal resistance 10.0 kW and the 1+kt4rtiy/, vpog1t si)/jfjg m g/0u ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuba;95lv(d18xtwpogpkyy; y.,uj(x qs( x xq1it shown to the right. The three bulbs 1, 2, anb; ja9kqw(,v8up; y1px.syl dg(xyx5o xq t(1 d 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 electrical circuit z3hm.kjyt*u.1vm a4p at the right. If the current in all three resistors is equal, which of the .mpaj1z.k hvm3ut4*y following statements must be true?

  99.37: The diagram at right represents a simple electric circuit composed ;.8udkjz aeyk ,hr;, kof 5 identical light bulbs and 2 flashlight cells. Which;e z.k,a kk; du,rhyj8 bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT trging d ;*m4l6jue concerning the simple circuit shown where resistors mg*i4l6d; jgnR1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a battery. Bpduy1 2,,ma +q x-qiqsulb 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 batm, 2iq 1q,puyxs+a -dqtery, which one of the following choices best represents what is observed?

  06.34: How many ce-tx- bl.ufp ,oulombs will pass through the identified resistor in 5 t,-x lp-ub fe. seconds once the circuit was closed?

  00.23: If all of the resistors in the foly 0uw;uo /(aehlowing simple circuit have the same resiw(0;oyau e/u hstance, which would dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the current through the 6.0 Ω m;f bh svk(flsb5y48 0resilm b ; 8sfb4kv(0s5yhfstor is 1.0 A. What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connecgs5via46 3ow 3 6cpdhkted 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 of power. What is the voltage acrossog6cawk5ih63 34 p sdv R3?

  99.40: Three different resistors R1, R2 andR3 are connected in parallel to ig) /qavzh/rz3xxi 9. a battery. Suppose R1 has i).rvxhzx9/iz/ qga3 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is the maximumtm tp8vqu6ed++o-zu 18y* xebadr0 n, value of the current under thesrp t86uz0+ v baumxo en81etdd y*-,q+e conditions?

  99.23: What is the resistance of vrki.*ig 1)3maswq:pm x +qi- a 60 watt lightbulb designed to operate at 120 v +ir1ga sqkp:3)-i qm. vxwmi*olts?

  03.09: How much current flows through a 4 ohm resistor ():zw qjmd -gtthat is dissipating 36 watts of(:q)m g wj-tzd power?

  05.21: A household iron used,d;yqy*b --qc) h/ xqc;lq/hy6ghpra to press clothes is marked "120 volt, 600 watt.” In normal use, thga-hh/q/6pq lc; hb-)c qy*,;ry qxy de current in it is

  01.05: Which of the following resistances could NOT q3w h6hq-nyeb:0+kh7fl+ef9;k eg co be produced by a circuit containing only thh0le- q6:ocybkfhfqe3eg 9w ;k+n+h7ree identical 6Ω resistors?

  94.37: You are given 2xnn+nek zq:8qw9id5pf* - fx three 1.0 Ω resistors. Which of the following equivalent resistances CANNOT be produced using all three resistor+59 x epxqnz2wn:*fd -nk qi8fs?

  02.06: Three resistors of different values can b;f3j7swlo s b:ts 3oq.e connected together in different configurations. If all three res.ss7bf 3slwoq;t3: j oistors 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 powe) 9z)rpndxlj-r P is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are con))j-pr9 dznlx nected in series using the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resistors, having resistance R1 auf5kw/vk*3nj,7 v cfd nd R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following statem * 3vcd vk7ffuj,/k5wnents about the resistances is correct?

  02.46: A hotplate is designed sumjzkl-2kytu dq0uz3 ewv6w o -6d0+s1ch that it has a resistance of 12Ω when operating at 120 volts. What is the minimum amount of time that it+j 31qkywudzsv00- kdl -u62e6z wtom 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 resistw10em v)o f7(6;j isewhw; wb) h-folmor that is dissipating 36 watts of powerweijlf1w ;7 sv e60h) f-mhwmwo;)(ob?

  01.24: An electric heater draws 13 amperes of current when connected to:haz4;+p*7 kfqfrsbxl+v. j/ l lx r6e 120 volts. Ifxf:e6*lz kaq/ +rvs;fpb7 l4.h x l+rj the price of electricity 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 ;m ddjitnl5);to keep a 100W lightbulb lit continuously for 1 );; nm5dtilj dyear at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lighos) 8e): +pl qpdd(hvitbulb results in a power of 24.0 W associated with the bulb. Which one o(:+psi edlv dpo)hq8)f the following choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of hltn4-;vm,o p4w/vdi1p dtzc75z yb.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 computerl7z ;y5i.z4 nv -4 ,1hd mtp/vcbotpwds can be operating at the sametime?

  03.16: A 9-volt battery is connected to four resistors to form a simple circuit 4vf,t)v vo:nxas shown to the right.v)ntv,x: 4 fov
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 con)i.7ug/ b9ii nq7zq,i wb an9qnected to four resistors to form a simple circuit as qi9wigz uabqiq7.i n, 9n)b7/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 resih asy2kc t-); k,f-qsustors are connected as shown. With the switch opeaf-k,)ysuq2cth-; s k n 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, at *yql15s7m:d)tmzn xd wc q4e8a.m.y switch and three resistors are connected as shown. With the switch open as shown in the d)* da .mt1zsdc.4qwmt: xy8q7lyn 5emiagram the ammeter reads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battekc42x-uj ica p,5rty,ry, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagra2cacxu-t rk,5j,4yipm the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?

  12.14: For the circuit showod 6iloj0h03 mn to the right, what is the equivalent resistance? Assume that all wires are ideal, the battery has no internal r3lio 6dh0j0om esistance, and all three resistors have identical resistance R.

  09.07: The equivalen;/tp)2rnwf gx c35c3iv.6tb bjr; hygt resistance of the circuit shown to the right with resistt56cr h ;rgwpvgxib 3n2;jb ) yfc3./tances $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five idens.;uf-g- 3qellxlp: ltical resistors connected in a combination series and parallel circuit to a voltage source.-eflqx. s:pl3;g l-lu
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resistor t7aj;:qfb*+r ;eh4w slpwo0(c 9qjhgk0tlt+ s connected in a combination series and parallel cwf0q a;c 9trhgj sp 40e+:+khtq w;bjll7*(ot ircuit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of th7g3i)s3n5+ijgqw co 2: b ydrke bulbs are identical. Which bulbickji7qgyw: 5rs2)bno3 dg +3 will be the brightest?

  02.21: An ideal battery, an ideal ammeter, a switch and three resistovra1- d z7d,foyl(okqb4 1fvd16/kbars are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 amperesfdk bl11z fd7-/ok6y d4va(qb o1r a,v.
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 three resistors are conn bkwq,t;i0c8d ected as shown. Wbkd;ctq0w, 8iith 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 resi* k ymg;(d8xom)mwvtkc92jg75v, lue stors are connected as shown. W5;7e 9c*mm8kw2(jv uoyvx l)m gkd,gtith 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?