16.09: In the circuit shown, an electric current exists in the metal resistor)lo1c lkh2 *gmh .acs5 connected to the battery. Which one of the following choices best describes the direction of electron flow through the resistor and the direction of the electrh5alhc*2lo )c .1ms kgic field through the interior of the resistor?

  98.06: When any four resistors are:wfp 3 fv/6o1qch-o5e yj.ah wnn, ats90oy6k connected in parallel, the_________each resistor i1onw ,vcatesf-q :5a0.3wf6hy hjy9k/oo np 6s the same.

  06.33: A current through the thin filament wire of a lightbulb causes ykos:wo;*ez s /*xm4v the filament to become white hot, while the larger wires connected to the lightbv*m :ow /y*zxesks4o;ulb remain much cooler. This happens because

  13.08: Some standard household lights x3iocs +7x6lx.jl+ljdt 9 oj5are being replaced with LEDs. LED is the acronym for which one of the following choices7jstocx 3ljjdx6.l l+ox9 i5+ ?

  05.16: A cylindrical graphite h.gzjskp8rg),fq9matj) 45y resistor 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 resistivity to the old resistivity of the cylindrical m)zaq4,) jtgjyh95s8 gkrfp .resistor?

  98.20: Wire I and wire II are made of the same material. Wire I99e c;p;jk 7b d7ddev+s5 qpnuI has twice the diameter and twice the length of I. If p udp; cejdde995v k7qb;+7s nI has resistance R, II has resistance

  99.31: Wire Y is made of the same material but has tg:*; g d0(noyzz dec:lwice the diameter and half the length of wire X. If wire X has a resistance of R then wire Y would have a resist dz:(dcye zg o:g;n*0lance of

  03.23: A cylindrical resistor has length L and radius r. This piece of materiowb5uy:w 6c4 q1p* a9mpoz -saal is then drawn so that it is a cylinder with new length 2L. What happens to the rescw:y6pb 4 o 1uz5m-9 osawpq*aistance of this material because of this process?

  07.27: A junior Thomas Edison wants to make a brighter light d tp3 - v-5jir3wppvmr(4q;f2gtkv d1bulb. He decides to modify the filament. How should the filament of a lightbulb be modified in order to make the lightbulb (k vmgrr2 pfp 3 jptqw34t;15vv-d-id produce more light at a given voltage?

  16.07: Three cylindrical resistors are made of the same materi) mdc0y i l:km-9+m(rdf (sgrual. The length and radius of f( u:sm +rdgkl-ri0 )mycm9(deach 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 ofp +xp2b;+ooy ;ms1um7nncsox nn 0c,8 resistance R, are connected to a battery in the fol1o;mpnbpn+uc;sm0c2n 8 ,+xo yo7 nxs lowing 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 arrangement of four resistors?

  95.35: The voltmeter in the accompanying circui+e2g29te bcc ,d5yk usqpa+z2cl.2h t t diagram has internal resistance 10.0 kW and the ammeter has internal resistance 25.0 oh2+slz. ,peb d u+ 925h22ckccgqta yetm. The ammeter reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. The three kkg)7s+7ykf d bulbs 1, 2, and 3 - represented as resist7fk d +gsk)ky7ors 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. I0xeo xy1 a(w5yf the current in all three resistors is equal, which of the following statements must be trueyo1 5xewy 0x(a?

  99.37: The diagram at right represents a simple electjicb--o9aky+xvb e;( ric circuit composed of 5 identical light bulbs and 2 flashligh-x (ck-oe+ 9jbb aiv;yt cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOnc* pxp*7y/ctlw 4e2gT true concerning the simple circuit shown where resistors R1, R2 and R3 are have equal resistancec/*wpy gnep2x4l*tc 7s?

  17.29: Two lightbulbs X andY are connected in series to a battery. Burgxw 5xv-f7;dkpn.d 8lb X is brighter than bulb Y. Assume all circuit elements are ideal. If bulbs X andY arvr dndp .xgkxw75f;- 8e 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 ide lt6zgf/j -cw57nzc ,vntified resistor in 5 seconds cwz g fzjl-n/7ctv 65, once the circuit was closed?

  00.23: If all of t 32 dzj)ohf)eghe resistors in the following simple circuit have the same resistance, which would dissipate) ejgh2)3zo fd the greatest power?

  98.34: In the accompanying cirhm jp-t2* np 8p88qtnhcuit diagram, the current through the 6.0 Ω resistor is 1.0 A. What is the 2*8ptnq-jhpt m p8nh 8power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected in series t9t;xw5h se8 n6av7n1zvem9t oo a battery. Suppose R1 carries a current of 2.0 A, R2 has a resntvw ax oe7ht 1sve68 z5m9n;9istance of 3.0Ω, and R3 dissipates 6.0 W of power. What is the voltage across R3?

  99.40: Three different rz* jk,4dib,+difs s 94xgkag 3esistors R1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipateik fdkg9si*d 4,4,+gxszja3b s 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is the -+cuve9on7x3y rnr1w maximum valu+n ru w39-vxy17oern ce of the current under these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designed to operate a8m pwagwoo)f/ y7*9hzt 120 voltsa)o *gwpzm8o/w7y9f h?

  03.09: How much current flows through a 4 ge1f rve:f ..d2:mzpo ohm resistor that is dissipating 36 watts odfeom g:.1rzv.p: e2ff power?

  05.21: A household iron used tlcdlz 0/+ e6kx 0dqpe (et11gzo press clothes is marked "120 volt, 600 watt.” In normal use, the curg/l(0zpce 0q l+kxdtz e1de16rent in it is

  01.05: Which of the following resistances could NOT n7h wp1,qzu-n d4t/r9flem/jbe produced by a circuit containien9ztp ,/f7du4/w r1 lhqj -mnng only three identical 6Ω resistors?

  94.37: You are given three 1.0 m/x4((f2pw md) yrlpc c0o f1lΩ resistors. Which of the following equivalent resistances CANNOT be produced using all three fp 24mcwr (p0dxylflmo c)1(/resistors?

  02.06: Three resistors of differ8wfi(9 ohaljl1/o5x1ok y o(f ent values can be connected together in different configurations. If1x/ hff wolji9o8olo1ya(( 5k all three 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 batteryxt: 5i vpgv,,tpr9ussp/k 1bo6 k,4ch, a total power P is dissipated in the ,so,/v,:tc stpgxih5p194 p brkv6kucircuit. How much total 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 resistance R1 and R2, ard)uw 7f.p5 ydbe connected in parallel, the equivalent resistance of the combination is 5Ω . Which of thpfw).dy5 dbu7e following statements about the resistances is correct?

  02.46: A hotplate is designed such that it has a resistance of 12Ω whend+m8 ./3hn2nsc 8 oirzf. 4ccbfduim0 operating at 3zc0/cbrd osnmf.2icf4md i88+nhu. 120 volts. 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 is dissipating 39rtl+h+) jsq :4ur0-cut nnvj6 watts ofsn)4njclrjv+-r u0+t hq:9ut power?

  01.24: An electric heater draws 13 amperes of current whe1ut7a-c fifd 72jb y9hw5mk x7n connected to 120 volts. If the 1m7kbfj7f 9thduy7wc 5xi2a- 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 to keyd8ykrmd 4 -vmd)m- n0(gfrf *ep a 100W lightbulb lit continuously for 1 year at a rate fm-v)0ddfr(ky m8nmr4-g y *dof $0.10/(kW.hr) ?

  12.09: A constant current of (6ovjrk:qkn 74.00 A through a lightbulb results in a power of 24.0 W associated with the bulb. Which one of the following choices best represenk jqov(6r:n7k ts the resistance of the lightbulb?

  01.10: Each member of a family ong4spac0t4ws:hp 3x:)zr m 7rf six owns a computer rated at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit prpx as4 hr)3:gcs :7mpzw04nr totected 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 r4e80h5,r tuf3h:l ue, i4n-e p dyahkxesistors to form a simple circuit a8a4fe,x d:hn ku-i 40uhrp,ey35telhs 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 connectedx xkz 4t(pov;- to four resistors to form a simple circuit as sho(z xt p;v-kx4own 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 0qu hnq : ql)i6wtco)7ammeter, a switch and three resistors are connected as shown. With the switch opon :76 ql0cwhqut))iqen 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, a switch and three re,oz wj3ptp9v5z. .ovd sistors are connected as shown. With the switch open as show.o9jvd ,3z o tvpp.z5wn 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 resistors are cu7b4 o -raoo(fonnected as shown. With the switch open as shown in the diagram the ammet bu(of4o-a 7roer 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 rw-7/fc( c wo3n fuyq/oesistance? Assume that all wires are ideal, the baw- f7 3 ococn/fy/qw(uttery has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit shown to the right //pceo m7n i6 ftj5lx0 with resistanctxe/ j6 p/o n5im7l0cfes $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below ub z 76zfjjqfgk)/j4m)0) m2 st 6elwlshows five identical resistors connected in a combination series and parallel circuit to a voltage sourc s))wjl jzlj/7q6bk)fm04z6 fg 2t umee.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resis(rjrn jyd l5vi 20qa+5qm*fe-tors connected in a combination series andjd-+m lq y r5j( ni5rev*2fq0a 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 are identijljc5*t)v mdum 0iu,1cal. Which bulb will be the brightestlm0c*uti51djvmj),u ?

  02.21: An ideal battery, an ideal ammeter, a switch and three resistors are connttbvape7p gz.o k+h5 55jsg::ected as shown. With the switch opeg ap5z7+gv k :bht55.st ej:opn 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, a switch and three rh5j0qifdkfnsnt3(490k jz h- esistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 40tj( fjh0qnhid5-f3 nks9zk2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battery, an ideal ammeter, a a*fr/ 4ddjv71zh;h1xndfnl41jbz qq 5h)fs 6 switch and three resistors are connectl 1bdhx46r*qv nq ns 1)5/h dhjaf7 f;f1dzzj4ed as shown. 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?