16.09: In the circuit shown, an electric current exists in 9q)+krxjc1r0d9oa r t the metal resistor connected to the battery. Which one of the following choices ber 0 9 q)rx+9tkajodr1cst 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 parallel, t1 3ejizfmvvxo /2 jj22je*l ,che_________each resistor is the s j /v2 je,czmo21fxv*i jej23lame.

  06.33: A current through the thin filament wire of a lightbulb cau,6p h5m-cy wedses the filament to b 5 pm6-we,dchyecome white hot, while the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lvqwl;m5 wl6)q+* ,u pwqyb, 8tjs2 djdights are being replaced with LEDs. LED is the acronym fosd j+ wq,d,8pq qw5l;jw m )62*uyblvtr which one of the following choices?

  05.16: A cylindrical0 nhfj zn.0/mo aa-pr) graphite 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 nnhz 0pr m/ja)a0fo .-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 difap6- xalxa: /s4wcsqnv ) v3m7: )yviameter and twxxi)p/vavs)w:7v a-y ac3: 4l qfnsm6ice the length of I. If I has resistance R, II has resistance

  99.31: Wire Y is made of the same matk2- qy ly22m iwuwq7fz(x ;2owerial but has twice the diameter and half the length of wire X. If wire X has a resistance of R then wire Y would have a resisqqw;f iu m x-wz(ow22 y72l2kytance of

  03.23: A cylindrical rebg xc5j.wassc/j5:ueh7 .qf:sistor has length L 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 thisusce. 5::xjhbf/jwc s7.5 gqa material because of this process?

  07.27: A junior Thomas Edison wants to make a brighte s26 uq92vuo jnph;lt5r light bulb. He decides to modify t 2n t9jhp6; 5ulosqv2uhe 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 material.xbxgk,f5q.oz+ 8m1. rqa gm+ t The length and radi 5.8,. q+tmak+gmbo fxz1 qrxgus 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 resistancetfm-6wr,qw lj 4veuf 927anw( R, are connected to a battery in the following way: “Two resistors are connected in series. 2mu7f r,4v t 9wn-qe6fa(wjlw 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 circun2h+nq s s0gsj, vyc60it diagram has internal resistance 10.0 kW and the ammeter has internal resistavn6 s sn q0+,jc0gsh2ynce 25.0 ohm. 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 bulbs 1, 2kfe z4n(o( 1ux, and 3 - represented as re1n( ozk x4(ufesistors 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 electri/3() ogrv crg9vypq*h cal circuit at the right. If the current in all three resistors is equal, which of the following 9vh )vrg/op3 (qg*r ycstatements must be true?

  99.37: The diagram at right represents a1zp1eq f d0x.ahxhd (8 simple electric circuit composed of 5 identical li.8x(phfeq0ddha1 xz 1 ght bulbs and 2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following stateme. y av29m dcx( uvyjo)j25(bnynts is NOT true concerning the simple circuit shown where resistors R1, R2 and R3 are have equal resioy j .jv2( c52b(9 mnyayd)uxvstances?

  17.29: Two lightbulbs X andY are connected in ser9t xw5ihaf,j mpw1 56lies 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 othetwp,61h f w5xmij a5l9r to the same battery, which one of the following choices best represents what is observed?

  06.34: How many coulombs will pass through lkp/z 5:oz n03d-kypkthe identified resistor in 5 sekpnyo5p d-l0:zk k3/z conds once the circuit was closed?

  00.23: If all of the resistors in 7k k:m 7oba5ts the following simple circuit have the same resi t: 5bk7moask7stance, which would dissipate the greatest power?

  98.34: In the accompanying circuitdtiygd *(hg k*)g ,8ai diagram, the current through the 6.0 Ω resistor is 1.k dh)gg(y**ag8d, tii 0 A. What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected in series to a battery. Supp(badnn 7h-y( rose 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 across ((-nny ab hr7dR3?

  99.40: Three different resistors R1, R2 andR3 are ,/ swyikx(aoq0v vd+2 connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, vqw xovi0d s(a,/+yk2and R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is thrl mhfshd8- oyp j*;)8e maximum value of the current under these conditions m-8; oh*lj)sdry ph8f?

  99.23: What is the resistance of a 60 watt liglu *z*gcu 9u:6efwzz7 htbulb designed to operate at 120 vz** e lzzuu79:ufg c6wolts?

  03.09: How much current flows through a 4 ohm resistor that is dissipanl6nn9i s +tcib l(m8sczop5we6 6 1)qting 36 watts of plnn 6mqeli66p 1 s5t8swbni+zo() c9cower?

  05.21: A household iron used to press clothes is markxtnrzx*o/ewclic 3:03 +se+e ed "120 volt, 600 watt.” In normal use, the current i 3xwcrs++z 3le:/*o cix 0enetn it is

  01.05: Which of the following resistances could NOT be produced by a cpp0w +;q a2sk)ex dz3zlw8w8 8fncg p2ircuit containing only three identi c28ld wq828;kzpwpxsne3az+w gp) 0fcal 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of the following 3;ji)z )pw pbwequivalent resistances CANNOT be produced ;jw))p3ipbwz using all three resistors?

  02.06: Three resistors of different values can be connected together in d t:/bd b7c48nh lx(7x5hb jnzimh:ab 6ifferent configurations. If all three resistors are used in a ci( 6nb4hj/lbx t5nicah m z 77b:hd:bx8rcuit, how many different values of total resistance can be produced?

  97.35: When a single resistor is connected to a battery,l+p-ox)i(g lmg0yc ,r a total power P is dissipated in the,ggy(-)+r xcop0iml l circuit. 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, ar * 9w-kcrgan6y11tl 9pum.wxd e connected in parallel, the equivalent resistance of the combination is 5Ω . cng99-w updl6t1. k1yaxr* m wWhich of the following statements about the resistances is correct?

  02.46: A hotplate is designed such that it has a resistance of 12Ωtty+6,(i(pbpyz c vg ( when operating at 120 volts. What is the minimum amount of time that it would take to warm 0.45 kg of cptyg((pz (6iyt,+bv water from $15^{\circ}C$ to$85^{\circ}C$?

  03.09: How much current flows through a 4 oh j :3tma).m.vvgnqi-bm resistor that is dissipating 36 watts v. .3-qtn:vb jgamim) of power?

  01.24: An electric heater draws 13 amper/aw3yqr ih7 7.d,oo xxes of current when connected to 120 volts. If the price of electric7,a7 dyoo3hrx /q.i xwity 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 lit a(hx-b8 vm,c y)rbwo-:z tmg*p/1u sx continuously foo* m-yz,m- scp:avt/u(bx wg1r b)x8h r 1 year at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results in alwd +0-agpi0en0pwmje:o y 9(w en8h - power of 24.0 W associated witijpenw on09 ww0 pm8ly--d+ hga0e:e(h the bulb. Which one of the following choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a comput0s2(ne,xtg dgg hvw .3er rated at 500 watts in a 120 V circuit,g(vnw3 h0sgeg .tx 2d. 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 sametime?

  03.16: A 9-volt battery is connected to f( 4;c obouvu6xour resistors to form a simple circuit as shown to the rightbco4uov6 (x u;.
How would the current through the 2 ohm resistor compare to the current through the 4 ohm resistor?

  03.17: A 9-volt battery db,kfl 0h;dx9 is connected to four resistors to form a simple circuit as shk 9,xd0b;lf dhown 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 rb4n 8oanf8 f9i3wjc1z esistors are connected as shown. With the switch open as shown in the diagram the ammeter rff891z48 own c nbija3eads 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 threemx ak9zj2:b)m resistors are connected as shown. With the switch open as shown in t 9kb):mazjm2x he 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 7g g* yzr11t*rzrez9z ammeter, a switch and three resistors are connected as shown. With the s71*rry grzzz gt *1e9zwitch 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 thd n2 /w8hd1.xbf2fzup e right, what is the equivalent resistance? As1zpw8 .x /u d22nbfdfhsume that all wires are ideal, the battery has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit shown to theyvjr 5 vl/ nq1cy7 adwz);fm)o vkm(/1 right with resistanc/yv1ko)/ c;7 yf5mz q jwm1anrl v(vd)es $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors conneuzc fkt: j 0f cdgf,2-40taz9fcted in a combinatit0k cj f4fz0 -,g9zcdu taf2f:on series and parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram belo ge(8ct-u)u dfh2r5 ks)p6mp ib-)ckvw shows five identical resistors connected in a combination series and parallel circuit to a voktc2m5 -piseb c8r(pu u)h-d 6g))fvkltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs are identical. Which bul)x j cq17gp h:3q* 4vfrrdb-vjb will be the b):q1hqv-rvf x4*dj 3g bcp 7rjrightest?

  02.21: An ideal battery, an ideal ammeter, a switch and three resistors arbih4y4e/*uc,dnae 4 u e connected as shown. With the switch open as shown in the diagram 4he4 a,bud u*4ycnei/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, jjdphj u 484 l ej-l.vfgksuu29 u-d0,a switch and three resistors are connected as shown. uj2dgj0u vkh-9-4sp8j uelf dj4, u.lWith 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 batt,xxzl i/,m6vdjhqq7sjnop, t 60x- (h ery, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown i hj xxh,0msv l -q6qodnt,px(,i6j/z7n the diagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?