16.09: In the circuitnsys2.t3 je a2 shown, an electric current exists in the metal resistor connected to the battery. Which one of the followins3 tn.s22ae jyg 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 paralhu-9 f v 9tghvku/cwczlw8 )/4lel, the_________each resistor is the samekf8hu94l /vw)h/uc tczwv9- g .

  06.33: A current through the thin filament wire of a lightbulu*w x zxn7hbn)y s/)qt5 j/3m x4guvf:b causes the filament to become white hot, while /u7xj5y)nun mz 4/:vb)xfw3 tgsqxh *the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are being/ qa1ms-s8veq3zjnz b tfl3 hz/dar4 mn4;:/i replaced with LEDs. LED is the acronym for which one/3mzs4-qqf ihaa;s:r /mnl b 81n4/3vtjzdze of the following choices?

  05.16: A cylindrical graphite resistor has length L and vyiq(*xx.xq)u3 ypzo* mdet* p2p2j7cross-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 thypp.vpqxtoq i2**x2z) *(7myeujxd 3e ratio of the new resistivity to the old resistivity of the cylindrical resistor?

  98.20: Wire I and wire Ilzwciikh p7q )z7 (vlbn31a:8 I are made of the same material. Wire II has twice the diameter z :p l ln771b8ki(a3hvqzw)c iand twice the length of I. If I has resistance R, II has resistance

  99.31: Wire Y is mades1fzv f *26)fby 0u)9(ekpk8clqx;gx5qxbd k of the same material but has twice the diameter and half the length of wire X. If wire X has a resistance of R then wirxe9qqzxf y x ;8 bk6* 25u)p(bckfd0s1kfg)vle Y would have a resistance of

  03.23: A cylindricalt8m vi-r;zc3d resistor has length L and radius r. This piece of material is then drawn so that it is a cylinder with new length 2 c-3 8;rzidtmvL. What happens to the resistance of this material because of this process?

  07.27: A junior Thomas Edison wants i6k2sa q8c2qo fgq3e2to make a brighter light bulb. He decides to modify the filament. 36 e k8222 qqofcsgiaqHow 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 resistk47vj9viv5 )sgea/p,i q u ctl0xn:*mors are made of the same material. The length and radius of each resistor 4sn0kv9: exi7/gv5t,a ql*v) icpjumis:
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 connected to a battery innlc,/ 1j(u 0d8:p,dkprh4 t6l kzbdry the following way: “Two resist :zd8 d(b4ck p6lrkdryj pt0 /,hnlu1,ors 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 circuit diagram has internal resistasvo4 ,s8k:rzc nce 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 k,srs:co4 zv8mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. The ue kygh jtt0x h.mfm+ + 2k0ir)72if3jthree bulbs 1, 2, and 3 - represented as resisto mjrhfii0 +tj yh)t. mf7gk2k3ue2x0+rs 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. If the curre ix.s(7b aj ;ojgzt;7dnt in all three resistors is equal, which of the following statements must be true?7ja7;.ixd;bz g o s(tj

  99.37: The diagram at right represents a simple electric circuit clf)dv.jb ysh:c5bqi jajj1q6c.e),0omposed of 5 identical light bulbs and 2 flashlight cells. Which bulb (jf.,j)6)q0 q sdba lcj hyibe. jcv:51or bulbs)
would you expect to be the brightest?

  00.03: Which of the following a3;zo 2i* 7ak 0mx9,emjxawhcstatements is NOT true concerning the simple circuit shown where resistors R1, R2 andame h a27 oxak;90*3,izmcxwj R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series to a batterr*z78u1ch vt uy. Bulb X is brighter than bulb Y. Assume all circuit elements are ideal. If bulbs X andY are connected in parallel with each othetv1hru*zc 7u8 r to the same battery, which one of the following choices best represents what is observed?

  06.34: How many coulombs will pass thrb fnnp:;g. sm2 *uq o vuze26)9nf:urvough the identified resistor in 5 seconds oncevve2snu f:q fr:ngzo6pbmn u*29.)u; the circuit was closed?

  00.23: If all of the resistors in the following s (2ypf +mrm)+sizn8zlimple circuit have the same resistance, which would dissipate the greatest pi) ysmzp+mz82 fr (nl+ower?

  98.34: In the accompanying afe+)*qvi raz, c8c+hj mp)8jcircuit diagram, the current through the 6.0 Ω resistor is 1jfi)a+,jh a)cv+*qrze mp88c.0 A. What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected in series to a battery.n6pmxf)lf.zhcg 3 bt* ;2zcl - Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissipates 6.0 W of powercmp)h l2 tbz ;nxc6f .3lf-gz*. What is the voltage across R3?

  99.40: Three differecs y4p2ddmy03 nt resistors R1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2py20dysm c 43d = 4Ω, and R3 dissipates 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts andbki i7vn 8ip538,fw;w hh7mgm 120 volts. What is the maximum value of the current under the 3ibwm87i i pmkng,;5fhv8wh7se conditions?

  99.23: What is the resistance of a 60 waba4 bdcd05,ui4 z1us itt lightbulb designed to operate at 120 volts?ic0ds4b51bd z4iu u,a

  03.09: How much current flows through a 4 ohm 43gqvhm* n se;pu.nk-resistor that is dissipating 36 watts of power?vh4 mku gep nn3q;*.s-

  05.21: A household iron used to press clothes is marked "120 volt, 600 watl(o5e rl6ycp3a; -m 3kvlv:oo1y4jm;sl p) qdt.” In normal use, the4ml orkl 5ae 3vlq-oy ;o m;cy plpdvsj16():3 current in it is

  01.05: Which of the following resistances could NOT be producetvn/zo+pn+y 7r3 b3 axd by a circuit containing only tnb+7y / tapor+xvnz33hree identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of the foqucl-.8cfj bs+5x8 ux llowing equivalent resistances CANNOT be produced usingq5fl.xc +8jxb uc -s8u all three resistors?

  02.06: Three resistors ofxw : hfbt3glmz+a.- +b different values can be connected together in different configurations. If all ta:zt fmb-h +b3+lg x.whree 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 batterto (ejnaq;3 8hy, a total power P is dissipated in the 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 theae hot(3jqn8 ; battery is zero.

  96.16: When two resistors4r ie/9rshb 4why 0c i/bc9((zv 8imph, having resistance R1 and R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Wzhbe4 89 r( hi0cwm b4/9v/csry( hpiihich of the following statements about the resistances is correct?

  02.46: A hotplate is des es,87 axnuuc1*jdm* xigned such that it has a resistance of 12Ω when operating at 120 voltm cxuj *u naed,*71sx8s. 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 dissipatin1g5qyu6eiv uv6a /) mfg 36 wagiv65e ufq/vm6 )a1 yutts of power?

  01.24: An electric heater da- 0g 7 ieeo9rj5fo.qtraws 13 amperes of current when connected to 120 volts. If the pricq7regje f-o i5a09ot.e of electricity is $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately how much3q3hy ,wn 4bwd would it cost to keep a 100W lightbulb lit continuously for 1 yeaq4nw, hy3 wb3dr at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results in a power n9.*f. cnzava /)gk t.ifo8zq8et hb-of 24.0 W associated with the n8vebf z8 c 9a*hkt-oq.n.ti /).fg azbulb. Which one of the following choices best represents the resistance of the lightbulb?

  01.10: Each member of a family of six owns a computer 4(ik8at uf j018kzcan rated at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protecte iu84k z1aakc(0tj8fnd 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 resi m- y-o7l+u +vqzv3mvvstors to form a simple circuit as shown to the right.vvo vmm+u z3 7+yl-v-q
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 resistorsxp ong:d (fda-(ykf ); to form a simple circuit as sh-ofdd;pakn )(fyg(:x own 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 resistors are conn+eiki s)tf bws oha,3+nsa5(3ected as shown. With the switch (t,e3a5+sb3 s)w+sik fai ohnopen 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 switch2m-ui z/e ya6c and three resistors are connected as shown. With the switch open as shown in the diagram the amme2m6/u a czy-ieter reads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battery, an ideal a:o:-eosxvs 5 pmmeter, a switch and three resistors are connected as ssx:-5eso o vp:hown. 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?

  12.14: For the circuit shown to the qi03fob z:oxl z:qz1,right, what is the equivalent resistance? Assume that all wires are ideal, the battery has no internal resistance, and all three resistors have identical resistazzf3qo: 01bo :,zil xqnce R.

  09.07: The equivalent re 4hgg7ay+ kcov+;fuj 7sistance of the circuit shown to the right with resistanc;fva+o j47 h+g7uk gcyes $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors connectecc:u d) oyr* h3)np snka8g5s6d in a combination series and parallel circuit tsh6apsoc 8)*3n5:) urcydgk no a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resis9 yf:4 1jevnrk b3+vwztors connected in a combination series and paralv 1ynk9+:4 fjb3 erzvwlel circuit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the b j*okcdt:- w (wy z5*3zagofk6ulbs are identical. Which bulb :- 5kj3gyz(*t d*owaf owkc6 zwill be the brightest?

  02.21: An ideal battery, an ideal ammeter, a switch and bfxvndn-u3z: uc,vyu 7 6)n4d three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 ampe cn7n3 z4v-b: )ynvu6f,duuxdres.
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battery, an ideamxn3eo3bi0 to(9 ek. yqpd4 f6l ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammetee oxp03.mndtbe k6q93 f(y o4ir 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 ayljdq/buerp - :o. (/bre connected as shown. With the switch opej:o(.qupylr d b//b- en as shown in the diagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?