16.09: In the circuit shown, an electric current exists in the metal nwm a)4ep5f1iresistor 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 pae 54mw if1)nelectric field through the interior of the resistor?

  98.06: When any four resistors are connectt7mtu b(q8r+cedag3k wvb*d2 dx;+6jed in parallel, the_________each resist7wud8ttr 3 j xvme*+62; gbb +dakdqc(or is the same.

  06.33: A current through the thin filament wire of a lightbulb causes the filam /n x*y8yck0tbent to become white 0cbn yytxk/ *8hot, while the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are being reps/ww +q ;9+6 4lcgk vniwoc(l nt)rcd;laced with LEDs. LED is the acronym for which one of the followwd9 iwn(wvcs/rc +4 ok;lc+) lgq n6;ting choices?

  05.16: A cylindrical graphite resistor h1m, x cw: haf0jx1ec.kas 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 cylindrwe a1k.h,x j 10ccm:xfical resistor?

  98.20: Wire I and wire II are made of the same material. Wire Io,n6gs 3uo 4.ptnjb7w qt1jd6I has twice the diameter and twice the length of I. If I has resistancejbswntouj1q7pd4 n,o3 .66 g t R, II has resistance

  99.31: Wire Y is made of the same material but has twice the diamh+3 0y lsg+q)tp/wpsz1bh(j feter and half the length of wire X. If wi wl03g1q (py)+jhsfzs b htp/+re X has a resistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L aqa r* g tun (2nljm(d5(en,)rrx ija)nr;j71snd radius r. This piece of material is then drawn so that it is a cylinder with new snr ;1luig xqarjn(me 2jjar,t)*n nd7(r5 ()length 2L. What happens to the resistance of this material because of this process?

  07.27: A junior Thomas Edison wants to make a br6k zl.vkwme 84ighter light bulb. He decides to modify the filament. How should the filament of a lightbulb be mozl. 86kwe kvm4dified in order to make the lightbulb produce more light at a given voltage?

  16.07: Three cylindrical resistors a0y3:y/sgq em1wja2s vw* m9txre made of the same material. The length and radius of each resistor isesmsa/ tg1 yy* :jv3mwqxw92 0:
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 con g zx4 :q+0udp;fj-ju/xhm0gxnected 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 ;gdjxzg/0h:4u xj fqpum-x0 +resistors is connected in series to a fourth resistor.” What is the equivalent resistance of this arrangement of four resistors?

  95.35: The voltmeter iw* uy ri1 ;+b pb5sqkv7,0ohypn the accompanying circuit diagram has internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter i5srk0uyb opq;*+ ,w1 bp hyv7reading is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circ2x0, y0v h5zachev ,lxuit shown to the right. The three bulbs 1, 2, and 3 - represented as resistors in the 2x0 5hcvx,a, ehlzvy0diagram
- 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 simpla59(-(vqp:z6 w bk 1avj-mrmlbws1k ce electrical circuit at the right. If the current in all three resik v 9wsmzakq6-jwv1bp(5:mcr (- l1a bstors is equal, which of the following statements must be true?

  99.37: The diagram at righcx * a.1 4aqk3vlmcz9it represents a simple electric circuit composed of 5 identical light bulbs and 2 flashlight cells. Wh.14zcmcq kva *9i3xal ich bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statemenvcj7 *2- jrzvg- 6n1z0o pnnmots is NOT true concerning the simple circuit shown where resistors R1, R2 and R3 are jg1rnz j0m- op7v nc6 -vn*oz2have equal resistances?

  17.29: Two lightbulbs X andY are connected ibi;y xve qy2dys42*h+n series 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 other to the same battery, which one of the f y 2s2+; hvyqi4*eyxbdollowing choices best represents what is observed?

  06.34: How many coulombs will pass through thx .gv81 1wkc) 4miesq/lmb v/r*p)xfbe identified resistor in 5 seconds once the circuit was closebf) 4w rxesbkpvc//11ilm8*xv.) qmgd?

  00.23: If all of the resistors in the *gmixev.y x,9: ,, 9h owbb(cgc9br mr following simple circuit have the same resistance, which would dissipate b(icr x,v or,:mx ecb*mw.9,g9gyhb9the greatest power?

  98.34: In the accompanying circuit d;y)agivx06vf 2x iet1 s 7nxs.iagram, the current through the 6.0 Ω resistor ii yev n0xx2ts) fig1v;a.s76xs 1.0 A. What is the power supply voltage V?

  97.27: Three resistors R1, oz7yx 7vhba *qqj5 m80R2, and R3 are connected in series to a battery. Suppos8yz0 jax7 b5* m7oqqhve 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 R3?

  99.40: Three different resistor7/q wr*fyn, dbyztai e3 qs2*1s R1, R2 andR3 are connected in parallel to a battery. Suppose Rtqzw*d3ae s 2iy/1rbqyf 7 n,*1 has 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 tr5:)th peaqa;yl7o-q1y-cj ghe maximum vl:aa;-yy 7g e pt-rq)hq1o5c jalue of the current under these conditions?

  99.23: What is the resistance of a 60 watt lightbulb designed to opej,t gox+a+/yb rate at 120 voja+y o+ g,/tbxlts?

  03.09: How much current flows through a 4 ohm resistor that is det,n ,xuawg 05issipating 36 watts of powen ,0 xuta,ew5gr?

  05.21: A household iron used to press ngalhwlw5v6ndwe; +64a+v *pv bx2: xclothes is marked "120 volt, 600 watt.” In normal use, the current i4vga6+:nlvw ; +naxdw *hp6w5 ex lbv2n it is

  01.05: Which of the following resistances could NOT be produced by a circuitg /2xv5;h;blbs 7t d3p4txrx*9nkbt v containing only three identic tv*;hbb4n37; gx dspxx5ltvt2bkr / 9al 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of the following equivalenn+xi-kn3( (h bkt8nt rt resistances CANNOT be producei(k -txn8h3k+brn( tn d using all three resistors?

  02.06: Three resistors of different value k1kx5wjq+6u h pw04ios can be connected together in different configurations. If all three resistors are used in a circuit, how mak hj6q 04i+1wpuw o5xkny different values of total resistance can be produced?

  97.35: When a single resistor is connected to a battei.v9v;m50xt ca s nj-snp4ni) ry, a total power P is dissipated in the circuit. How much total power is dissipated in a circuit if n identical resistors are connected i; -jsm 0v4inc9.i5p tnasn) vxn series using the same battery? Assume the internal resistance of the battery is zero.

  96.16: When two resist 7lks05/1n cpa0clauczw .nx-ors, having resistance R1 and R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the following statements about las0a/-w15kx u7.npnzl cc0c the resistances is correct?

  02.46: A hotplate is designed such that it has a resistawm* o- myw++yg2c pd)ence of 12Ω when operating at 120 volts. What is the minimum a 2 p-)e m+wmd+g*yyowcmount 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 disvpmejn3 oe7 ka/wx2, 9sipating 36 watts of pow/2, 3xvmkp7n eja9 oweer?

  01.24: An electric heater draws 13 ampere-(b3epy55r 9xat *ajnt.jfj ms of current when connected to 120 volts. If the price of electricity iyftjjt3jx*.nb-9ara pe5 ( 5m s $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 ligh* zrmg+ -mzcpoc+9c2qtbulb lit continuously for 1 year amgz rm zc2-9qccp*+o+t a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb results ine(thgg5p 9pa. 5+ mugp a power of 24.0 W associated with the bulb. Which one of the following choices best represegpppugh 9.+5( gtma5e nts the resistance of the lightbulb?

  01.10: Each member of a family of six owns a comput5;kpw5x.ldkh:njx2s 1 ea+ h yer 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 is2jkspl .5 hwhdx n1+ykea 5;:x the maximum number of the computers can be operating at the sametime?

  03.16: A 9-volt battery is connected to four r;a(nhlovo t-jms2;vi.kp ,; sf62hb qesistors to form a simple circuit as sah; lvs;q2jtnf ,6v. shm; bk(op2-oi hown 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 simp oo; jys:s31gjle circuit as shown to the ri1 ojys;jog3: sght.
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 resiey( qx3;*xzdzstors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes.xqzz xe d*y(;3
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 andzc9 o3vm1l x)bai:k l.h7 ;hjz three resistors are connected as shown. With the switch open as shown in the dizzl)l;hk93vx j.mh71 iab:c o agram 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 adbam,x )jdeh( nk/t6z e, - )98obgkodmmeter, a switch and three resistors are connected as shown.9dk6e,j to8gbb))a(,hmk- nzod /de x 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 shou i-cw,9vj*cg wn to the right, what is the equivalent resistance? Assume that all wires are iu9v,g j- *cicwdeal, the battery has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent agp )d4a *z,bplu7 g(wj( z6g. dfh2dtx4 e2pjresistance of the circuit shown to the right with resistancap 6 e(4)b *au(j2xdgf gt zw2zphjp4d 7,.gldes $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows 2qragui/s 1g )five identical resistors connected in a combination series and parallel circuit to a voltairsag)qu2 1/ gge source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resistors conybb lrzgi.t)62,(cw:0 ucdur nected in a combination sedzlt2ugrcr )6 i:b (.bu,wy0cries and 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 bu u,7n a4ji51gwuwx0nolbs are identical. Which bulb willnioa7ww5, u xug41j n0 be the brightest?

  02.21: An ideal battery, an ideal ammeter, a switch and three resistors are c59 t ,dp 6jqupnb)0jd9etu .eeonnected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 am56tuepujn. qd)jbe, pd9e09tperes.
With the switch open, what would be the potential difference across the 15 ohm resistor?

  02.22: An ideal battew flrg1o/+f g0ry, an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 ampw1fo +lfg 0gr/eres.
With the switch open, what must be the voltage supplied by the battery?

  02.23: An ideal battery, an ideal ammeter, a switch and*2y- cuck6hfu0jk9sqx e5ez2 three resistors are connected as shown. With the switch open as shown in the d u9e 2 q5j0yhkzcsk*xu 2cf6-eiagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?