16.09: In the circuit shown, an electric curre)8rm v 3 b3leq)-jg kzwn+d9fwnt exists in the metal resistor connected to the battery. Which one of the following choices best describes the direction of electron flow through the resistor and the directiong3dwl bvq)nf8me+ kz9j ) 3rw- of the electric field through the interior of the resistor?

  98.06: When any four resr 6jko6x/;p38u/0hefnw5ns hxox / qsistors are connected in parallel, the_________each resistor is thew xh funshoq//68 3/ox;0xn 6erkj5ps same.

  06.33: A current through the thin filament wire of a lighep(xx*np56d*dx6f oj tbulb causes the filament to become whiex*56nfdop j* dp( 6xxte hot, while the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard househol 3nujc/(rect-ljtq2(c4 5vvsd lights are being replaced with LEDs. LED is the acronym for which one of the following chocqet(n-2j53 c(vvlur4j/ ct sices?

  05.16: A cylindrical graphowa k),3z*hii ite resistor has length L and cross-sectional area A. It is to be placzi)aihk *, o3wed 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 resistor?

  98.20: Wire I and wire II are made of the same materi y8 mi+utsp jui5ro2j-+cf)e0al. Wire II has twice the diameter and twice the length of I.s 0ru+yj8- if+o)it5j2 epcmu If I has resistance R, II has resistance

  99.31: Wire Y is made of the same materialz/y:ac mk30vf but has twice the diameter and half the length of wire X. If wire X hac/fkvy 03:az ms a resistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and radius r. Th 6quh3w-nvk:/ ovm )stis piece of material is then drawn so that it is a cylinder with new length 2L. What hap/o) vt3hvks6 :num-wq pens to the resistance of this material because of this process?

  07.27: A junior Thomas Edi(pqamrp4 rh9:529oywc iy *w lson wants to make a brighter light bulb. He decides to modify the filament. How should the filament of a lightbulb be modified in order to make the c lwy 9i294ampoy*:qr(rwhp5 lightbulb produce more light at a given voltage?

  16.07: Three cylindrical (id -*ln3ql7kqcr5 ihwda*4u resistors are made of the same material. The length and radius of each rh4*qd3(7r c* ia ikuqwlld -5nesistor 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 connectedmoh*r5 e8-gbbzhz qd* f47np0 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 serr7b 5hz8 ngdfqzm 04bho- p**eies 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 resistance vrwwj*l:vv u.k:+) jc 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The volt:) ulk. :jv cj*ww+rvvmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. The three bulbs 1(n /gu:r ujob+, 2, and 3 uu(+nbro j:g/- 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 simpl te9hxj77*sb/qn;y n /vyy ue+e electrical circuit at the right. If the current in all three resistors is equal, which obn7s t/*nqxvej7e yy ;y+/9hu f the following statements must be true?

  99.37: The diagram at5y 4;pam)xtrrqi-w5 1nhb j )y right represents a simple electric circuit composed of 5 identical light bulbswp; xqiry jmn b) 5ahtyr154-) and 2 flashlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NO+.ja7y bl.p t9epvye:dnk24e T true concerning the simple circuit shown where resistors R1, R2 and R3 are hakl2e t: +dnbev 7.ay9p.jey 4pve equal resistances?

  17.29: Two lightbulbs X andY are connectedh il/:5 sui3nh e/b;sj in series to a battery. Bulb X is brighter than bulb Y. Assume all circuit elements are ideal. If bulbs X andY are cs;b5u jle s3ii//hh:nonnected 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 thenzc7vbncgmz: (kd 53ltq6utc3*9z + u identified resistor in 5 seconds b g*3vu(nzukznd3t l7+m9: qc t6ccz5once the circuit was closed?

  00.23: If all of the resistors in the following simpe f-eqvmmv3m6kqht ug0+*x/ :le circuit have the same resistance, which would dissipate e+ug-6 :mq hmmtk3 v0xefvq/*the greatest power?

  98.34: In the accompanying ht/w) bpzeamc15e43e 5ry6zah 4kl az m+) km7circuit diagram, the current through the 6.0 Ω resistor is 1.ak+et6 yz)ezc54m 1 rm k hz35lba 4ap/wem)7h0 A. What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are cvayi(18uho.m2kae ,mbd7z3s+z u1 bconnected in series to a battery. Suppose R1 carries a current of 2.0 A, R2 has a re b+smkyz.7e3 ,dai(obuh1zcu 8avm1 2sistance of 3.0Ω, and R3 dissipates 6.0 W of power. What is the voltage across R3?

  99.40: Three different resis yl e4zbqw5wvn-e1y.j,o9b8gtors R1, R2 andR3 are connected in parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipatn-el y,q5j1yw94b o wg. 8vzbees 6 W. What is the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is the maximi1t sz8p r.*ecum value of the currenct1z.ei*r8s p t under these conditions?

  99.23: What is the resistancecw8uj7 mqkmt0n0x;) v of a 60 watt lightbulb designed to operate at 120 vox 7uwvnj;)t0m0qk8 cmlts?

  03.09: How much curre-jnoh m:xq(jm/fb. w 2nt flows through a 4 ohm resistor that is dissipating 36 watts b:oq mnm.2- /h w(fxjjof power?

  05.21: A household iron used g bksit;ct*9 :56 s3fbcgi;di to press clothes is marked "120 volt, 600 watt.” In normal use, the currenticbgkifb*56; 9 s; idg:3tcts in it is

  01.05: Which of the following resistances could NOT be produced by a circuile b 7ley1)ga/ 2jx k vo+vy+j+jg39q3a0obirt containingl03j2eo+axj l+ vqob+ ra7y i/jb1)3gv9key g only three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resistors. Which of thez5*ayr j0 q,ksetu12x following equivalent resistances CANNjke 2 asx10y*uq5 r,tzOT be produced using all three resistors?

  02.06: Three resistors of -.emqct* x3ijfjba3 06.abjmdifferent values can be connected together in different configurations. If all three resistorf b0c *mmaje6t.. j-axjqb3i3s 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 power P ijro*v3+:d5s1+xmb2p3qb fmwlyd 1y)au 2pk e s dissipated in the circuit. How much total power is dissipated in a circuit if n iyj3kmd1ov+bpdfrxm: ap q12+32b*swe )yu 5ldentical 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, are connected in9,2mn (;t-va8zdc4hx llx tan parallel, the equivalent resistance of the combination is 5Ω . Wh4hx 9l vam-nc (l,dn2 xzat;8tich of the following statements about the resistances is correct?

  02.46: A hotplate is designed such that it b687+r: n (+uwor kxi: l t(hrkqycirtm,6.dr has a resistance of 12Ω when operating at 120 volts. What is the minimhn+ rmyl c((t q7xkrowt +ru brrid:6.,:8k6ium 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 dissipanvz+ri 9kax.-rr ld)1b(4s arting 36 wat r)4 r.a1dzr+ -(9vsia lnxbrkts of power?

  01.24: An electric heater draws 13 a x6mycyv6 h0 aup72z:vmperes of current when connected to 120 volts. Ic2 uv0m6yvapy z:x7h6f 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 muhk9 vh16uqw ftz(0y; qch would it cost to keep a 100W lightbulb lit continuously61tzq;fy0qv hkw(9 uh for 1 year at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through a lightbulb resultm.b+ *8xd9fg d7vdnwds in a power of 24.0 W associated with thbd.mwv d 8g+d7d9*f nxe 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 computer rc9 448+4bdjt gjqusizated 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 computers can be s ijq94t+44j8bgc udz operating at the sametime?

  03.16: A 9-volt battery is connect yq(; uxdy5-. 5smuhkyed to four resistors to form a simple circuit y u (dmyq.s yukh-;55xas 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 connected to four resistors to form a simple circw,v4 + .w3er59xl +lxb bexndkuit as shown to the right. .r5l xx+vn kledwex94b3 +wb,
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 resisto(/h+ jn42brsil 7wvzxd. /ezirs are connected as shown. With the switch open aejb vzh4 /i2d.i z(lr s/7wnx+s 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 ammetejt2-4rnn s soq(6r9bzr, a switch and three resistors are connected as shown. With the switch open anr4-rq(j9oz6tb sn s 2s 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 switc.ohpbb0t dx() s 9jkp4h and three resistors are connected as shown. With the switch open as shown in thek)h49(tb xob 0pd.pjs 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 right, what is the dmp t/gu .x78cequivalent resistance? Assume that all wires are ideal, thg.d c/x8mt7up e battery has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of the circuit shown to 0.gvhz 9/khkm the right with resistanc /vkzmh9hk .g0es $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five idenhbe0i a1,s7 2jndzo1 ztical resistors connected in a combination series and parallel circuit,ez02di1jnzso a hb17 to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical rer 91mx/um ci/lbci+k .sistors connected in a combination series and parallel circuit to a v1+mukx iic c9./rl mb/oltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram, all of the bulbs are identical. Whichhd.h f ikz.)0-3oa6mfev,4xaz sexyw 3z 64cv bulb will b0 fcmi 6dh .4)ke,zyva z4fo3vsw- 6e ax.3hxze the brightest?

  02.21: An ideal battery, an ideal ammta( a om.y 0j:p3 x0 l5*temwva,2tproeter, a switch and three resistors are connected ast:rawp0 y(tj a,20m 3.x* l5vopoetma shown. With the switch open 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 battg zk il nhx ke+8awm5+9rrr1,-ery, an ideal ammeter, a switch and three resistors are connected as sh++ ,irkna58rl9zrw exgm-hk 1own. With 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,/a+,5y t kjthn an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagraj+thka, /n 5tym the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?