16.09: In the circuit shown, an electric current exists in the metal resist ctnysk 1 62xm..2mk7y h0fmkbor connected to the battery. Which one of the following choices best descc.m7tkmkh 210yyx.6 s 2fmnbkribes 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 resis toxc)7)c/zap tors are connected in parallel, the_________each resistor is thxz))ca/ p tco7e same.

  06.33: A current through the thin filament wire of a lightbulb causes the 9uoe fzs ksx1)ht (;pl -*,phgfilament to become weh) t x9phlz; (up-s*g1s ofk,hite hot, while the larger wires connected to the lightbulb remain much cooler. This happens because

  13.08: Some standard household lights are being replaced with LEDs. LED is the q xv(sdyk/q dfoz5615 acronym for which one of the fxfs1 od(v5q z/yq 56kdollowing choices?

  05.16: A cylindrical -jey.- ;df bo k0jn6mjgraphite 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 t- d6jy j0f-.bkm;o enjo the old resistivity of the cylindrical resistor?

  98.20: Wire I and wire I/t y:.w mhtu)z or,g2 .q2vdjro ;pthy*. :yypI are made of the same material. Wire II has twice the diameter and twice the length of I. If I has resistance R, h :*wvyz;thty .uyym:)2rj 2rogod/qptp,.. II has resistance

  99.31: Wire Y is made of the same material but has twice the diameter av m7zr .6e *nih4 ./uimwwqyg0nd half the length o .n*i67wrig.e 0mwmhq uv4y /zf wire X. If wire X has a resistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and l+dug (zmp /1hradius r. This piece of material i (/zmdp+u 1glhs then drawn so that it is a cylinder with new length 2L. What happens to the resistance of this material because of this process?

  07.27: A junior Thomas Edison wants to make a brighter light bulb. He dech:x* jhbpz j;*ides to modify the filament. How should the filament of a lip ;**bzhx:hjj ghtbulb 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. The le c),0aa)(gn*lr7i i 7ahtcv xclyqf7,ngth and ra*g ci r0aa ,lhya n))7xilfqc7,7c(tvdius 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, eac;e)zgma y31y lh of resistance R, are connected 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 series to a four 3y;eya) zmgl1th resistor.” What is the equivalent resistance of this arrangement of four resistors?

  95.35: The voltmeter in the accom50sdw :ebxv,-epukc : ,2p is 9uf0upipanying circuit diagram has internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter readics09s u2x up-e 5bv:d:, wk ii0epu,fpng is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuit shown to the right. The three bulbs 1, 2, fxjy-2 p.5pg pand 3 - represented as resistors5g px-fpy.j2p 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 current in1arv/cj .gv3 rz5ct0f all threecztrj35av1 0rfvg c ./ resistors is equal, which of the following statements must be true?

  99.37: The diagram at right represents a simple electric circuit i7bbm iw2q fc m: 2l;leut,i*-composed of 5 identical light bulbs and 2 flatqm, uie l:fwii2m- l;b*2bc7shlight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statements is NOT true concerning the si(3a1:ie r qv5t/ov zcbmple circuit shown where resistors R1, R2 and R3 arv ioct5/:e 1 zb(3qavre have equal resistances?

  17.29: Two lightbulbs X andY are conneq1gl:;g ;ucd x75 qrhqcted in 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 following choices best;; cqguhd 7lr1g5qq :x represents what is observed?

  06.34: How many coulombs will pass through the identified rgmt(pbf nlq9ej(7o ( /esistor in 5 seconds once the circuit was close ( lf/eobmg qn(p(j7t9d?

  00.23: If all of the resistors in the following simple circui-l(lwinur l341. boqk t have the same resistance, w lk .u(31ni 4llbwr-qohich would dissipate the greatest power?

  98.34: In the accompanying cipmf. rh(l:p p/rcuit diagram, the current through the 6.0 Ω resistor is 1.0 A. rfplh/( mp:p.What is the power supply voltage V?

  97.27: Three resistors R1, R2, and R3 r44-zys+st m iare connected in series to a battery. Suppose R1 carries a current of 2.0 A, R2 has a +i-4rm4tss zy resistance of 3.0Ω, and R3 dissipates 6.0 W of power. What is the voltage across R3?

  99.40: Three different resistors R1, R2 andR3 are connected /c9 0qtax:5 wn.h slrfin parallel to a battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. flr/0swc tn9a5qhx.: What is the current in R3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What 5dugjz6r :m3 yis the maximum value of the cu5mdguzy: j 63rrrent under these conditions?

  99.23: What is the resistance of a 7z(znm xp2ov8 60 watt lightbulb designed to operate at 120 volm( 287xv nzopzts?

  03.09: How much current flows through ir* wwl93(hdf a 4 ohm resistor that is dissipating 36 watts of power*h3 l9 (ridwwf?

  05.21: A household iron used to p3g 9vi .c5j2u2yso 0 r*ayn6pqo/kgem ress clothes is marked "120 volt, 600 watt.” In nog5o3 r/yypv2 usim.c *qj60k e92o ngarmal use, the current in it is

  01.05: Which of the following resistances could NOT be produced by abj2. .pe 0zoy2g5btqny 53jz g circuit con3gj5o. zb2jbny p2g.eyt 5 qz0taining only three identical 6Ω resistors?

  94.37: You are given three 1.0 Ω resi,seyw ngg0/( zmcr(q ua3.2oustors. Which of the following equivalent resistances CANNOT be produced using all three resis2my( .nqw,ga30cuso z/uger(tors?

  02.06: Three resistors of different values can be connected together in difm): g5 gjxtwp)f )l8dgferent configurations. If all three resistors are used in a circuit, how mpx)m tj f)gg8 )5lwd:gany different values of total resistance can be produced?

  97.35: When a single resistor is connected to a battery, a total power P 8cawq+zai/;x 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 ofca ax i+z/8qw; the battery is zero.

  96.16: When two resisto5gd ndw6jybu;*h x 4gu cy9.1dur0ws(rs, having resistance R1 and R2, are connected in parallel, the equivalent resistance of the combination is 5Ω . Which of the;dd5w9yj6 n g uwbd*4cyg0u.r1x h u(s following statements about the resistances is correct?

  02.46: A hotplate is designed such that it has a resistanc aizbf,b6mtcj9 n*49 ee of 12Ω when operating a*94 9btfac mb ,n6eizjt 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 resiy 5qrqnl,b.2r ,9jfbzstor that is dissipating 36 watts of powl z9,q5j,fq. b2brnry er?

  01.24: An electric heater draws 13 amperes of current when connected to 120 v glj1q,0e2 yff;wn2riolts. Ifnwf2gq ,0j1l 2 ri;eyf 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 muc fn0..j7kzc n(ajjs a:h would it cost to keep a 100W lightbulb lit continuously for 1 year atza:nnjk a.j0 jfc7 (s. a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through awt,i;y;*wm:m ; viwm q* i.rqh lightbulb results in a power of 24.0 W associated with the bulb. Which one of the following choices best represents the resistance of the lightbqymqh w i.r:; ;mtviw;*i, m*wulb?

  01.10: Each member of a family of six gw201) qr0yz lk;zcok ( .:mz2kruiacnkp,h)owns a computer 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 is the maxim2rq;nz1cc)g kkhaz (uym00pzk )ko:l2 r,. wi um number of the computers can be operating at the sametime?

  03.16: A 9-volt battery is connected to four resistors to for-pd d 7ul+3xfsjbnl--m a simple circuit as shown tpnl3 bfx +du7s---lj do 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 circ m.wkg g2wws3*a+rd4pjyo +z 8uit as shown to the r+kg psro.wa zjd mw8g24 *3y+wight.
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 arq4*3 uhr zvt+ li3e3m1vemgq- e connected as showvq4 1e33mih +*uetqrz 3 vmg-ln. 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 battery, an ideal ammete -gh s,) iinobp-avtxhgh42;7 r, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammet ,xhpnvo igh-gb7tsh -;)42aier 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 swia/,4h qxc6 iyccjk(qy/7 y7hdtch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2c q(,cq h//yyd4ijk a7y7c hx6.0 amperes.
When the switch is closed, what would be the current in the circuit?

  12.14: For the circuit shown to t muihycdlz2w6/sgsf;.r-w m -h 4-5r mkk6f9 mhe right, what is the equivalent resistance? Assume that all wires are ideal, the batteri6 k9m k.mw/m-6r y-5mfhdh fw-sug4sz 2r ;cly has no internal resistance, and all three resistors have identical resistance R.

  09.07: The equivalent resistance of t4zrvvbjbe/7*3ghhbr25 pjo( he circuit shown to the right with resistag 7jp3v 5j/4h ver oh*br(2bbznces $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five8plmok:ibzqeg 1n9/8k cj-m 3 s-* kwa identical resistors connected in a combination series and parallel circuit to a voltage sour l wkms*je9 3-mc/ai8:-qp 8gb1z nkokce.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical r7+1 zp oggm.zdesistors connected in a combination series 7op+g1z md.gz and parallel circuit to a voltage source.
Which resistor(s) have the greatest rate of energy dissipation?

  07.29: In the circuit diagram 1 7yl(um 59loezyt-(wjlv so., all of the bulbs are identical. Which bulb will be they 1y9 l u7v-oow5st(e .lzmlj( brightest?

  02.21: An ideal battery, an ideal ammeter, a switch and thkrw,x 3t usye9 58wpp8ree resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 ame8t9p5u kxr sw, w8y3pperes.
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 t+ub : n0.xvb /zel2yophree resistors are connected as shown. With the switch open as shown in the diagram the.bbpn/ 2y ulzv0+o :xe 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 z5lr,40j6cr(gx*a fiq5+szq l1n vfvresistors are connected as shown. With the switch open as shown in the diagram the ammeter rvc0qvi4 5+ zrx6sral 15f, jf* nq(zlgeads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?