16.09: In the circuit shown, an electric current exists in the metal resistoalh10+e1fm9 ewwi6b ( ug*rofr connected to the battery. Which one of the follohowur 0a mb*ef g+e1i1w6f(l 9wing 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 re. 7wzp ychvcz3-zl+ejh r:cdqc:5; o,sistors are connected in parallel, the_________each resisyzeoc, z7-hj.;c3:rwcqvl d 5+ phc:ztor is the same.

  06.33: A current through the thin filament wire of a lightbulb causesl4;q9bs*,f4vy*ujcd i;lj hc the filament to become white hot, while the larger wires connected to the lightbulb remain much cooler. This ha4ildl ybjf hvj;,u9q ;c*4c*s ppens because

  13.08: Some standard household lights are being replaced with LEDs. LEDn(l *gp ctxb;505tgb k is the acronym for (gl tx;5tg *50pbkbnc which one of the following choices?

  05.16: A cylindrical graphite resistor has length L and s+mi 8-b ,nodxsu f(5gcross-sectional area A. It is to be placed into a circuit, but it first must be cut in half so that the new lengthixb8s+(5-,n dmus go f 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 In bm29k9bm5 nzen*ta+ I are made of the same material. Wire II has twice the diameter and twice the length of I. If I abn t 9nzmn2bk9*me5+ has resistance R, II has resistance

  99.31: Wire Y is made of the same material but hasz0 -ux gh:zz;l:/ aombfcdx 65 twice the diameter and half the length of wire X. If wire X has b azz0d::6fhuo l ;czxg5x-/m a resistance of R then wire Y would have a resistance of

  03.23: A cylindrical resistor has length L and radius r. This piece of mateb;k zc9pb -k *w5vsv6sz;1mbm rial is then drawn so that it is a cylinder with new length 2L. What hazbp9 1zcbmv-;bkv 6mk ;s5s *wppens to the resistance of this material because of this process?

  07.27: A junior Thomas Edison wants to make a brighter lighc*ij8h c z+en-t bulb. He decides to modify the filament. How should the filament of a lightbulb be modified in order to make the lightbulb produce more+n-c zeic *8jh light at a given voltage?

  16.07: Three cylindrical resistors are made of the same material. The length anoa 20m .* pldy;jrg(lzd radius of each resistor drlo.p(g 0z ;myja2* lis:
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 resistan eh(ouc xbd4;*ce 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 con; oudhe (x4cb*nected 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 resistancd4c,nulxum1zm v. v4a2p 95yfe 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter rea pz44u la cn9mfvmx1u2,vy5.d ding is 1.00 mA. The voltmeter reading is most nearly:

  97.37: Consider the compound circuia dyg.p+pi.kl ip ,86gt shown to the right. The three bulbs 1, 2, and 3 - represented as resistor g.+alpip6kd. g, yip8s 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 curreo;wvx 2a(s tj/4n*zd nnt in all three resistors ij2v n ;n a4/tsw(x*zdos equal, which of the following statements must be true?

  99.37: The diagram at right represents a simple electric circuit lc-eu7rr2 im c5 cb3lt*dd:.ccomposed of 5 identical light bulbs and 2 flashlight cells.2:c rt5r.7b dlmicc u l-dce3* Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the following statemgy6e ,;- fpn 55 bp/2+pwljh qyro)whlents is NOT true concerning the simple circuit shown wh 5 ;h qwpn-+e,rlh6)wpjg fyy5/2poblere resistors R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are g)ctm:cq cui8xew h6 v)+*(xpconnected in series to a battery. Bulb X is brighter than bulb Y. Assume all circuit elxxqu)hc +pvg c(e 8tw)im:6 *cements are ideal. If bulbs X andY are connected 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 the identified resistor*2hgoi7*z ulc in 5 seconds once the circuit was *z uol7g*hi c2closed?

  00.23: If all of the resistors in the fgojvv**9w ,n0 z3;c x38as uvknyu s4collowing simple circuit have the same resi08*gnk, c4 uvzvowsyunvj9*x;sca 33stance, which would dissipate the greatest power?

  98.34: In the accompanyr5q 38nu7-q f5b6q8vsx rwgvoing circuit diagram, the current through the 6.0 Ω resistor is 1.0 A. What is the power supp fx88 qv7wqru5n6rsq5 3o-gvbly voltage V?

  97.27: Three resistors R1, R2, and R3 are connected ink( xmxk)m,j 1u series to a battery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissipates 6umxm j(k1,) kx.0 W of power. What is the voltage across R3?

  99.40: Three different resistors R1, R2 andR3 are connected in paq4/, degj a)wn std;1l,;kblrrallel to a battery. Suppon;l 1k , ,b drdwtlj)q;a/s4egse R1 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 nu p:-k1a ea7cwatts and 120 volts. What is the maximum value of the current under these condua:c-k np17 eaitions?

  99.23: What is the resistance of a 60 watt lsy4, yhsl61xlightbulb designed to operate at 120 volts?l 1y4yh6ssl,x

  03.09: How much current flows through a 4 ohm resisto(gr( *t4pz t o3glntf54 e1gmrj5*fjor that is dissipating 36 watts of po4t5g1t3r j* (nlrmt5*fo p jfzgo(g4ewer?

  05.21: A household iron used to press clothes is marked "120 volt, y ; 2;hyey(s1fq-b rdv600 watt.” In normal use, the curv-yry( ;b;q2edfs h y1rent in it is

  01.05: Which of the following resistpaikh50r vx; 4*)n jsdances could NOT be produced by a circuit containing only dhrj4 insav5k)* p;x 0three identical 6Ω resistors?

  94.37: You are given thg 37i2 uin9/ g*dwclaoree 1.0 Ω resistors. Which of the following equivalent resistances CANNOT be produced using all three re72ag*io dgl/i9wu nc3sistors?

  02.06: Three resistors of different values can be ct,ug5 cw tso.1onnected together in different configurations. If all three resistors are used in a circuit, how many differe.5t,o1 wutgcs nt values of total resistance can be produced?

  97.35: When a single resistor issw,ol6jr.0,p upl,lh connected to a battery, a total power P is dissipated in the circuit. How much total po 0su .j, l,6rhpl,wplower 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 resistanez +rvgb-i*y q7ul 9pt-6wjre,m2 hv 9ce R1 and R2, are connected in parallel, the equivalent res igb9zw7*erq9-vuyjm,trpl6h2+ev -istance of the combination is 5Ω . Which of the following statements about the resistances is correct?

  02.46: A hotplate is designed such that it has a resistance ofm f0;ya0 j ffxerh2w*:1:of vcvj)b +h 12Ω when operating at 120 volts. What is the minimum amount of time that it would take to warm 0.45r ev*ffm2hx:f y ho;b0j jv:f0+a)w1c kg of water from $15^{\circ}C$ to$85^{\circ}C$?

  03.09: How much current1n;sgnan rh7kb6+yb;e+foy: flows through a 4 ohm resistor that is dissipating 36 watts of powey rfn1y+e:nabnb 6 kso;;+7 hgr?

  01.24: An electric heater draws 13 ampe+- sopy1toxch;f)/ e jres of current when connected to 120 volts1 oyf ;+hetxocs/)j-p. If 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 much would it cov+6 yd5/d,yir0pz hqost to keep a 100W lightbulb lit continuously for 1 yeydi,rd+ qo/zh0y 5 6pvar at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A th /iy:bc 0+aw.aaffy:ac 2qf m*rough a lightbulb results in a power of 24.0 W associated with the bulb. Which one of the following choices best represents the ray2ac+ .bwa :am:i/f *cqyff0esistance of the lightbulb?

  01.10: Each member of a family of six owns a compm1j*4 dx.yjxvz7y i.xuter 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 maximum number of the computers c1 .zx.yjmyj7 d*x4vxian be operating at the sametime?

  03.16: A 9-volt battery is connected to four resistors to form a +, h6juz 6d9rg +lfdwwsimple circuit as ,zw6gd+ l +rud6fwhj9shown 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 im isc zy/:1sjypo 94;ur+vp8,yl*uuvg * hy/o s connected to four resistors to form a simple circuit as shown to sur huy/*ym p/9ilsuj;p vy81+g4oyo :,*cvzthe 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,s7b ko68tl/ bdh 4;gg 7+5oxikzzl,wp a switch and three resistors are connected as shown. With the switchzwh/5; g7 bklo8tg 7pd4bl,ks iz+6xo 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 ammeter, a switch and three resish :l;bh4a ife+56yxuw4-vw kytors are connected as shown. With the switch o; b4k4: w5ihexy w+lyahv-6fupen 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, an ideal ammeter, a switch and three resistorsnpp 1,p u1mu,qnb7 l;c are connected as shown. With tuup n1q bcpm7pl,1,n; he 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 right, what7k-ufa 3sn z)h is the equivalent resistance? Au3k7-n fs h)zassume 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 the o5nyw; r5gha ( right with resistaga(nh y5;5rwo nces $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five 6k. jhxkr )x8bidentical resistors connected in a combination series and parallel circuit to a voltage sour.b8k)x jx6hk rce.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resis;;/9zs flmaws ikt7 lu(gkl k6nf4x28tors connected in a combinationwf7xkkfnl2l a/s8;s u6 ltz4gk9im ( ; series 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 th(g kpa2(o hdvypa:x6 jsx6: q.e bulbs are identical. Which bulb wilaq:2 hk.(y gpxax 6(jso6pdv:l be the brightest?

  02.21: An ideal battery, an ideal ammeter, a switch and threecxzqs:ib:1z*lg i 1p6 resistors are connected as shown. With the switch open as shown in q6 p1iil:z* s:1xbgzc 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 switch and three resisto0em(nd +s (qcors are connected as shown. With the switch open as shown in the dqm((cdo+e0 n siagram 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, j8xh(/ h:igd5lk(rqwf1 nt.ga switch and three resistors are connected as shown. With the switch open as .8lf5(w/gxgi(jh :nr kq dht1 shown in the diagram the ammeter reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?