16.09: In the circuit shown, an electric current exists inq*jghc p6i p8k8+i)lg the metal resistor connected to the battery. Which one of the following choices best describes the direction of electron flow through the resistor and868ik*j) i+h qlp cggp the direction of the electric field through the interior of the resistor?

  98.06: When any four r8 dr4:c(0y6swvp gg;yt)a81ymcwp , mlw(mev esistors are connected in parallel, the_________each resistm p:6 myagd8gm( 8cetwsv ww;()0y4vy 1r,lpcor is the same.

  06.33: A current through the thin filament wire of a lightbulb causes (d77m twk6px7kwg :hlthe filament to become white hot, while the larger wires connected to the lightbulb remain much cooler. (hk 7w:76m dwkl7xptgThis happens because

  13.08: Some standard household lights are being replacedgsg7,z1 u v19 rlbnmf; with LEDs. LED is the acronym fz9 r;7ls,v g bfmng11uor which one of the following choices?

  05.16: A cylindrical graphite resistor has length L and cross-section1ipxa tt;y4+ fal 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 re pf ta1x4+yit;sistivity of the cylindrical resistor?

  98.20: Wire I and wire II are made of the same mabypc38r ,txfjko15e3 terial. Wire II has twice the diameter and twice the length of I. If I has resistancer5x3oyk3e8 1pbtjcf , R, II has resistance

  99.31: Wire Y is made ofqr8hkponqd8ka9 x-zwd3aa6hm27 +l9d2 8 cow the same material but has twice the diameter and half the length of wire X. If wire X has a resistance of R then wire Y w229pwlzoanxddh+ kq7 8d-cwa9q38 8 a 6hmkroould have a resistance of

  03.23: A cylindrical resistor has length L and radiusmqv/l2r+ kmbbkhxu4(+3pa.t z0bkg+ r. This piece of material is then drawn so that it isgr4hkp.azmbtl0+ +qk + kbux(vm/3 b2 a cylinder with new length 2L. What happens to the resistance of this material because of this process?

  07.27: A junior Thomas Edisott q;i--lv2 kzn 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 lightbulb produce more light at a given voltag -;i-v ttlzqk2e?

  16.07: Three cylindrical resistors are made of tcg4)ppjbvmq jut1 )e2/kwgp 9b:h8) j he same material. The length and radius of each r4vb p )j9/w hgtqc18mju):jk 2pebg)pesistor 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 resistanc 7r hdazre(gobhs(m,5wi( o37+ee 8vxe R, are connected to a battery in the feoee x7(mi8wh5r bdavz+os(g(3 r,h7 ollowing 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 fourth resistor.” What is the equivalent resistance of this arrangement of four resistors?

  95.35: The voltmeter in the accompanying circuit diagrrp- hj* k,78fwggte 0.b tod*tam has internal resistance 10.0 kW and the ammeter has internal resistance 25.0 ohm. The ammeter reading is 1.00 mA. The voltmeter reading is mos.gt,troef hw *d078pk-*tgbj t nearly:

  97.37: Consider the compound circuit shown to the 9 n*7qyzu v.l/ cf)otpright. The three bulbs 1, 2, and 3 - repres v.*c q9lfp 7oun)yt/zented 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 simple electrical circuit at the right. Ig,o3 3/xtzcl hf rk*i(f the current in all three resistors is equal, which of the foxi*cgkf(/zt oh ,r3l3llowing statements must be true?

  99.37: The diagram at right represents a simple electric circk5 )0qku j) ;)2ydvsemq3 ryubuit composed of 5 identical light bulbs and 2 flashlrk)dy 2)3)e0 v 5qq;sykumjbuight cells. Which bulb (or bulbs)
would you expect to be the brightest?

  00.03: Which of the fol2nyy07 ly4up z(b9alylowing statements is NOT true concerning the simple circuit shown whn4y 9pzyly(bla27 y0uere resistors R1, R2 and R3 are have equal resistances?

  17.29: Two lightbulbs X andY are connected in series e 3vvaj 3mvsop s+t5t rj5/63pto a battery. Bulb X is brighter than bulb Y. Assumesvv35ap o/ 33j+tpe rsv56mtj 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 represents what is observed?

  06.34: How many coulombs will pass through the identified resistor d+*: xu6xcwu biq4b9xin 5 seconds once the circuit ux*b +6 :b4 x9cxiwudqwas closed?

  00.23: If all of the resistors in the following simple circuit hlwa0, fui- 4viq8ko*kp9zb( xave the svap8x(-ikw4 zu*kq0, 9fbi ol ame resistance, which would dissipate the greatest power?

  98.34: In the accompanying circuit diagram, the curren nj /6 fojh+0mhmaapc13nr 2g, skb24q.yf:dnt through the 6.0 Ω resistor is 1.0 A. What is t rf+qyc 362:mfdbj m.nna0shp ja k1n ,2ohg/4he power supply voltage V?

  97.27: Three resistors R1, R2, and R3 are connected in series to a nu/i35.ss)k9d dnlsa battery. Suppose R1 carries a current of 2.0 A, R2 has a resistance of 3.0Ω, and R3 dissipates 6.0 W of power. Ws . dn39ain5/sl )uskdhat is the voltage across R3?

  99.40: Three different resistors R1, R2 andR3 are connected in parallel to o:,f eiy 3-t4u/lhcska battery. Suppose R1 has 2V across it, R2 = 4Ω, and R3 dissipates 6 W. What is the current in Rc-i,t4 os3y/ kefhl u:3?

  99.13: A heating coil is rated 1200 watts and 120 volts. What is thel. ah3d51eeuhtr v,2 x q4x:f8nqt7do maximum value of the current under these cu28,q 3:rtlaxhx vd1d7 fehq4ne t .o5onditions?

  99.23: What is the resistance of a 60 watt lightbulb designe*ia eg4 e3 d:hmm9xen+d to operate at 120 volts?amg:emi hnd94 +ee3x*

  03.09: How much current flows through a 4 ohm resistor that is dissipating 36 7mx3d.:q 80dqee fsv/xg2 op-ehk g5zwatts of d2vh8e3zgk- f5. s7e/dqx0q:g xe pom power?

  05.21: A household iron used to press clothes is marked "120 volt, 600 wa0ys aabu(*-q0 cots e+;+hxwl tt.” In normal usewq u- (xb;t++hs scao*e0y a0l, the current in it is

  01.05: Which of the following resista :bk4thnfivwc6d. fc:ei )t33nces could NOT be produced by a circuit containing onetk6f )t ibdhf :wv3c3n 4:ci.ly three identical 6Ω resistors?

  94.37: You are given three 1.skpb u5md h9 e :*hzu5j;oi a:x1d1)cm0 Ω resistors. Which of the following equivalent resistances CANNOT be prodoa5 :us )cmij eh9pud*;1bd: 5m1xkhzuced using all three resistors?

  02.06: Three resistors of diffe9ts wirc/: r(psqp4hw*3z. ebrent values can be connected together in different configurations. If all three resistors are used in a circuit, how many different values of total resistance can beer* b h.prt4i :p93w( /qwsscz produced?

  97.35: When a single resistor f e2s8 4gd)a+ovks5j2r mn sz)is connected to a battery, 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 sernak 2 2 )z em)grd+84vs5sfjsoies 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 1uozl) i 1r:s.y .qqbein parallel, the equiv i1.e)s:l .oybq1zrqu alent resistance of the combination is 5Ω . Which of the following statements about the resistances is correct?

  02.46: A hotplate is designed sjko (c j)9k*6q 1uhubguch that it has a resistance of 12Ω when operating at 120 volts. What is the minimum amount of j*1h cgj6k9bu)oq (kutime 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 thr-re) p* -yez wt khg6t*qg1/cbough a 4 ohm resistor that is dissipating 36 watts of por6wz) gytq 1e / kbpehtg-c**-wer?

  01.24: An electric heater draws 13 amperes of cu tdwzo* zs0l*tjo8j57 rrent when connected to 120 volts. If the price of electric75lw oz8d*s 0jt*tzo jity is $0.10/kWh, what would be the approximate cost of running the heater for 8 hours?

  08.05 Approximately how much wouzw59 rxd8 4s)6tioxjc1 qf)t old it cost to keep a 100W lightbulb lit continuously for 1 year 5)1qz sdjortx)oi xf9w64tc8at a rate of $0.10/(kW.hr) ?

  12.09: A constant current of 4.00 A through:wg(h8 lzm(ztj-v g4 hgoi ky;dw12;z a lightbulb results in a power of 24.0 W associated with the bulb. Which one of the following choices best oy;8ggigv(z:wd24 h-tz h w1j;m( zl krepresents the resistance of the lightbulb?

  01.10: Each member of mix4 87hqjgnhqs ymrf)f,s *o) /v x5 v8bn1h:a family of six owns a computer rated at 500 watts in a 120 V circuit. If all computers are plugged into a single circuit protecth /gnrysh fn8)mfjh )4v5i,mx81q* q x7 svob:ed 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 7ydf8 a hxp :glz*q76hs/9iid xq 77ts7g9xgh resistors to form a simple circuit as shown 7d atfg*x z d7s6iy8hgh7: xxsglpq9/ 977qihto 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 ac v ilt)0ev1u)en+4pjmpk g x y6:q;p) simple circuit as shown to the right. ))q vn;c lp: gu1i460)jt p y+emkvpxe
What would be the potential at point B with respect to point C in the above circuit?

  02.21: An ideal battery, an ideal amme,8awf+-o/zp7n ixph w ter, a switch and three resistors are connected as shown. With the switch opi n/,7px-hp oawwf8 +zen 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: zo peamd9;k1 0xj,)5mceebc, a switch and three resistors are connected as shown. With the switch open as shoeemc5:cj0 ba xp)dk ;eo1,9 mzwn 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 resiwy(0hf)0 wti zstors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.w(w0fh0 t)ziy0 amperes.
When the switch is closed, what would be the current in the circuit?

  12.14: For the circuit ,xb+4kvrvxxq4kg .7 z shown to the right, what is the equivalent resistance? Assume that kvg4,kvx4qr z b. xx7+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 the0m*tne jc7e5p/ p sv7b right with resistances mc7p/ e*5bs jvte70np $R_1 = 4.00Ω$ , $R_2 = 3.00Ω$ and $R_3= 2.00Ω$ is

  04.20: The diagram below shows five identical resistors connected in a combinati,c78v3ke 53ar+ . esh k)vyifhch(x cho sec73 c hakv35xvkcy+he8)ih,(f.h rn series and parallel circuit to a voltage source.
Through which resistor(s) would there be the greatest current?

  04.21: The diagram below shows five identical resistors connectedo1mhas.0imb ) in a combination m0is)1m.a ohbseries 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 bulbs are iden kp:,urrcf-q .tical. Which bulb c,rqprk- :u.f will be the brightest?

  02.21: An ideal battery, dc w6fv3ks/uwt/vyh5+ h;m b/ an ideal ammeter, a switch and three resistors are connected as shown. With the switch open as shown in the diuhywck 3/tsdv+w65 h// fvmb;agram 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 xj)xt u. w:2enthree resistors are connected as s j nxw2u).etx:hown. 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, an ideal aqmen/ 0t-by*c:xgs 0 mmmeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammet0sb/mgynt 0q-x cm e*:er reads 2.0 amperes.
When the switch is closed, what would be the current in the circuit?