138 Direct Current CircuitsP28.18(a)∆VIR=:33 011 01..V =IΩaf33 022 02=IΩI3300=. AI2150=AP=IR2:12110=A afafΩ22220=afafΩ199 0=. W249 5=The 11.0- resistor uses more power.Ω(b)PP12148+=W===IV∆afafaf450 330148WFIG. P28.18(a)(c)RRRs=+=+=11 022 033 0...ΩΩΩ∆R=: 33 033 0=IΩ, so I=100A=2:12=afafΩ22=afafΩ111 0=222 0=The 22.0- resistor uses more power.ΩFIG. P28.18(c)(d)22330+ ==IR RbgWΩ=∆afaf.VW(e)The parallel configuration uses more power.*P28.19(a)The resistors 2, 3, and 4 can be combined to a single 2Rresistor. This is in series withresistor 1, with resistance R, so the equivalent resistance of the whole circuit is 3R. In series,potential difference is shared in proportion to the resistance, so resistor 1 gets 13of thebattery voltage and the 2-3-4 parallel combination get 23of the battery voltage. This is thepotential difference across resistor 4, but resistors 2 and 3 must share this voltage. 13goes to2 and 23to 3. The ranking by potential difference is ∆∆∆∆VVVV4312>>>.(b)Based on the reasoning above the potential differences are
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .