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Unformatted text preview: Chapter 1, Solution 20. Since P=0 306+612 + 3V 0 + 28 + 282310 = 0 72 + 84 + 3V 0 = 210 or 3V 0 = 54 V 0 = 18.0 V Chapter 1, Problem 28. A 30W incandescent lamp is connected to a 120V source and is left burning continuously in an otherwise dark staircase. Determine: (a) the current through the lamp, (b) the cost of operating the light for one nonleap year if electricity costs 12 cents per kWh. Chapter 1, Solution 28. (a) i = = = 120 30 V P 0.250 A (b) Number of Watthours = pt = 30 365 24 Wh = 262.8 kWh Cost = $0.12 262.8 = $31.54 Chapter 1, Problem 36. A battery may be rated in amperehours (Ah). A leadacid battery is rated at 160 Ah. (a) What is the maximum current it can supply for 40 h? (b) How many days will it last if it is discharged at 1 mA? Chapter 1, Solution 36. (a) i = h Ah 40 160 = 4.00 A (b) t = = = day h h A Ah / 24 000 , 160 001 . 160 6,667 days or 6.67 x 10 3 days...
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 Fall '06
 MCCANN

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