Question
Wed August 15, 2012 By:

a bulb used in a car is rated 12volt,48 watt.find the energy consumed in one minute when the bulb is connected to A)a 12V battery B)a 6V battery

Expert Reply
Sat August 18, 2012
Resistance of bulb, R = V2 /P  (because, power, P=V2/R)
thus R = 3 ohm
 
thus when 12V is connected, thus: current I = 12/3 = 4 A
thus energy consumed = IV x t = 48 x 60 = 2880 J
 
when 6  volt is connected, then I = 6/3 = 2 A
thus energy consumed = IV x t = 720 J
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