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CBSE Class 10 Answered

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
Asked by | 15 Aug, 2012, 02:55: PM
answered-by-expert Expert Answer
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
Answered by | 18 Aug, 2012, 09:48: AM

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