Veena’s car radio will run from a 12 V car battery that produces a current of 0.20 A even
when the car engine is turned off. The car battery will no longer operate when it has
lost 1.2 x 106 J of energy. If Veena gets out of the car, leaving the radio on by mistake,
how long will it take for the car battery to go completely dead, i.e. lose all energy?
(1 day =86400 second)
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"Potential difference of the battery of a car(V) = 12 V
Current produced by the battery (I) = 0.2 A
Energy at which car battery becomes dead = 1.2 x 106 J
Power = V x I; Energy = V x I x t
Time taken for the car battery to go completely dead t = energy / power
t = 1.2x106 / 120 x 0.2 : 1.2x106 x2.4
= 0.5 x 106 ; 5 x 105s
1 day = 86400 seconds = = 5.78 days
Car battery will lose all of its energy after 5.78 days.
"
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