A 5.0 V battery storing 43.0 kJ of energy supplies 1.5 A of current to a circuit. How much energy does the battery have left after powering the circuit for 1.0 h?
For 1 hour supply
power supplied battery = V*I = 5*1.5 = 7.5W
Energy = power*time = 7.5 * 3600 J
battery has intially 43.00 kJ of energy
so energy left = 43000 - 7.5*3600
= 16000
= 16 kJ
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