Question

5. A battery of 9V supplies a current of 1A for 7 min. How much energy is supplied in this time?

Answer 1

Given;

Voltage across the battery = 9V

Current across the battery = 1A

Time taken = 7 min

Solution

Power = voltage * current

            = 9*1

 Hence, = 9W

Energy = Power * time in seconds

           = 9 * 7(60)

 Thus,  = 3780J which is energy supplied in 7 min