7. Batman recharges his Bat-taser with 2.5MJ of energy in 15 minutes. How much Power does it draw from the mains?

Power does it draw from the mains = 2.78 kW

Explanation:

Power = Work / Time.

Here work done = Energy used by Bat taser = 2.5 MJ = 2.5 x 10⁶ J

Time taken = 15 minutes = 15 x 60 = 900 seconds.

Power = Work / Time = 2.5 x 10⁶/900 = 2777.78 Watt = 2.78 kW

Power does it draw from the mains = 2.78 kW