Question

batman recharges his bat taser with 2.5mj of energy in 15 minutes how much power does it draw from the mains

Answer 1

Power = (energy) / (time)

15 minutes = 900 seconds

Power = (2.5mJ) / (900 sec)

Power = 0.00278 mWatts

If your 'm' means 'Mega...', then power = 2,777.8 watts ... about the same as a hefty restaurant toaster, or home microwave oven when it's cooking.