Verified answer

6.0 times 5.0 times 12 = 360 watt hours = 0.36 kilowatt hours which are generally acceptable units of energy. Multiplying by 3600 = 1,296,000 watt seconds, so I think the other answer is wrong. He should have multiplied by 3600 instead of 60.

Real world dead car batteries would require at least 13 volts to average 6 amps, due to a few milliohms internal resistance of the battery, which possibly accounts for title of this question. Neil

(6 x 12) = 72W., = 72 Joules/ sec.

72 x (5 x 60) = 21,600 Joules.