72 watts, and: > With 7140 loops of wire required and a length per loop of 20 m, the farmer would need 143 km of wire! At $0.15/ft = $0.50/m, this wire would

72 watts, and: > With 7140 loops of wire required and a length per loop of 20 m, the farmer would need 143 km of wire! At $0.15/ft = $0.50/m, this wire would cost $71,400! This means that even at the maximum energy consumption rate, the payback period would be at least 1000 years!