An air conditioner draws 15 A at 220-V ac. The connecting cord is copper wire with a diameter of 1.446 mm.
A) How much power does the air conditioner draw?
B) If the total length of wire is 20 m , how much power is dissipated in the wiring?
C) If no. 12 wire, with a diameter of 2.053 mm, was used instead, how much power would be dissipated?
D) Assuming that the air conditioner is run 18 h per day, how much money per month (30 days) would be saved by using no. 12 wire? Assume that the cost of electricity is 12 cents per kWh.