A generating station is producing 1.2 × 106W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of 5.0 × 10-2 Ω/km.
(a) Find the power used to heat the wires if the power is transmitted at 1200 V.
(b) A 100: 1 step-up transformer is used to raise the voltage before the power is transmitted. How much power is now used to heat the wires?