100 kW (10^5 W) of power is delivered to the other side of a city by a pair of power lines, between which the voltage is 12,000V.
a.) Show that the current in the lines is 8.3A.
b.) If each of the two lines has a resistance of 10 Ohms, show that there is a 83-V change of voltage along each line.
c.) Show that the power expended as heat in both lines together is 1.38 kW
d.) How do your calculations support the importance of stepping voltages up with transformers for long-distance transmission?