A small city requires about 19 MW of power. Suppose that instead of using high-voltage lines to supply the power, the power is delivered at 120 V .
Assuming a two-wire line of 0.60cm -diameter copper wire, estimate the cost of the energy lost to heat per hour per meter. Assume the cost of electricity is about 8.5 cents/kWh.
Cost = $ per hour per meter
The Attempt at a Solution
I used P=IV to find the current (converting 19 MW to 19*10^3 to keep it in kW for the answer) and found I=158 A .. then when I go to find the resistance I figure to use pi*r^2 as area than multiply the whole thing by two for the two wires but I do not understand what to use for L because they provide no length after i find R i intend to plug it into the equation P=I^2*R .. i am so lost!