Two cities are `150 km` apart. Electric power is sent from one city to another city through copper wire. The fall of km is `0.5 Omega`. The power less in the wire is

Options

A. `19.2 W`
B. `19.2 kW`
C. `19.2 J`
D. `12.2 kW`

Answer

B

Explanation

(b) Total resistance `R = (0.5 Omega//km) xx (150 km) = 75 Omega`
Total voltage drop `= (8 V//km) xx (150 km) = 1200 V`
Power loss ` = ((Delta V)^(2))/(R ) = ((1200)^(2))/(75) W`