Question
Two cities are 150 km apart. electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 V and the average resistance per km is 8 V and the average resistance per km is 
. The power loss in the wire is,
-
19.2 W
-
19.2 kW
-
19.2 J
-
12.2 kW
Solution
B.
19.2 kW
Potential difference (drop) between two cities = 150 x 8 = 1200 V
Average resistance of total wire = 0.5 x 150 = 
Power loss, P = 
= 19.2 kW
