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 volt and the average resistance per km is 0.5 The power loss in the wire is:

(A) 19.2 W 

(B) 19.2 kW 

(C) 19.2 J 

(D) 12.2 kW 

Answer 1

Correct option (B) 19.2 kW

Explanation:

Total voltage drop = 150 × 8 = V 

total resistance of wire R = 0.5 × 150