-
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 Ω. The power loss in the wires is :
-
- 19.2 W
- 19.2 kW
- 19.2 J
- 12.2 kW
Correct Option: B
Total resistance R = (0.5 Ω/km) × (150 km) = 75 Ω
Total voltage drop = (8 V/km) × (150 km) = 1200 V
| Power Loss = | (Δ V)² | = | (1200)² | W |
| R | 75 |
= 19200 W = 19.2 kW
