High voltage grids are used to transmit electricity because-
- AThe current is higher
- BThe power loss is higher
- CThe resistance is lower
- DThe heat loss is lower
Show answer and explanation
Correct answer: (d) The heat loss is lower
Explanation
For the same power (P = VI), transmitting at high voltage means a small current. The heat wasted in the wires is I²R, so a smaller current means much less heat loss.
Transformers step the voltage up for transmission and down again for homes.