Question

From a power station, the power is transmitted at a very high voltage because :

• A. It is generated only at high voltage
• B. It is cheaper to produce electricity at high voltage
• C. Electricity at high volatge is less dangerous
• D. There is less loss of energy in transmission at high voltage

Answer 1

The correct option is D There is less loss of energy in transmission at high voltage

When power is transmitted from power station to different different substation then one important factor is kept in mind that power loss in pathway during transmission over large distances should be minimum.

we know that P = V I

so for a particular power that is to be transmitted we can choose a combination of voltage and current so that loss is minimum as much possible.

if we do current high and voltage minimum then due to high current , heat loss will be more and power will get lost , hence voltage is kept high and current is kept low as much possible so that current can not produce high vibrations and collisions in free electrons insides the wire making a lot of loss of power.

so by keeping voltage to high value the loss is minimum as compared to other cases.