Why are transformers used in national grid?

Because Less energy is lost from wires at a high voltage Additional answer When you pass electricity through wires you warm the wires up. This heat is a total loss of energy. So you want to keep the loss to a minimum.

The heating effect of electricity is increased with an increase in amperage (the current). The amount of power that goes through the wires is a function of the voltage x amps. So to transmit a certain amount of power with the minimum heat loss you keep the current down which mean pushing the voltage up.

This is why the transmission wires near the generating station carry very high volatges. But these voltages are unsafe for use in domestic circuits so they have to be reduced by a series of transformers from the high volatges in the main lines to lower voltages at substations to even lower voltages in the home Read more: wiki.answers.com/Why_are_transformers_ne... Comment The main reason for transmitting energy at high voltages is because, for any given load, the higher the supply voltage, the lower the load current (I = P/V). Low load currents are necessary to minimise the necessary cross-sectional area of the conductors in order to minimise their weight and, of course, cost.

The 'energy loss' advantage, described in the above answers, is a secondary advantage and not the primary reason!

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