Answer to Question #117661 in Electric Circuits for Sam

Question

the voltages used to transmit electricity through the national grid for a variety of uses, have been selected and why they may be different at different points in the transfer system

Answer 1

As we know that in the national grid, there is used a step-up transformer which increase the voltage and reduce the current. If the current is less the loss of the energy will be less by lost thorough the heat of the wire, To keep people safe from these high voltage wires, pylons are used to support transmission lines above the ground.