Question

The Ac supply in our hours is

Answer 1

We use AC supply in our homes because it is feasible to transmit the AC at larger distances. To develop a detailed insight lets consider the Power Transmission model. Alternator (Synchronous generators) are the ac machines which generate the electrical power.

Answer 2

AC supply in our houses are 220 volts, step down substation with large Transformers will reduce the power down to 2200 volts then a small Transformer on a typical service will step down to 220 volt the required voltage for a residential home.