Question

state the voltage at which electricity is supplied to our houses​

Answer 1

The Voltage that you get in India supplied by the power company is 220v-240v at 50Hz frequency but that voltage supplied is actually is AC voltage i.e it is a sinosudial voltage form with a time period of 0.02 seconds (i.e it completes its one cycle from 0->+ve->0->-ve->0 within 0.02 seconds).

This Voltage of 220v-240v is actually the average value of actual maximum voltage supplied to our household. This value is called the RMS voltage or Root Mean Squared voltage.

Actually average value of sinosudial function over 1 time period is zero so to find the average value we square the terms and find its average.

So according to this V/sqrt(2)=220v-240v

So the maximum value of voltage supplied to our household varies from V=(220*1.41)v to (240*1.41)v and this maximum value oscillates between positive and negative cycle.There are two types of supplies are fed by State electricity board

single phase

three phase

the voltage rating of single phase is 230V(rms)

and for three phase is 440V(rms)

This ratings are Line voltage

so according to our requirement government gives us three phase power supply also if the total load is more than 4KW then 3-Phase is compulsory

Answer 2

220 volt may be...

hope it helps u...