Question

voltage of our household supply is

Answer 1

Answer:-

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.

BEST OF LUCK ^_^