What is the amplitude middle and effective values of 220 V AC?

The amplitude (or peak value) of a 220 V AC voltage is approximately 311 V, calculated using the formula ( V_{peak} = V_{rms} \times \sqrt{2} ). The middle value, or average value, of a pure sine wave AC voltage is ( V_{average} = \frac{V_{peak}}{\pi} ), which is about 99.73 V. The effective (or root mean square) value is given as 220 V, which represents the equivalent DC value that would deliver the same power to a load.