The voltage of sinusoidal current for lighting is 220 V, what are its effective value and peak value?

The voltage of sinusoidal current for lighting is 220 V, what are its effective value and peak value?

The effective value of sinusoidal current and voltage is u = 220 V & nbsp; & nbsp; peak value um = 2 u = 220 V = 311 V & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; answer: the effective value and peak value are 220 V and 311 V respectively