Enter any two values. While entering your 2nd value the remaining values will be calculated and filled in automatically.

I	=	Current	=		Amps
P	=	Power	=		Watts
R	=	Resistance	=		Ohms
V	=	Voltage	=		Volts

Formula Reference:

I	=	V ÷ R	=	P ÷ V	=	√P ÷ R
P	=	V x I	=	V2 ÷ R	=	I2 x R
R	=	V ÷ I	=	P ÷ I2	=	V2 ÷ P
V	=	I x R	=	P ÷ I	=	√P x R