# Three-phase power by two watt-meters method

Three-phase power can be measured by two watt-meters method. In this method, we have two types of connections. They are star and delta connections of loads. In this electrical calculator, 3 phase power can be estimated using the star type connection.

## Calculator of three-phase power by two watt-meters method

### Formula

P = ( V_{12} * I_{2} * cos ( 30 + θ ) ) + ( V_{13} * I_{3} * cos ( 30 - θ ) )

- P = Three Phase Power V
_{12}, - V
_{13}= Voltage I_{2}, - I
_{3}= Current - θ = Displacement Angle
- cos = Cosine