balaji

• Sep 21st, 2011

 

power = ie cos (theta), the dot product of current and voltage in an ac circuit.

the power factor is the cos of the angle between e and i.

if you give some values of power,i,e..u will get power factor accurately.

harish kumar

• Sep 21st, 2011

 

As you know cos theta is what its the angle between the voltage and current.
so at one time voltage lead the current and at other intent current leads the voltage. these are called the leading and legging component of current. as i have shown the two components of the current I COS ph and I SIN ph. As leading component helps to reducing the our electricity bill so we try to improve it and try minimize the reactive component.

Actually Power Has two components :

1. Active Component i.e. P=VI COS ph
2. Reactive component i.e. P=VI SIN ph

Moruttak

• Dec 12th, 2011

 

Power(active power)=voltage* component of current in the direction of voltage.
Thus if power factor angle is theta, current component in the direction of voltage is =magnitude of current * cos (theta) .