REAL POWER [Actual power]:
In AC circuit because of phase difference between current and voltage the average value of real power is given by
P=V*I*cos(θ);
and its measure unit is Watt(W).
REACTIVE POWER [Useless power]:
Power merely absorbed and returned in load due to its reactive properties is referred to as reactive power.The average value of reactive power is given by
Q = V *I*sin(θ);
and expressed in unit VAR.
Apparent Power:
Total power in an AC circuit, both dissipated and absorbed/returned is referred to as apparent power.
S=V*I;
and is expressed in unit as VA.
Apparent Power = √ (Real power^2 + Reactive Power^2);
IMPORTANT NOTES:
- Resistor absorbs the real power and dissipates in the form of heat and light.
- Inductor absorbs the reactive power and dissipates in the form of magnetic field.
- Capacitor absorbs the reactive power and dissipates in the form of electric or electrostatic field.
In AC circuit because of phase difference between current and voltage the average value of real power is given by
P=V*I*cos(θ);
and its measure unit is Watt(W).
REACTIVE POWER [Useless power]:
Power merely absorbed and returned in load due to its reactive properties is referred to as reactive power.The average value of reactive power is given by
Q = V *I*sin(θ);
and expressed in unit VAR.
Apparent Power:
Total power in an AC circuit, both dissipated and absorbed/returned is referred to as apparent power.
S=V*I;
and is expressed in unit as VA.
Apparent Power = √ (Real power^2 + Reactive Power^2);
IMPORTANT NOTES:
- Resistor absorbs the real power and dissipates in the form of heat and light.
- Inductor absorbs the reactive power and dissipates in the form of magnetic field.
- Capacitor absorbs the reactive power and dissipates in the form of electric or electrostatic field.