Answer Posted / kamlesh dewangan

Active & Reactive power can be easily understood by thier
formula:

P=V*I*cos@
but cos@=R/Z
so P=V*I*R/Z
also V/Z=I
so P=I(sqr)R
This is the formula for heat loss in the system. Actully no
any system is loss less. so active power is the power that
is lost in the form of heat in the systeor we can say
Active is the power used in the system to compensate
for loss.

simillarly
Q=V*I*sin@
but sin@=X/Z
so Q=V*I*X/z
agian V/Z=I
so Q=I(sqr)X
Since there is no any power loss when current flows through
the pure inductor or capacitor, but the energy is stored in
the form of magnetic field(in inductor) or static field (in
capacitor). So the reactive power is the power used for
magnetizing or is stored in capacitor in the form of static
field.

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