**a)**

**Real Power (P)**

It is the power which is actually dissipated in the circuit resistance. Also called Active Power.

Measured in Units of Watts

**b)**

**Reactive Power (Q)**

It is the power developed in the inductive reactance of the circuit.

Measured in Units of Volt-amperes-reactive (VAR)

**c)**

**Apparent Power (S)**

It is given by the product of r.m.s. values of applied voltage and circuit current.

Measured in Units of Volt-Amperes (VA)

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