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Explain the terms real power, apparent power and reactive power for ac circuits and also the units used.

Real Powe? It is the product of voltage, current and power factor i.e. P = V I cos j and basic unit of real power is watt. i.e. Expressed as W or kW.

•\tApparent powe? It is the product of voltage and current. Apparent power = V I and basic unit of apparent power is volt- ampere. Expressed as VA or KVA.

•\tReactive Powe? It is the product of voltage, current and sine of angle between the voltage and current i.e.

Reactive power = voltage X current X sinj or Reactive power = V I sin j and has no other unit but expressed in VAR or KVAR.

•\tApparent powe? It is the product of voltage and current. Apparent power = V I and basic unit of apparent power is volt- ampere. Expressed as VA or KVA.

•\tReactive Powe? It is the product of voltage, current and sine of angle between the voltage and current i.e.

Reactive power = voltage X current X sinj or Reactive power = V I sin j and has no other unit but expressed in VAR or KVAR.