All inductive equipments those operate on an AC supplied network , convert the supplied enery in electrical form into mechanical movement and heat. This energy is measured by a kWh meter and is called active energy.
Magnetic fields are created in the equipments to make that conversion ; and these fields are related with so called reactive energy that is supplied from the power supply.
This is because of the energy absorvation and re-injection of the inductive load from and into the system in cycles. This happens twice in every frequency cycle during the rise and the downfall of the magnetic fields.
All electro magnetic equipments and magnetic coupled winded components which work on AC supply,like motors, discharge lamps, transformers , reactors and etc., always need an amount of reactive current to create magnetic flux.
