No-load current

The no-load current is a term used in electrical engineering and describes the electrical current that flows through a transformer , for example, when it is connected to the rated voltage but is not loaded by the consumer. Due to the no-load current, the power is mainly lost as heat losses. It is therefore advisable to keep no-load losses as low as possible and to disconnect the electrical appliance from the mains so that the no-load current is switched off.