Applied experiments in electrical engineering relating to testing of 1-phase and 3-phase transformers; brushed and brushless direct current generator; brushed and brushless direct current motor; 3-phase synchronous generator; 3-phase synchronous motor; 3-phase induction motor; 3-phase induction generator; speed control of direct current motor using chopper circuit and speed control of 3-phase induction motor by using a 3-phase inverter