ACTION  COMMUTATOR: Why output of commutator / dc generator is dc?commutator arrangement If  somehow,connection of the coil side to the external load is reverse at the same instant the current in the coil sides reverses,as shown in below figure,the current through the load will be direct current.  This is what a commutator does. Above...

Transformers are constructed so that their characteristics match the application for which they are intended. The differences in construction may involve the size of the windings or the relationship between the primary and secondary windings. Transformer types are also designated by the function the transformer serves in a circuit, such as an isolation...

Explanation of Construction of Dc motor, types of dc motors series, shunt and compound dc motorsfig: dc motor working principleIf a current carrying conductor is placed into the field of a permanent magnet, as shown in Fig, a force will be exerted on the conductor to push it out of the magnetic field.  PRACTICAL D.C. MOTORS Fig: dc motor...

Transformer Noise The"hum"caused by energized power transformer, under no-load conditions,originates in the core where the laminations tend to vibrate by magnetic forces. The noise is transmitted  through the oil to the tank side and thence to the surroundings. The following are the main factors which produce noise in transformers:1. Magnetostriction...

air circuit breaker A circuit breaker is a device that is used to completely disconnect a circuit whenany abnormal condition exists. The circuit breaker can be designed to actuateunder any undesirable condition.The purpose of a circuit breaker is to break the circuit and stop the current flow when the current exceeds a predetermined value without causing...