AC and DC generator Generator is a machine that converts mechanical energy into electrical energy. It works based on principle of faraday law of electromagnetic induction. The faradays law states that whenever a conductor is placed in a varying magnetic field, EMF is induced and this induced EMF is equal to the rate of change of flux linkages. This EMF can be generated when there is either relative space or relative time variation between the conductor and magnetic field. So the important elements of a generator are: Magnetic field Motion of conductor in magnetic field A dynamo is basically an electric motor that works in reverse, small motors can actually be used to generate electricity – by fixing a small propeller (available from science or technology suppliers) to the motor shaft and connecting to a sensitive voltmeter a current will flow when the propeller turns. A model wind turbine can be made in this way. A dynamo uses the principle of electromagnetic induction when in operation- essentially a magnet rotates within a coil of wire to produce a current. As examples of dynamos in action, dynamo powered torches and radios are now available in highstreet stores as well as through lab suppliers. Dynamos are often referred to as turbines when describing the types that create high voltages, such as the turbines in hydroelectric plants.

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