dynamo

Click a letter for the index

Or search the encyclopaedia:

 

 

Go

 

Click images to enlarge
In physics, a simple generator or machine for transforming mechanical energy into electrical energy. A dynamo in basic form consists of a powerful field magnet between the poles of which a suitable conductor, usually in the form of a coil (armature), is rotated. The magnetic lines of force are cut by the rotating wire coil, which induces a current to flow through the wire. The mechanical energy of rotation is thus converted into an electric current in the armature.

Present-day dynamos work on the principles described by English physicist Michael Faraday in 1830, that an electromotive force is developed in a conductor when it is moved in a magnetic field. The dynamo that powers the lights on a bicycle is an example of an alternator, that is, it produces alternating current (AC).

Orange represents courage and sacrifice. White represents truth, purity, and peace. Green represents faith, fertility, and chivalry. The emblem is the Ashoka Chakra (‘Wheel of the Law’). Effective date: 22 July 1947. >>