Magneto hydrodynamic generators

Fundamentally MHD generators are not much different from the conventional generators. Faraday's fundamental laws of electromagnetic induction, i.e., when a conductor and magnetic field move with respect to each other an e.m.f. is induced in the conductor and if the circuit is complete an electric current will pass through it. It consists of a pipe through which a gas at a very high temperature and pressure passes from left to right. The field coil shown provides magnetic field in direction perpendicular to the direction of the motion of the gas-An e.m.f. is induced in a third mutually perpendicular direction. The reason of the gas, being used at high temperature is that it becomes conductive. To increase the conductivity further the gas can be seeded i.e., a small amount of vaporized metal such as potassium is added