Tricks, tips, tutorials, pictures and words

Homopolar generator

Like all dynamos, the Faraday disc converts kinetic energy to electrical energy. However, unlike all other dynamos, this machine cannot be analysed using Faraday's own law of electromagnetic induction. This law (in its modern form) states that an electric current is induced in a closed electrical circuit when the magnetic flux enclosed by the circuit changes (in either magnitude or direction). However, the circuit in the Faraday disc is parallel to the magnetic flux vector and therefore encloses no magnetic flux. Therefore, Faraday's law does not apply to this machine.
Homopolar generator - Wikipedia, the free encyclopedia