Faraday's induction coil. This is an iron ring, around which are wounds two insulated coils of copper wire on each side. It was made by Michael Farada

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Faraday's induction coil. This is an iron ring, around which are wounds two insulated coils of copper wire on each side. It was made by Michael Faraday in 1831. Passing a current through one wire induces a voltage in the other by a process called mutual inductance. This is because the initial current creates a magnetic field in the ring. A change in magnetic field within the second coil creates a transient current - a burst when the initial current is switched on and another when it is switched off. This coil is now on display at the Royal Institution, London.

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Size: 6113px × 4585px
Photo credit: © ROYAL INSTITUTION OF GREAT BRITAIN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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