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52.1 x 38.9 cm ⏐ 20.5 x 15.3 in (300dpi)
ROYAL INSTITUTION OF GREAT BRITAIN / SCIENCE PHOTO LIBRARY ROYAL INSTITUTION OF GREAT BRITAIN / SCIENCE PHOTO LIBRARY
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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