What did Michael Faraday discover?

Michael Faraday discovered the law of electromagnetic induction in 1831. He realized that current in a circuit can be induced by changing the magnetic field. Faraday tested it by wrapping a paper cylinder with a wire and connecting the coil to a galvanometer.

Faraday then moved the magnet back and forth inside the cylinder. This discovery formed the basis of the adoption of electricity as a new technology. It is the foundational discovery behind the workings of electrical motors, transformers, generators and inductors. Faraday also came up with terminology relating to the study of electricity, such as electrode, cathode and ion.