Dynamo - GCSE Physics Definition

In the context of GCSE Physics, a dynamo is a device that converts mechanical energy into electrical energy through the process of electromagnetic induction. It typically consists of a coil of wire and a magnet. As the coil rotates within the magnetic field (or vice versa), it induces an electrical current in the wire.

This process is based on Faraday's law of electromagnetic induction, which states that a change in magnetic flux through a circuit induces an electromotive force (EMF).

Dynamos are commonly used in applications where electricity is needed but only mechanical energy is available, such as in bicycle lights where pedalling powers the light, turning kinetic energy into electrical energy.