Faraday's Law of Induction

A changing magnetic flux through a circuit induces an electromotive force; it underlies transformers, generators, and motors.

Specifications & Metrics

symbol

ℰ = −dΦ/dt

Core Principles & Analysis

• The breakthrough came in 1831, when Michael Faraday demonstrated that a changing magnetic field induces an electric current.
• Joseph Henry independently made similar observations in 1832, though Faraday was the first to publish his findings.
• Lenz's law, formulated by Emil Lenz in 1834, gives the direction of the induced emf.

Open in the Simulator — run this concept live

Sources

• Wikipedia: Faraday's law of induction