A Light-Emitting Diode, commonly referred to as an LED, is a semiconductor device that emits light when an electric current passes through it. Unlike traditional light bulbs, LEDs do not have a filament, and can only work when placed in a specific direction within a circuit. LEDs are known for their energy efficiency, long lifespan, and small size, making them widely used in various applications, from indicator lights to large-scale lighting systems.
Examiner-written GCSE Physics revision resources that improve your grades 2x
- Written by expert teachers and examiners
- Aligned to exam specifications
- Everything you need to know, and nothing you don’t

Share this article