A series of free GCSE/IGCSE Physics Notes and Lessons.
Diodes and LEDs
In these lessons, we will
• Describe and explain the shape of the current - potential difference graph for a diode.
• Describe what is meant by a light-emitting diode and explain why they are useful.
The current through the diode flows in one direction only. This is because the diode has a very high resistance in the reverse direction. Therefore, diodes are useful for controlling the flow of current in circuits.
Light-Emitting Diode (LED)
An LED gives off light when a current flows through. LEDs are an extremely energy-efficient source of light.
Diodes - IGCSE Physics
What are diodes?
Describe a half-wave rectifier and a full wave rectifier for converting alternating current to direct current.
Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.