Diode

Definition

A diode is a semiconductor device that allows current to flow in one direction only, providing low resistance in one direction and high resistance in the opposite. It is commonly used for rectification, converting AC to DC.

5 Must Know Facts For Your Next Test

1. Diodes are essential components in circuits for controlling the direction of current flow.
2. The forward voltage drop of a typical silicon diode is approximately 0.7 volts.
3. In reverse bias, diodes exhibit very high resistance and ideally no current flows.
4. Zener diodes are designed to allow current to flow backwards when a specific reverse voltage threshold is reached.
5. Light Emitting Diodes (LEDs) emit light when forward biased.

Review Questions

• What is the typical forward voltage drop of a silicon diode?
• How does a Zener diode differ from a regular diode?
• Why are diodes important in converting AC to DC?

Related terms

Forward Bias: Condition where the positive terminal is connected to the p-type material and the negative terminal to the n-type material, allowing current flow through the diode.

Reverse Bias: Condition where the positive terminal is connected to the n-type material and the negative terminal to the p-type material, preventing significant current flow.

Rectifier: An electrical device that converts alternating current (AC) to direct current (DC), often using diodes.