Diode Basics Quiz

Diode Overview

• A diode is a semiconductor device that allows current to flow in one direction only, functioning as a one-way switch.

Primary Function

• The primary function of a diode is to control the direction of electric current flow within a circuit, ensuring that it only moves in the forward direction.

Behavior of a Diode

• When forward-biased, a diode has low resistance and allows current to pass.
• When reverse-biased, a diode presents high resistance and restricts current flow, acting as an insulator.

Reverse-Biased Condition

• In a reverse-biased condition, a diode blocks current flow, except for a tiny leakage current that is typically negligible in normal operating conditions.

Forward-Biased Condition

• In a forward-biased state, the diode allows current to flow freely once a specific threshold voltage (known as the forward voltage drop) is exceeded.

Breakdown Voltage

• The breakdown voltage is a critical parameter; exceeding it in a reverse-biased diode leads to a significant increase in current flow, potentially damaging the diode unless it is specifically designed to handle breakdown conditions (like Zener diodes).

Current Flow in Reverse Bias

• In a reverse-biased diode, minimal current flow occurs primarily due to the depletion region widening, which creates a barrier that prevents charge carriers from moving across the junction.

Test your knowledge about diodes with this quiz. Find out what diodes are, their primary function, and their behavior in different biasing conditions.