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.