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PN Junction Diode Unit

Product Code : SCL-EE-12410

Quick Answer: The PN Junction Diode Unit is a teaching unit for demonstrating forward and reverse bias, showing that a PN junction diode passes current more easily in forward bias and restricts it in reverse bias.

Last updated: October 2026

Key Features

Demonstrates forward-bias and reverse-bias behaviour
Teaches anode, cathode, polarity and current direction
Supports plotting of V-I characteristics and threshold voltage behaviour
Can introduce rectification with suitable external components
Allows comparison with Zener diode and LED behaviour

About This Product

After identifying the anode and cathode, students connect the diode in forward bias with a series resistor to limit current, measure voltage and current, then repeat in reverse bias within the unit's safe rating. The results show threshold behaviour and how the junction passes current more readily in one direction.

Frequently Asked Questions

Q1. Why is a series resistor used?
It limits the current during the experiment. The diode should never be connected directly across a power supply without current limiting.

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PN Junction Diode Unit

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