PhysicsChapter 9: Electronics
Diode As A Valve
Introduction
A diode is a semiconductor component designed to allow conventional current to pass much more easily in one direction than in the opposite direction. This is why a diode can be compared with a one-way valve.
Definition
Forward Bias
When a diode is connected in the conducting direction, it is **forward biased**. Once suitable forward conditions are reached, it conducts strongly.
Reverse Bias
When connected in the opposite direction, it is **reverse biased**. Ideally, very little current flows under normal reverse-bias conditions.
Why It Is Useful
Because it controls current direction, a diode can be used for: * rectification; * reverse-polarity protection; signal control; electronic circuits.
Exam preparation
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Review the key facts, formulas and checks before you move on.Diode As A Valve
Sticky Notes · Quick Revision
DIODE
- Forward → ON/conducting
- Reverse → blocks
USE
- Rectification
60-second revision
- Diode → one-way behaviour.
- Forward bias → conducts.
- Reverse bias → blocks most current.
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