Light emitting diodes
Electrical Technology · Grade 10 · about 40 minutes
How an LED differs from an ordinary diode, why it always needs a series resistor, and how to calculate that resistor.
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- 6 sections of explanation, worked examples and diagrams
- 1 practice task with hints and worked answers
- A quiz that marks itself as you go
- Your progress kept across every subject you take
Other lessons in this sub-strand
- Semiconductor diodes
- Diode structure, terminals and symbol
- Forward bias: how a diode conducts
- Reverse bias: how a diode blocks
- Turn-on voltage: silicon, germanium and LED
- The diode characteristic curve
- Plotting a diode characteristic in the workshop
- Rectifier diodes and their ratings
- Half-wave rectification
- Full-wave bridge rectification
- Smoothing and ripple
- The complete DC power supply
- Light emitting diodes
- Zener diodes
- Testing a diode with a meter
- Where diodes are used, and why they matter