Electrical and Electronics 10, Electrical 20, 30, Electronics 20, A30, B30
ELEC25B
Module 25B: Diodes B (Optional)
Outcome
Investigate the properties of diodes.
Indicators
| (a) | Draw diagrams of silicon or germanium material doped with indium, gallium and boron to produce positive (p-type) material. |
| (b) | Draw diagrams of silicon or germanium material doped with arsenic, phosphorus, bismuth and antimony to produce negative (n-type) material. |
| (c) | Explain what happens when n-type and p-type material form a junction. |
| (d) | Explain, with the aid of a diagram, the effect of applying different polarities on a junction. |
| (e) | Test different shaped diodes to determine their anode and cathode. |
| (f) | Interpret meter readings of diodes to check the labeling of the leads. |
| (g) | Draw the schematic symbols for various diodes such as zener diodes, varactor diodes and LEDs. |
| (h) | Explain how diodes with different properties can be used to perform different functions. |
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