A diode is a device that has very low resistance in one direction and a very high resistance in the other direction.
- If a potential difference is applied across a diode in the direction with low resistance, it is said to be forward bias.
- If a potential difference is applied in the direction with very high resistance, it is said to be reverse bias.
- If the reverse bias potential difference is too high, a diode may break down and the current becomes infinite, resulting in a short circuit.
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