When a semiconductor diode is forward biased, what happens to the resistance of the diode?

JAMB Physics 2023 305 views
Source: JAMB · 2023

When a semiconductor diode is forward biased, what happens to the resistance of the diode?

  1. The resistance increases.
  2. The resistance decreases. ✓
  3. The resistance remains constant.
  4. The resistance can either increase or decrease, depending on the doping level of the diode.
Explanation

Forward bias narrows the depletion region, so charge carriers cross the junction easily. Once the voltage passes the threshold, current rises sharply.

This means the diode’s resistance decreases. In reverse bias the resistance is very high.

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