Question
Which is true about forward voltage drop in a diode?
Answer Options
- A) It is lower in some diode types than in others
- B) It is proportional to peak inverse voltage
- C) It indicates that the diode is defective
- D) It has no effect on the power dissipation of the diode
Correct Answer: A
Explanation
A diode only allows current to flow easily in one direction. When current is flowing (forward biased), there is a small, constant forward voltage drop across the diode. This drop is an inherent characteristic of the semiconductor material used, not a defect.
The statement that is true is that the forward voltage drop is lower in some diode types than in others. For instance, silicon diodes typically have a drop of about 0.7\text{ V}, while Schottky diodes (used for high speed switching) have a lower drop, sometimes down to 0.2\text{ V}. This voltage drop does cause the diode to dissipate power in the form of heat (P=E\times I).
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