Question:
The special purpose diode operated / working under forward bias is / are
The special purpose diode operated / working under forward bias is / are
Updated On: Apr 7, 2025
- zender diode and LED
- photo diode and LED
- zener diode and solar cell
- LED
- photo diode
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The Correct Option is D
Approach Solution - 1
A diode works under forward bias when a positive voltage is applied to the anode, allowing current to flow through the diode.
- Zener diode operates in reverse bias, where it allows current to flow in reverse direction when a certain breakdown voltage is reached. Therefore, it does not work under forward bias.
- LED (Light Emitting Diode) works under forward bias, and it emits light when current passes through it.
- Photo diode operates in reverse bias, where it generates current in response to light.
- Solar cell works under reverse bias as well.
Thus, the correct answer is LED, which operates under forward bias.
The correct option is (D) : LED
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Approach Solution -2
The Light Emitting Diode (LED) is a special-purpose diode that operates under forward bias. When forward biased, it emits light due to recombination of electrons and holes in the semiconductor material.
Other special-purpose diodes like:
- Zener diode: typically used in reverse bias for voltage regulation.
- Photo diode: used in reverse bias to detect light.
- Solar cell: operates like a photodiode in reverse bias generating current from light.
✅ Correct Answer: LED
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