Which of the following uses a reverse biased diode?
Correct answer: C. Photodiode
- A. Rectifier
- B. Photocell
- C. Photodiode
- D. Light Emitting Diode (LED)
Explanation
The correct answer is Photodiode. Photodiodes are designed to operate under reverse bias, which enhances their sensitivity to light by widening the depletion region and allowing more efficient light detection. This reverse bias mode is critical for their function as light sensors.Other options do not primarily use reverse-biased diodes:Rectifiers utilize diodes in forward bias to convert alternating current (AC) to direct current (DC).Photocells, or solar cells, create current from light exposure without specific bias configurations like those used in photodiodes.Light Emitting Diodes (LEDs) are designed to emit light when forward biased, relying on the recombination of charge carriers.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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