30 TOP SPECIAL PURPOSE DIODES Questions and Answers pdf SPECIAL PURPOSE DIODES Questions and Answers

Why the current in power diode varies linearly rather

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19. Why the current in power diode varies linearly rather than exponentially with voltage? The large magnitude of current in power diodes leads to ohmic drop that hides the exponential part of the V­I characteristic curve. 20. Explain what is photodiode? Photodiode is a two­terminal semiconductor p­n junction diode device and is designed to operate with reverse bias. 21. How the current is reduced to zero in a photodiode? The reverse saturation current I0 flowing through a photodiode is reduced to zero by applying a forward bias voltage of magnitude eu potential. 22. Photodiode is a photovoltaic device or a photoconductive device or both? Photodiode is a photovoltaic device as well as a photoconductive device. When it is operated with a reverse bias, it is photoconductive when operated without the reverse bias, it is a photovoltaic device. 23. Explain what is meant by LED? LED stands for Light Emitting Diode. 24. Explain what precautions are reuired to be observed in the use of LEDs? LEDs should neither be reverse­biased nor operated near their maximum current rating. The leads of an LED should never be bent cl
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