What is the advantage of an LED bulb over the filament electric bulb?

Question

TextSemiconductor Electronics Overview

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State the working principle of an LED. Write any two important advantages and two disadvantages of LED.

Give a relation between α and β for a transistor. (Derivation is not required.)

Semiconductor Electronics Overview

Draw a labelled circuit diagram of a transistor acting as a common emitter amplifier. What is meant by phase reversal?