The diode that converts electrical energy into light energy is called:
Correct answer: D. Light emitting diode
- A. Solar cell
- B. Photodiode
- C. Vacuum diode
- D. Light emitting diode
Explanation
The correct answer is the Light Emitting Diode (LED). LEDs are specifically designed to emit light when an electric current passes through them. Unlike solar cells and photodiodes, which convert light energy into electrical energy, LEDs perform the reverse process. A vacuum diode is unrelated to light emission, as it primarily manages the direction of current flow in electronic circuits.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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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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