The especially designed semiconductor diodes used as indicator lamps in electronic circuits are___________?
Correct answer: B. The light emitting diode
- A. The switch
- B. The light emitting diode
- C. The photo diodes
- D. Solar cells.
Explanation
A light-emitting diode produces light when electrons and holes recombine at a forward-biased junction and release energy as photons. A photodiode detects light, while a solar cell converts light into electrical energy, so neither is primarily an indicator lamp. The likely mistake is choosing a photodiode because both devices involve light.
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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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