Answer: Light to electrical energy.
- A Electrical to light energy
- B Light to electrical energy
- C Heat to electrical energy
- D Mechanical to electrical energy
Correct answer: B. Light to electrical energy
Explanation: Solar cell (photovoltaic cell) converts light (photon) energy to electrical energy using photoelectric effect in p-n junction.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.