Discussion
The transducer which generates electrical power
Answer: C
A solar cell is a transducer that generates electrical power: it is a photovoltaic device that converts incident light directly into a voltage and current without an external supply. A photoconductor changes its resistance under light, and a photodiode and a phototransistor are normally used with an external bias to give a current that varies with light, so these are not power-generating transducers in the sense the question asks. The answer is option C.
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