In which one of the following devices, the light energy is converted into the electrical energy?
Light-emitting diode
Laser diode
Solar cell
Transistor
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2022
– Light-emitting diode (LED) converts electrical energy into light energy.
– Laser diode also converts electrical energy into coherent light energy.
– Solar cell (photovoltaic cell) is specifically designed to absorb photons from sunlight and convert their energy into an electric current.
– Transistor is a semiconductor device used as an electronic switch or amplifier; it controls the flow of electrical current but does not primarily convert light energy to electrical energy (though some transistors can be light-sensitive, their main function isn’t energy conversion).
Therefore, the solar cell is the device that converts light energy into electrical energy.