Which one of the following does not convert electrical energy into light energy?

A candle does not convert electrical energy into light; instead, it involves a chemical change where chemical energy stored in the wax is converted into light and heat energy through combustion. In contrast, the other options are electrical devices. A Light Emitting Diode (LED) is a semiconductor device that directly converts electricity into light through electroluminescence [2]. A laser (Light Amplification by Stimulated Emission of Radiation) also converts electrical energy into a coherent beam of light. A television set is an electronic device that consumes electrical energy to produce light (via the display panel) and sound [2]. While incandescent lamps and LEDs differ in efficiency and mechanism, they all share the common function of using electrical input to generate light output [4].

Sources

1. [1] https://science.osti.gov/-/media/bes/pdf/reports/files/Basic_Research_Needs_for_Solid-State_Lighting_rpt.pdf
2. [2] https://www.sciencedirect.com/science/article/pii/S1631070518300306
3. [3] Science-Class VII . NCERT(Revised ed 2025) > Chapter 11: Light: Shadows and Reflections > SCIENCE AND SOCIETY > p. 154
4. [4] Science-Class VII . NCERT(Revised ed 2025) > Chapter 3: Electricity: Circuits and their Components > In a Nutshell > p. 37