Energy Flow Diagram, Converting Electrical Energy to Heat to Light
- Take the case of a filament lamp ( which was used in early days because now a days these are replaced by LEDs ).
- Such diagrams are very simple, input-losses output.
- These diagrams are developed by a scientist “Sankey”, so these diagrams are also called as Sankey diagrams.
- Electrical energy input = 400 J.
- Heat energy is a waste energy = 327 J.
- Useful energy as a light energy only = 75 J.
Studying these flow diagrams, new versions of lamps are developed in which case heat energy is reduced and output light energy is much more.