Why tubelight are much more power efficient than the electric bulb of filament made by tungsten?
Answers
Answer:
The simplee reason behind this is----
The filament in a filament type bulb is made of tungsten. It works on the following principle
- current when passing through the filament turns it into red colour, then yellow and lastly yellowish white, which is the colour of light we get.
In this procedure, extra heating results in most of the power - more than 90%
- getting wasted in the form of heat.
Therefore, they have lower power efficiency. Alternatives to filament type bulbs include halogen bulbs and LEDs.
Explanation:
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps. The typical luminous efficacy of fluorescent lighting systems is 50–100 lumens per watt, several times the efficacy of incandescent bulbs with comparable light output.
Fluorescent lamp fixtures are more costly than incandescent lamps because they require a ballast to regulate the current through the lamp, but the lower energy cost typically offsets the higher initial cost. Compact fluorescent lamps are now available in the same popular sizes as incandescents and are used as an energy-saving alternative in homes.
