Science Behind Light Bulbs
Incandescent light bulb:
light bulb is a simple apparatus that converts electric energy into light energy. It was invented in the late 1800s . The incandescent light bulb is made of a positive and a negative terminal along with the tungsten filament that is wrapped inside an insulating glass that contains inert gas to prevent the filament from getting too hot and breaking the glass. Tungsten metal has been chosen for light bulbs for its amazing characteristics. First, it has a very high melting point of 3500 Celsius degrees, low vapor pressure and great tensile strength. When the bulb is connected to a power supply, the electrons travel along the circuit and bump into the filament causing them to vibrate. The atoms heat up to 2.200 Celsius degree and finally delight. That’s why you should be careful when you touch a lighting bulb.
Fluorescent light bulb:
Fluorescent bulbs are gas filled tubes with electrodes at its ends. When electrons of the electric current hit mercury atoms in the gas. Collisions occurring make the atoms more excited. that causes the atoms to emit ultraviolet light. The white phosphor coating on the inside of the tube absorbs ultraviolet light and re-emits it as a visible light.
"I have not failed. I've just found 10,000 ways that won't work." - Thomas Edison
Written by: MAHMOUD ELSHAZLY