More than 100 years ago, the conversion of electrical energy to light was demonstrated in laboratories as by English scientist Humphry Davy. Since then, there have been several contributors leading to today’s modern light bulb. In a normal incandescent lamp, the filament is made of tungsten metal and surrounded by a nonreactive “inert” gas such as argon. Electricity flows through the thin tungsten wire in the light bulb called the filament. The filament used in a bulb has a property called “resistance.” Resistance is the amount of friction that an object will put against electricity flowing through it. As we read in Wiki Junior, as a result of this, the filament heats up and starts glowing, converting electrical energy to light energy. This is because of the Joule-effect, which means that resistances heat up when electrical current runs through them. More more reading on how light bulbs work, we can find out how Rudolph’s Nose lights up so bright: https://en.wikibooks.org/wiki/Wikijunior:How_Things_Work/Light_Bulb.
Merry Christmas Everyone!