Because we need a bad conductor to transform the electrical energy into light and heat. A good conductor simply conducts the electricity across, that's about it. But a bad conductor resists the flow of electricity. read more
Pure tungsten has some amazing properties including the highest melting point (3695 K), lowest vapor pressure, and greatest tensile strength out of all the metals.Because of these properties it is the most commonly used material for light bulb filaments. read more
Filaments in light bulbs, specifically incandescent bulbs, are made of tungsten because tungsten has a high melting point and is able to withstand heat and corrosion. Tungsten is one of the most durable types of filaments used in light bulbs. read more