How Does Electricity Light Up a Bulb?
“Hi, I’m Steve Jones and I’m going to tell you how electricity lights up a bulb. Well, the bulb doesn’t really light up unless there is a coating on it, it is the filament inside which lights up and the filament is made usually of something called tungsten which is a very hard material and last a long time. Eventually the tungsten will wear out, it will burn away and that’s when you say the bulb goes because it bulb burns out it literally burns away. But exactly how does this work? Well, tungsten has resistance. Resistance is the ability of a material to allow or not allow electricity to run through it. If it has a high resistance, then it stops electricity running through it or when the electricity runs through it, it produces a lot of heat. So the tungsten has resistance, it gets very hot but getting hot is no good, we don’t want it how, we want it so hot it starts to glow, it’ll glow red hotter, yellow hotter, white. And when it’s glowing white, it’s producing light. In fact, of the
