INSIDE AN ENERGY-SAVING LIGHT BULB
traditional, or ‘incandescent’ light bulb, as they are properly known, is just a piece of glass with a really thin piece of metal that’s hard to melt inside, usually tungsten. When electricity passes through it, the wire glows, producing the light that fills the room. Think of why a poker turns red when it’s been in a fire and gives off light – that’s pretty much what the inside
