Today’s bulbs predominantly use tungsten filaments, a shift from the carbon filaments of the past. Tungsten, introduced in the early 20th century, has a higher melting point, which allows for ...

Light bulbs are one of those circuit elements we pretend are perfect, but they aren’t. Tungsten filaments have a low resistance when cold, which causes a bulb to draw a lot of current when it ...

Instead of old halogen-filled bulbs, new LEDs and even laser lights promise better illumination. Read more at ...