izzólámpával

The izzólámpa, commonly known as an incandescent light bulb, is a type of electric lamp that produces light by heating a filament until it glows. This filament is typically a thin wire made of tungsten, enclosed within a glass bulb that is either evacuated or filled with an inert gas to prevent the filament from burning up. When an electric current passes through the filament, its electrical resistance causes it to heat up to a high temperature, emitting visible light.

The principle behind the izzólámpa was first demonstrated by Humphry Davy in 1802, but practical and long-lasting incandescent bulbs were developed later by inventors like Thomas Edison and Joseph Swan in the late 1870s. Edison's key innovations included a high-resistance filament, a highly evacuated bulb, and a practical socket and power distribution system, which led to the widespread commercialization of the incandescent lamp.

Despite their ubiquity for over a century, izzólámpák are relatively inefficient compared to modern lighting technologies such as LED or fluorescent lamps. A significant portion of the energy consumed by an incandescent bulb is dissipated as heat rather than light. Due to this inefficiency and increasing environmental concerns, many countries have begun phasing out the use of incandescent bulbs in favor of more energy-saving alternatives. The characteristic warm, yellowish glow of an izzólámpa, however, is still appreciated by some for its aesthetic qualities.