sähkölamppu

Sähkölamppu, commonly known as an electric lamp, is a device that produces light by passing an electric current through a filament. This filament, typically made of tungsten, heats up to incandescence, emitting light. The filament is enclosed in a glass bulb filled with an inert gas or a vacuum to prevent it from oxidizing and burning out quickly.

The invention of the practical incandescent light bulb is widely attributed to Thomas Edison, although many inventors contributed to its development. Edison's breakthrough in the late 1870s involved finding a durable filament material and creating a highly efficient vacuum within the bulb, leading to a commercially viable product. Early bulbs had short lifespans and were expensive, but continuous improvements in materials and manufacturing processes led to longer-lasting and more affordable electric lamps.

Over time, various types of electric lamps have been developed beyond the incandescent bulb. These include fluorescent lamps, which use a phosphor coating and mercury vapor to produce light, and LED (Light Emitting Diode) lamps, which utilize semiconductor technology to generate light with high energy efficiency and long lifespans. Each type of sähkölamppu has its own advantages and disadvantages in terms of efficiency, color rendering, lifespan, and cost. The widespread adoption of electric lighting revolutionized society, extending working hours, improving safety, and transforming urban and domestic life.