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Lampa żarowa

Lampa żarowa

Lampa żarowa

Żarówka, czyli inaczej lampa żarowa, jest zasilana energią elektryczną. Elementem świecącym jest żarnik wykonany z wolframu, który pod wpływem przepływu prądu elektrycznego rozgrzewa się do bardzo wysokiej temperatury.


Rozżarzony przewód świeci w wyniku promieniowania cieplnego. We wnętrzu szklanej bańki panuje próżnia, choć częściej jest ono raczej wypełnione mieszaniną gazów. W świetle zwykłych żarówek - podobnym do światła słonecznego - bez większych przekłamań można obserwować prawdziwe kolory.

Żarówka, pomimo częstotliwości napięcia wynoszącego 50Hz, nie powoduje efektu stroboskopowego i świeci cały czas jednakowo. Temperatura barwna żarówki jest nieco niższa niż temperatura barwna słońca, co oznacza, że jest ono bardziej żółte. Najwięcej energii żarówka zużywa do emisji ciepła, co jest jej niewątpliwą wadą.