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Dimenzování vodičů pro 12V halogen

Posted by: admin  :  Category: Žárovky

Je důležité si uvědomit, že malé napětí znamená, že pro stejný příkon svítidla (zdroje) bude třeba více proudu. كيف اربح فلوس Jako příklad si uveďme například 1OOW žárovku na 230 voltů a například 2x50W žárovky na 12V.

Zatímco v prvním případě bude proud cca slabých 0,5 Ampéry, ve druhém případě bude proud přes 8 Amper. Na oboje bude stačit vodič průřezu 1,5 mm2… bet 365 ale zatímco u prvního případu bude úbytek napětí například na vodiči o délce 10 metrů zanedbatelný, tak u druhého případu by se nám již halogenky ani nerozsvítily.

Ztráta napětí na přívodu je dána vzorcem U = R x I…takže v případě halogenek na malé napětí musí být trafo co nejblíže světelným zdrojům, anebo musí příslušně narůst průřez vodiče…což je samozřejmě při dnešních cenách mědi maximálně nákladné.

Takže pokud někdo plánuje dát transformátor na několik set Wattů do rozvaděče a dotáhnout ke všem halogenkám v domě 1,5 mm2 vodič bude dost zklamán, tohle fungovat nebude.

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