non LINEAR+-*/ Posted August 20, 2010 Share Posted August 20, 2010 haloo all here is my question " Why few capacitors are engraved with polarity and they get blast when i reversed the polarity of supply potential whereas few other capacitor will work in AC too ?" Thanks in advance .... by non LINEAR+-*/ Link to comment Share on other sites More sharing options...
Danijel Gorupec Posted August 24, 2010 Share Posted August 24, 2010 Some capacitors (electrolytic capacitors) must be polarized in normal work - this is purely because of technology used inside them to separate two 'plates'. In an electrolytic capacitor one plate is a fluid (electrolyte), the other plate is metal (aluminum, tantalum) and the insulator in between is the metal-oxide layer. If you reverse the polarity, for some reason (beyond my complete understanding - I should learn chemistry better) the insulator layer gets destroyed and the capacitor gets short-circuited. Link to comment Share on other sites More sharing options...
netrat Posted September 22, 2010 Share Posted September 22, 2010 Some capacitors (electrolytic capacitors) must be polarized in normal work - this is purely because of technology used inside them to separate two 'plates'. In an electrolytic capacitor one plate is a fluid (electrolyte), the other plate is metal (aluminum, tantalum) and the insulator in between is the metal-oxide layer. If you reverse the polarity, for some reason (beyond my complete understanding - I should learn chemistry better) the insulator layer gets destroyed and the capacitor gets short-circuited. Capacitor blasts because electrolysis of fluid takes place producing gases inside electrolyte capacitor. This normally happens when you connect electrolyte capacitor to DC closed circuit. I Loved blasting capacitors from my dad's broken PC motherboards, when i was small. LOL Link to comment Share on other sites More sharing options...
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