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Pastimes : Dream Machine ( Build your own PC ) -- Ignore unavailable to you. Want to Upgrade?

To: Howard R. Hansen who wrote (10109)	1/31/2000 12:40:00 AM
From: Dan Duchardt	Read Replies (2) \| Respond to of 14778

Good catch Howard, If I might probe a little deeper into your original reply, the capacitor in PW's question would have been something near the output of the UPS, not a device to store the large amount of energy the UPS might have to deliver when the power fails. In addition to a higher energy/$, batteries maintain a relatively constant voltage as energy is drawn off until they become nearly depleted, while capacitors lose voltage in proportion to the amount of charge delivered as current into a connected circuit. A typical automobile battery is rated at about 60 amp-hours, or 21600 amp-seconds (coulombs). A capacitor that could store that much charge at 12 volts would be 21600/12 = 18000 Farads. Now that would be something worth seeing. I once had an old 2 Farad capacitor. It was about the size of a car battery. Dan