How calculate the output power
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 19th October 2005, 11:16 AM #1 Progg70   diyAudio Member   Join Date: Jul 2004 Location: Sweden How calculate the output power I'm curious! Please give me the formula for the output power for power amplifiers. I'm looking for the formula for: Single-end class A Ordinary Class A Class AB Regard Progg70
 19th October 2005, 11:31 AM #2 wuffwaff   diyAudio Member     Join Date: Aug 2001 Location: Ingolstadt Germany Hi, "the formula" is always the same: P = I*I*R = V*V / R = V*I The only things you need to know is how much current your amp can deliver, how much voltage your amp can deliver and what the impedance of the load you´re using is. If you know peak current and peak voltage then rms power is: Prms = Ip * Vp / 2 This power is only dumped into the fitting load R = Vp/Ip. When R gets bigger the output is voltage limited an dpower will go down. Here you can use P=V*V/R When R gets smaller the output is current limited and power will go down. Here you use P = I*I*R Note that this has nothing to do with how much power the amp will draw out of the mains. William __________________ een ooievaar is geen konijn want zijn oren zijn te klein!
 19th October 2005, 04:57 PM #3 Progg70   diyAudio Member   Join Date: Jul 2004 Location: Sweden Thanks for that.

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