How calculate the output power

[Progg70]

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

[wuffwaff]

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

[Progg70]

Thanks for that.