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Re: Joules - Vrms or Vp (fwd)
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To: tesla@pupman.com
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Subject: Re: Joules - Vrms or Vp (fwd)
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From: Tesla List <mod1@pupman.com>
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Date: Tue, 28 Jul 1998 21:07:12 -0600 (MDT)
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Approved: mod1@pupman.com
---------- Forwarded message ----------
Date: Tue, 28 Jul 1998 21:26:20 -0700
From: "Antonio Carlos M. de Queiroz" <acmq@compuland.com.br>
To: Tesla List <tesla@pupman.com>
Subject: Re: Joules - Vrms or Vp (fwd)
Barton B. Anderson wrote:
> Regarding the calculation for Joules..... J = 1/2 x C x
> V^2.
>
> Should V = Vp or should V = Vrms? Why? (if you know).
These are all instantaneous values. If you use V=Vpeak you
have the maximum energy in the capacitor. If you use V=Vrms
you get one half of the maximum energy, for a sinusoidal
signal. If you are using this formula to compute the maximum
energy per break in a primary circuit with the capacitor
charged by a transformer (without resonant charging), use
the peak value of the transformer output voltage.
Antonio Carlos M. de Queiroz