Re: Joules - Vrms or Vp (fwd)

• To: tesla-at-pupman-dot-com
• Subject: Re: Joules - Vrms or Vp (fwd)
• From: Tesla List <mod1-at-pupman-dot-com>
• Date: Mon, 3 Aug 1998 20:00:51 -0600 (MDT)
• Approved: mod1-at-pupman-dot-com

---------- Forwarded message ----------
Date: Sun, 2 Aug 1998 21:24:02 -0700
From: Jim Lux <jimlux-at-earthlink-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Joules - Vrms or Vp (fwd)


> Date: Mon, 27 Jul 1998 18:30:28 -0500
> From: "Barton B. Anderson" <mopar-at-uswest-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Joules - Vrms or Vp
> 
> To List,
> 
> Regarding the calculation for Joules..... J = 1/2 x C x
> V^2.
> 
> Should V = Vp or should V = Vrms? Why? (if you know).

Vpeak.. rms refers to a time average (essentially the heating value of the
signal), more formally, it is the square root of the mean of the square, or
the integral of the square divided by the interval. For a sinusoid, rms =
sqrt(2) pk. For a square wave (bipolar NRZ) rms = pk.

Energy, otoh, is the stored energy, and would refer to a single instant in
time, i.e. that when the energy is at a peak.

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