Re: YOU THINK YOU KNOW, BUT DO YOU?

From: Sean Leistico (sleistico_at_kc.rr.com)
Date: 03/13/05 

Date: Sat, 12 Mar 2005 19:50:17 -0600

I learned it in Stagecraft class decades ago.

Ol' Mr. Peerbolte called it the West Virginia formula

The abbreviation for West Virginia (before two-letter postal codes) was W.Va

W VA

Watts = Volts x Amps

Algebra will give you the corrolaries for finding Volts or Amps

I know this formula is accurate for AC, and I'm assuming DC--can anyone give
confirmation on that?

"Robert Monsen" <rcsurname@comcast.net> wrote in message
news:QeKdnbP6o7uFU63fRVn-sA@comcast.com...
> Dave wrote:
> > Getting the 17 amps is what I was asking. What is this equation?
> >
>
> The forumula is Power = DC current x DC voltage.
>
> So,
>
> 200W/12V = 16.66A
>
> However, that assumes your converter is 100% efficient, which it is not.
> So, say it's 70% efficient, then
>
> 200W / 0.70 = 286W, so 286/12V = 23.8 A
>
> --
> Regards,
> Robert Monsen
>
> "Your Highness, I have no need of this hypothesis."
> - Pierre Laplace (1749-1827), to Napoleon,
> on why his works on celestial mechanics make no mention of God.