Re: [Phys-l] How much energy can a battery discharge

[Brian Whatcott <betwys1@sbcglobal.net>]

At 11:01 PM 10/23/2008, you wrote:
>  How much energy can a Battery Hold? Can I just divide grams-moles by
>  Coulumbs?
>
> 1 Coulumb = 6.2 x 10^18 electrons or 1 A / sec
> Avogadro's number = 6.02 x 10^23 gram-moles
>
> Coulumbs for a gram-mole = 6.02*10^23 / (6.2*10^18)
>                        = 97096.77419
>
> Divide by 60*60 to get amp hours = 26.97132616
>
> Therefore something the size or mass of a sugar cube, could give about
> 27 amp hours on the negative terminal.
> --
>   paul beach
>   sniffyraven@fastmail.fm


Let's see: you are proposing that every molecule donate an electron.
A Coulomb is a measure of the number of charge carriers passing a point
often given as one ampere-second. Extracting one electron from a mass
provides a motivation for one electron to be returned to that mass.
The electric force grows large with a greater imbalance of electrons,
so I don't suppose that amount of charge can be extracted without a major
expenditure of energy. They don't leave willingly, you could say? :-)



Brian Whatcott    Altus OK    Eureka!