Re: [Phys-l] cars and physics

[brian whatcott <betwys1@sbcglobal.net>]

On 2/23/2011 11:14 AM, Bill Nettles wrote:
> /snip/
> There has been much experimentation on 42 volt DC elec. systems but the problem seems to be arcing when switches or relays open to stop current flow.  Eats up contact points. /snip/            Pete, Sr.


It's surprising to notice how a switch rated for both AC and DC gets to 
handle much less power on DC than AC.

At some point, there is an inducement for vehicles to carry AC busses.
I guess that's a break point at a size bigger than the average car 
though....

Brian W