George is right of course but it could be a long calculation assuming even that you can get figures for current draw of each component. A while back I came accross a handy gadget in Maplin that is like a mains timer switch that you plug a computer or whatever into and it will measure things like watts, current draw in amps, KWatt hours etc. It was only about L25 or so. Unfortunately it doesn't talk. Here is the page: http://www.maplin.co.uk/Module.aspx?ModuleNo=38343&C=Maplin&U=SearchTop&T=MAINS&doy=17m5 Regards. Tristram Llewellyn Sight and Sound Technology Technical Support www.sightandsound.co.uk ** To leave the list, click on the immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq