I recently bought an extension lead to power my PC, monitor, printer and desk lamp. But I would like to ask for an advice because I don't know whether only a 10A extension lead is able to handle all those devices. Also, my PC has a 500W PSU inside and it says 13A on the lead from the PSU cable. The only thing I know is that devices don't always take maximum current which should be known as amps (correct me if I'm incorrect). Is there a calculation which will allow me to check if I'm exceeding the voltage or whatever (didn't pay much attention on physics lessons). And also is it fine to plug in a 13A device into a 10A socket? Otherwise, what should I do with the extension lead as I can't just bin it? Thanks.