Martin Angove wrote:

Do they have ratings plates in the US?

I'm currently in the US - so I took a look inside the microwave oven.
The plate reads -

Input 120v 60hz 15 or 20 amp 3-wire only
Output 650 watts 2450mhz 11 amp

It's an old unit, the label says it was manufactured in January 1989.

I don't remember the rating of the one we have in Scotland, but it cooks
faster than this one.

Sheila