I don't know about the rest of the world, but within the EU there is a very definite requirement that all appliances sold are marked with a plate that contains information about the voltage and maximum consumption in Watts (not the current draw in amps)
This is often INSIDE the appliance!
i.e. on ovens, it's commonly written inside the main oven door, either beside the seal or under the glass.
On washing machines, dryers and dishwashers it's also often printed inside the door of the appliance.
Not sure why this is now the norm rather than putting it on the back near the cable entry.
