I recently bought a NutriBullet which has an EU plug on it. The plug says 16a 250v.
I have an adapter to use it in the uk but it says 13a on it. Can I plug it in and use it with the adapter? I can’t find any adapters with more than 13a.
I would chop off the EU plug and fit a classic 13A UK plug to the cable. This has the advantage that the UK plug is fused and you can fit a more appropriate fuse for the size of the appliance.
I do this for items I take to Switzerland and for items I bring back.
Neither country has items that take more power than 13A so it's fine, I do check the wattage stated on the device but monitors, fans, kitchen blenders etc are lower than 13A in terms of actual use. The one I would be worried about is my big welder but that won't be moving anyway.
The most powerful Nutribullet I can find online uses about 1700 Watts.
That's absolutely fine on a UK 13A circuit. In broad terms, 3kW [3000 watts] is considered a safe maximum on a regular socket with nothing else in the same socket [no extension leads etc].
Make sure the adapter is a firm fit - no wobbles, no sparks. If not, replace the plug with a proper UK 13A.
The rating stamped on a plug is the rating of the plug. It does not represent the rating of anything else.
The appliance should have a plate or sticker indicating its requirements. Most appliances will be fine with the slightly lower rated UK plug, but you do need to check.
If more than 13A is needed, then you can't use a normal UK socket and other arrangements would be needed to supply the appliance.
For permanent use in the UK, replacing the plug is preferable to using an adapter, there are less connections to go wrong and less stress is placed on the socket since the correct a plug is smaller and lighter than a combination of plug and adapter.
If you do use an adapter make sure you get the right adapter. That means the adapter should be.