The plug fits the adapter and the adapter fits the hotel socket. That establishes a mechanical connection, not that the electrical supply suits the appliance. A travel adapter and a voltage converter do different jobs.
Make the check before packing, when you can read the manufacturer’s instructions and choose suitable equipment without pressure. The hotel reception desk should not have to become the testing ground for an uncertain electrical combination.
Read the input label
Look at the appliance or its power supply for its rated input voltage and frequency. Do not confuse the output rating of a charger with the supply it accepts. If the label is unclear, consult the manufacturer’s documentation rather than guessing from the plug shape.
Electrical Safety First’s travel-adapter guidance explains that ordinary adapters do not convert voltage or frequency. It also highlights issues such as earthing and power ratings. Check the requirements of your particular device and destination.
Check the combination, not just each item
A device that accepts the local supply still needs an appropriate, undamaged adapter with a suitable rating and any required earth connection. High-power appliances deserve particular care. Do not assume that an adapter suitable for a small charger is automatically suitable for a hairdryer or travel kettle.
If a voltage converter is needed, compatibility depends on more than buying any box labelled “converter”. Seek manufacturer or qualified advice about the complete arrangement. Leaving an unsuitable appliance at home may be the simplest decision.
Inspect the socket before using it
Do not use a loose, damaged, scorched or wet outlet. Report the problem to the accommodation provider and ask for a safe alternative. Never force a plug, remove an earth pin or stack improvised adapters to make something fit.
Also follow the hotel’s rules. A socket in a bathroom or one labelled for a specific purpose is not a general invitation to connect any appliance. Keep charging equipment away from bedding and other conditions prohibited by the manufacturer.
Make the packing list specific
Write down the device, its accepted input, the required plug arrangement and whether the hotel already supplies a suitable alternative. A photograph of a clear rating label can help when checking documentation later.
The useful travel kit contains equipment you understand. “It worked on my last trip” is weaker evidence than confirming that this device, this adapter and this supply belong together.