Here’s a quick tip.
Hotels in some countries can offer power sockets of varying voltages in the same room which may leave you scratching your head as to which one to use before you’ve even cracked out the adapters.
Well, it’s pretty simple – use the socket that provides the maximum voltage compatible with the device(s) you will plug into it. You can usually find the supported voltage(s) on the power brick but many will support the 100-240V range and take care of the rest for you. Read carefully though as while you can use an adapter to get a device to plug into a power socket and solve the physical challenge you may damage devices that receive more voltage than they are designed to accept – be careful!