Yes you need an adaptor to change from a 2 pin input to a 3 pin input and transform from the standard 110v used in America to the 220v used in Ireland. These arent too expensive and can be bought in many airports and supermarkets.
Yes. The electrical system and the plugs are different in Ireland than in America, so you will need one.
Yes, but you will need an adapter to plug it in as the electrical system is different in Ireland.
You have to carry your chargers if you are travelling for long time. The electrical sockets in Canada and USA are identical hence you will not need travel adapters. The domastic electricity also has same voltage in USA and Canada.
You will need a different type of plug than what is used in the US or an adapter to plug into a socket. If you have those then it will work. Some countries, like Britain and Ireland, use different plug sockets than other countries, so you need to know what you need for where you are going. You can buy the adapters in good electrical shops, department stores or at shops in airports.
You need no adapters.
You would need to find and install adapters to the hubs.You would need to find and install adapters to the hubs.
Yes.
The power adapter need 230v, 50Hz supply
Yes, it does. You need wireless adapters as well as at least on router.
No. Some computer speakers require AC adapters, while others can run simply on battery power or USB.
Electrical devices need an electrical circuit.
Yes, they do. Some people use older computers that need it installed though.
You need an adapter to plug your plug into, which will then plug into the sockets in Europe. Be aware that the sockets in Britain and Ireland are different to the sockets in much of the rest of Europe, so you need to know where you are going. All airports sell the adapters, as do many large shops, so you can get advice on which to buy there.