Electricity in Ireland
Do you need a voltage or frequency converter?
While the US uses power sockets types A and B with a standard voltage of 120 V and frequency of 60 Hz, in Ireland you will type G sockets that passes electricity through at 230 V and 50 Hz.
Check your appliances to see what the voltage and frequency are.
If the label states 'INPUT: 100-240V, 50/60 Hz' the appliance can be used in all countries in the world. This is common for chargers of tablets/laptops, photo cameras, cell phones, toothbrushes, etc.
While you will definitely need a plug adaptor, if your electronics are not universal, look for a combination power plug adapters/voltage converter that also changes the frequency.