You Do Need power plug adapter while traveling from Czech Republic to Ireland (Eire).

Here is Why You Need An Adapter

The outlet and plug type used in Ireland (Eire) is G and in Czech Republic are C and E. This is how they look like.

In Czech Republic, outlets of type C and E are in use.

Type C

Type E

In Ireland (Eire), outlets of type G are in use.

Type G

I am from

going to