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

Here is Why You Need An Adapter

The outlet and plug type used in Chad are C, D, E and F and in Ireland (Eire) is G. This is how they look like.

Ireland (Eire)

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

Type G

Chad

In Chad, outlets of type C, D, E and F are in use.

Type C

Type D

Type E

Type F