You Do Need power plug adapter while traveling from Northern Ireland 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 Northern Ireland is G. This is how they look like.

Northern Ireland

In Northern Ireland, 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