You Do Need power plug adapter while traveling from Equatorial Guinea 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 Equatorial Guinea are C and E. This is how they look like.

Equatorial Guinea

In Equatorial Guinea, outlets of type C and E are in use.

Type C

Type E

Chad

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

Type C

Type D

Type E

Type F