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

Saudi Arabia

In Saudi Arabia, 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