You Do Need power plug adapter while traveling from South Sudan to Puerto Rico.

Here is Why You Need An Adapter

The outlet and plug type used in Puerto Rico are A and B and in South Sudan are C and D. This is how they look like.

South Sudan

In South Sudan, outlets of type C and D are in use.

Type C

Type D

Puerto Rico

In Puerto Rico, outlets of type A and B are in use.

Type A

Type B