You Do Need power plug adapter while traveling from Faroe Islands 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 Faroe Islands are C, E, F and K. This is how they look like.

Faroe Islands

In Faroe Islands, outlets of type C, E, F and K are in use.

Type C

Type E

Type F

Type K

Puerto Rico

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

Type A

Type B