You Do Need power plug adapter while traveling from Puerto Rico to Czech Republic.

Here is Why You Need An Adapter

The outlet and plug type used in Czech Republic are C and E and in Puerto Rico are A and B. This is how they look like.

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

Type A

Type B

In Czech Republic, outlets of type C and E are in use.

Type C

Type E

I am from

going to