You Do Need power plug adapter while traveling from Philippines to Guyana.

Here is Why You Need An Adapter

The outlet and plug type used in Guyana are A, B, D and G and in Philippines are A, B and C. This is how they look like.

Philippines

In Philippines, outlets of type A, B and C are in use.

Type A

Type B

Type C

Guyana

In Guyana, outlets of type A, B, D and G are in use.

Type A

Type B

Type D

Type G