You Do Need power plug adapter while traveling from El Salvador to Falkland Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Falkland Islands is G and in El Salvador are A and B. This is how they look like.

El Salvador

In El Salvador, outlets of type A and B are in use.

Type A

Type B

Falkland Islands

In Falkland Islands, outlets of type G are in use.

Type G