You Do Need power plug adapter while traveling from United States of America (US) USA to Malta.

Here is Why You Need An Adapter

The outlet and plug type used in Malta is G and in United States of America (US) USA are A and B. This is how they look like.

United States of America (US) USA

In United States of America (US) USA, outlets of type A and B are in use.

Type A

Type B

Malta

In Malta, outlets of type G are in use.

Type G