You Do Need power plug adapter while traveling from Ghana to Cambodia.

Here is Why You Need An Adapter

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

Ghana

In Ghana, outlets of type D and G are in use.

Type D

Type G

Cambodia

In Cambodia, outlets of type A, C and G are in use.

Type A

Type C

Type G