You Do Need power plug adapter while traveling from Switzerland to Ethiopia.

Here is Why You Need An Adapter

The outlet and plug type used in Ethiopia are C, F and G and in Switzerland are C and J. This is how they look like.

Switzerland

In Switzerland, outlets of type C and J are in use.

Type C

Type J

Ethiopia

In Ethiopia, outlets of type C, F and G are in use.

Type C

Type F

Type G