You Do Need power plug adapter while traveling from Bahamas to Tanzania.

Here is Why You Need An Adapter

The outlet and plug type used in Tanzania are D and G and in Bahamas are A and B. This is how they look like.

Bahamas

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

Type A

Type B

Tanzania

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

Type D

Type G