Question

what is primary & secondry energy source?

Answer 1

energy obtained a directly is known as primary energy like sun where as the energy which is obtained from source is known as secondary energy like electical energy ,

Answer 2

Hydrogen sulphide is the primary energy source in deep sea and bacteria uses chemosynthesis process to produce energy which does not need sunlight.

A secondary energy source is one that is made using a primary resource. Electricity issecondary resource, and can be generated by a number of different primary sources.