Question

Coal is a primary source of energy but petrol is a secondary source.why?

Answer 1

Answer:

Crude oil, coal, wind and natural gas are all primary energy sources. ... Most of the world's primary energy (~95%) comes from fuels, most of which are fossil fuels, see figure 1. This means that most of the world's energy supply emits carbon dioxide when it undergoes combustion in order to extract the energy.

These are fuels that are not found as a natural resource. The energy for these secondary fuels comes initially from primary energy sources. Gasoline is the best example of a secondary fuel, as it must be made from oil through distillation processes.

Answer 2

coal is a primary source as it is used directly but petrol is made by the transformation of primary source so it is secondary source