Providing the power required to run production equipment is an example of unit-level activity. Why is it not for a batch-level activity or product-level activity since both will require power? Please...

Providing the power required to run production equipment is an example of unit-level activity.
Why is it not for a batch-level activity or product-level activity since both will require power?

Please explain in detail by giving some examples of other activity levels (batch and product).