What are the sources of energy that are common in life and the two energy sources
Primary energy refers to the energy and resources directly from the natural world that have not been processed and converted
The two energy is converted into the form of energy. For example, if coal is used directly to burn, we are using the primary energy. If coal is used to generate electricity, the electricity generated is the two energy.
The energy product obtained after the primary energy is processed and converted is called the two energy source, such as electricity, diesel oil, gasoline, etc.
