A system's overall energy is lower after an energy transformation than it was before.
Energy is a phrase used to describe an property of matter or non-matter fields; it is not a substance in and of itself. For instance, it is argued that matter has kinetic energy when it moves quickly. Potential energy can take many different forms.
The energy is produced as electrons transfer from one element to another. Energy also includes heat and light. You can change one type of energy into another. Chemical energy is converted to electric energy through a battery.
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