Energy
A measure of a physical arrangement that describes how much of one thing happening can exchange for another thing happening.
Accessibility
Certain arrangements more easily lead to a desired thing happening. When heat is desired, the chemical potential energy of wood is more accessible than the gravitational potential energy of a elevated rock.
Food
The things we want to do with our bodies (sensing, thinking, moving, etc.) require energy in the form of food.
Electricity
The things we want to do with electronic tools require energy in the form of electricity. Electricity is so important that in most contexts it is referred to as energy simply.
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