Sum of all the energies associated with the individual molecules/atoms comprising a substance.

Internal Energy

Energy involving the movement of a physical object as a whole.

Mechanical Energy

Energy cannot be created nor destroyed. Energy is transferred through heat or work. The formula is ΔEtotal = Q + W (Where Q is heat and W is work).

Conservation of Energy

Electric potential is measured in volts and it is the difference required to bring one unit of infinite electric charge to a particular point. 

Electric Potential

A property that must be transferred to perform some work or heat something up.

University of Michigan - Ann Arbor

Focuses of Physics

Wikipedia

Energy

A system composed of many distributed elements whose aggregate properties cannot be predicted by observing the behavior of an element. Furthermore, the observable manifestations or 'forms' of a complex system may only represent superficial aspects, with its true 'essence' or fundamental nature remaining hidden or less apparent beneath the surface.

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