James C. Maxwell Quotes
In speaking of the Energy of the field, however, I wish to be understood literally. All energy is the same as mechanical energy, whether it exists in the form of motion or in that of elasticity, or in any other form. The energy in electromagnetic phenomena is mechanical energy.
Maxwell, James Clerk. "A Dynamical Theory of the Electromagnetic Field." The Scientific Papers of James Clerk Maxwell, edited by W. D. Niven, vol. 1, Cambridge University Press, 1890, p. 564.
James Clerk Maxwell FRSE FRS was a Scottish scientist in the field of mathematical physics. His most notable achievement was to formulate the classical theory of electromagnetic radiation, bringing together for the first time electricity, magnetism, and light as different manifestations of the same phenomenon. Maxwell's equations for electromagnetism have been called the "second great unification in physics" where the first one had been realised by Isaac Newton.