Electric Field Strength "E"
What it is
Electric field strength is the intensity of an electric field. Radio waves are composed of an electric component which has a given electric field strength and a magnetic component which has a given magnetic field strength. The power per unit area in a wave front is called Poynting's Vector and is the product of the electric and magnetic fields.

Radio waves and light are electro-magnetic waves.

History
In 1767 Joseph Priestly (1700'33-1804) proposed an electrical inverse-square law.

In 1785 Charles Augustin de Coulomb (1736-1806) introduces the inverse-square law of electrostatics.

Michael Faraday (1791-1867) performed electro-magnetic experiments and conceptualized the prototype of modern electro-magnetic theory. Before Faraday, people conceived of forces acting like the pull of a rope or the push of a stick upon a body. This is called action at a distance. Faraday conceived of fields existing about bodies rather than in bodies, and these fields affecting other bodies. This is called field theory.

James Clerk Maxwell (1831-1879) expressed Faradays ideas in a three dimensional math form. In 1864, Maxwell precisely described radio waves from experiments performed on coils of wire and capacitors. Heinrich Hertz (1857-1894) was able to generate these waves in 1887.

Common equations
electric field strength = force / charge
power per area = electric field strength * magnetic strength
Hertz vector = magnetic vector potential * time / permeability
 magnetic vector potential = electric field * time
Units
volts per meter
volts per inch
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