How does gravity relate to energy if gravity is a funtion of mass and mass/matter just a function of energy within the EM spectrum?

No. Gravity has nothing to do with charge. Both matter and energy create gravity. Gravity is still there even if no electric charges are present.

No. Electricity, magnetism, electromagnetism and gravity are 4. different forms of energy. There are different kinds if energy. A mass has potential energy that becomes kinetic energy as the mass falls toward a larger mass. The plane that is not moving on the ground has potential energy. When the plane crashes, ALL potential energy of the mass of the plane and contents are kinetic energy when the engines fail.

Light, electromagnetism, has energy.

E = mcc = hv

E = energy

m = mass

c = speed of light IN A VACUUM

h = Planck constant

v = frequency, NOT velocity.

No, no, and more no.

In general relativity, gravity is generated from all forms of energy/momentum, not just the energy content of mass. Photons have both energy andmomentum and therefore generate a gravitational field. Normally, their gravity is extremely small since the energy/momentum of photons is much smaller than the energy content of mass. Specifically, the source of gravity is called the stress-energy tensor (also called energy-momentum tensor). There is a stress-energy tensor for both matter and also fields such as the electromagnetic field.