1 electron carries 1 negative charge

if we smash the electron into 1000000 equal pieces, each piece will carry 1/1000000 negative charge. Let's call it enertron.

since enertrons carry the same negative charge, they repel each other.

if we have a perfect bottle, which means no leakage, no react, like glass bottle to air. 

we put 1000000 enertrons into the perfect bottle, since enertrons repel each other, they put a pressure on the bottle wall. let's measure and call that pressure 1 vote.

if we put 2000000 enertrons into the same bottle, the pressure on the wall should be 2 vote.

now if 1 enertron is moving or vibrating, the rest all enertrons will share the force according to their distance.

that is the mechanism of light/quantum.

why is energy conserved?

if you push/put a moving force on any enertron with a force f, that force is spreading to all the enertrons in the bottle, they all are moving now, and cannot stop ever ever.

do we have a perfect bottle?

yes, every atom is a perfect bottle. all matters are perfect bottle. energy has nowhere to go but bounce within and between matters.

the forces f=Ke x e1e2/rr and f=G x m1m2/rr are like perfect springs between/within matters, connected all matters in 1.