One of the features, and one of the disastrous features, of modern society, is that, in our laziness, we depend upon prodders and encourage a vast system of prodding.

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?  

The answer is conduction

English , i don't understand spanish.