I have been reading a book about electricity which states that: electric current is not the movement of electrons but the "impulse generated when free electrons orderly "jump" from one atom to the other. On some other topic of the book it also states that, electrons lose energy when they move through loads.
I really do not understand how the impulse phenomenon takes place in a conductor. Could anyone elucidate me on the subject?
Secondly, what signs electrons present when they lose energy?