[In order to understand this article, it is advised to read first :

http://www.journaloftheoretics.com/Articles/2-3/JGhitis-pub.htm ]

There is no alternating electricity in nature. It is artificially generated from kinetic energy by means of generators. Thus, there is only direct electricity in nature. Direct electricity may be also generated artificially by chemical means.
Alternating current has a "live" wire from which the artificially generated electrical energy flows. The other wire serves to conduct the current back to the generator, in a very loose sense, because actually the energy goes on to the nearest freely moving electrons in the ground. The fact that the shape of the current alternates is what prevents this artificially generated electricity from acting as "direct," even though the flow is in a single direction.

Aside from the direct current flow in living organisms, the direct electricity present in nature is static ('electrostatic'). It becomes flowing for a very short time when it becomes powerful enough to ionize the surrounding gases, becoming then able to apparently "jump." Due to the partial resistance offered by the conducting medium, a sudden electric flow in the atmosphere is marked by intense heat and its explosionlike consequenses known as lightening and thunder. The atomic nucleus contains in each proton one extra --"orphan"-- positron; therefore the is "positively" charged. This positron is balanced by one electron moving around the nucleus. Positrons and electrons spin in opposite directions. The primal energy that gave rise to the spin is the fount of these "electric charges." Physicists were used to call 'negative' the electron, and when the 'positive' counterpart was discovered, it was called positron.

When atoms suffer disruptions, as in fusion and fission, the liberated positrons and electrons collide, leading to mutual 'anihilation,' by which electricity is transformed into a related energy (photonic energy [pE]) known as electromagnetic radiation. Positrons outside the nucleons are unstable, easily decaying into their component subparticles. They play no role in the phenomena of static and flowing electric energy.
Static electricity resides in the outermost electrons of atoms; dynamic, flowing electric energy, moves along electrons, which serve as conducting medium. The electrons themselves move slowly compared to the energy itself, which 'jumps' from electron to very nearby electron; otherwise, flow ceases.

While "jumping" for a few nanometers, electricity may be imagined as being in a 'special state,' which may be analogized with the brief existence of atoms when dissociated from their paired molecule. Ligtning "travels" long distances by means of these "minijumps," moving crookedly through charged thunderclouds and heat-ionized or dissociated air gases, among them oxygen, which will immediately form ozone. These clouds, made of water condensed at low temperatures, are charged by the friction caused by wind. Very rarely, lightning may emerge from charged "clouds" composed of fast-traveling dust and small sand particles, or from particulate volcanic matter erupted at high speed.
Similarly, dangerous sparks may jump from grains in silos, from accumulations of flour, and from large metal objects. It is possible that the sudden death of biblical Aharon's two sons when approaching together the altar was caused by a spark from the large metal objects nearby. Friction of different sources might cause the various electrostatic phenomena.

Electric energy is "loose," presumably gingerly touching the surface of the outermost atomic electrons, doing no work until it can flow, pushing then electrons and jumping, yet its true grist is revealed when being forced to overcome an obstacle, by truly doing work, at which time electricity effects a novel manifestation of energy, such as thermal (which is microkinetic), or as macrokinetic as in a motor.

Electricity has no sign: it is just "electric energy." What we call "negative" is the direction from which it flows along the continuum of molecules composing objects, and "positive" the direction in which it flows. This situation is easily understood when electrons are free to move, as happens in metals. Another --confusing-- name for positive is "hole," which is an appropriate image for the site where something is going to "fall" into. Actually, this moniker is applied to the place abandoned by an electron, as happens in artifacts called semiconductors. In such a situation, electrons coming from the applied wire-conducted electricity are not limited to do work: they become a source of "cheap" electrons which the semiconductor utilizes for its functions in "semiconductor electronics."
The electron-lacking 'holes' in the semiconductor behave as if they were positive, i.e., as places toward which incoming charged electrons move, and when they so do, the electric energy they carry is transformed in the encounter into "excitons," which become nonelectron-dependent "electrophotonic energy" of electromagnetic radiations (photons).