AC current, said to be invented and developed by Nikola Tesla but that is not likely the case.
Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, fans and electric lamps into a wall socket. A common source of DC power is a battery cell in a flashlight. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.
The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa. In certain applications, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information such as sound (audio) or images (video) sometimes carried by modulation of an AC carrier signal. These currents typically alternate at higher frequencies than those used in power transmission. Alternating Current
13.06 - Triple Currents of Electricity
15.10 - Dissociating Water with Alternating Current - Puharich
16.25 - Magnetic Attraction caused by Dominant Current of Electrical Stream
16.29 - Triple Currents of Electricity
Figure 7B.19 - Magnetic Lines of Force developed from Induction of Current Flow