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 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".
In electric power transmission and distribution, volt-ampere reactive (var) is a unit by which reactive power is expressed in an AC electric power system.
 Reactive power exists in an AC circuit when the current and voltage are not in phase.
 The correct symbol is var and not Var, VAr, or VAR, but all three terms are widely used, and VAR is widely used throughout the power industry infrastructure.
 The term "var" was proposed by the Romanian electrical engineer Constantin Budeanu and introduced in 1930 by the IEC in Stockholm, which has adopted it as the unit for reactive power.
The War of Currents (sometimes called War of the Currents or Battle of Currents) was a format war involving the introduction of competing electric power transmission systems in the late 1880s and early 1890s.
 It included commercial competition, a debate over electrical safety, and a media/propaganda campaign that grew out of it, with the main players being the direct current (DC) based Edison Electric Light Company and the alternating current (AC) based Westinghouse Electric Company.
 It took place during the introduction and rapid expansion of the alternating current standard (already in use and advocated by several US and European companies) and its eventual adoption over the direct current distribution system.
 Three aspects have been conflated into the "war": open competition involving large electric companies and their developing systems, a general fear in the public's mind of death by accidental electrocution from high voltage AC leading to a debate over its safety and regulation, and the debate and behind-the-scene maneuvers associated with the introduction of the electric chair.
Three-phase electric power is a common method of alternating current electric power generation, transmission, and distribution.
 It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power.
 It is also used to power large motors and other heavy loads.
The electric power industry is the generation, transmission, distribution and sale of electric power to the general public.
 The electrical industry started with introduction of electric lighting in 1882.
 Throughout the 1880s and 1890s, growing economic and safety concerns lead to the regulation of the industry.
 Once an expensive novelty limited to the most densely populated areas, reliable and economical electric power has become a requirement for normal operation of all elements of developed economies.
In electrical engineering, power engineering and the electric power industry, power conversion is converting electric energy from one form to another such as converting between AC and DC; or just changing the voltage or frequency; or some combination of these.
 A power converter is an electrical or electro-mechanical device for converting electrical energy.
 This could be as simple as a transformer to change the voltage of AC power, but also includes far more complex systems.
 The term can also refer to a class of electrical machinery that is used to convert one frequency of alternating current into another frequency.
Steinmetz College Prep (also known as Steinmetz High School or Steinmetz Academic Centre) is a public 4–year high school located in Montclare, in the Belmont Cragin community area on the Northwest Side of Chicago, Illinois.
 Steinmetz is a part of the Chicago Public Schools district.
 The school is named for the German-American mathematician and electrical engineer Charles Proteus Steinmetz.
 The school opened in 1919.
 Steinmetz is an International Baccalaureate (IB) Programme school.
 The school has an active Junior Reserve Officers' Training Corps (JROTC).
In electrical engineering, single-phase electric power is the distribution of alternating current electric power using a system in which all the voltages of the supply vary in unison.
 Single-phase distribution is used when loads are mostly lighting and heating, with few large electric motors.
 A single-phase supply connected to an alternating current electric motor does not produce a revolving magnetic field; single-phase motors need additional circuits for starting, and such motors are uncommon above 10 kW in rating.
In the electric power industry, a Transmission Service Request is an application requesting a transmission-owning utility to allocate physical capacity in the form of Transmission Service Rights (TSRs) for the transmission of electric power.
 Every TSR includes at least three components: 1) a Point of Delivery (POD), where the power is injected into the utility's transmission network; 2) a Point of Receipt (POR), where the power is withdrawn from the utility's transmission network; 3) the amount of power, or capacity, in megawatts to be reserved.
 In order to receive TSR, a Transmission Customer (TC) must complete a transmission service request and go through a system impact study to determine if the existing transmission facilities can reliably accommodate the physical transfer of the electric power.
 If the capacity is not available, the transmission customer may decide to pay to upgrade the transmission network.
Charles Proteus Steinmetz (April 9, 1865 – October 26, 1923; birth-name: Karl August Rudolph Steinmetz) was a German-born American mathematician and electrical engineer and professor at Union College.
 He fostered the development of alternating current that made possible the expansion of the electric power industry in the United States, formulating mathematical theories for engineers.
 He made ground-breaking discoveries in the understanding of hysteresis that enabled engineers to design better electromagnetic apparatus equipment including especially electric motors for use in industry.

Question: What type of school was named after a professor that fostered the development of alternating current that made possible the expansion of the electric power industry in the US? 
Answer: public 4–year high school