1. AC (alternating current) generally refers to alternating current.
Alternating current refers to a current whose direction changes periodically with time. The average current in a cycle is zero. Unlike direct current, which changes direction over time, direct current does not change periodically.
2. Accepted
Accepted, referred to as AC, means that the test sample has been passed (the answer is correct). It is usually displayed in the informatics competition online evaluation system (Online Judge) and is information. One of the terms commonly used in academic competitions.
History of the Development of AC (Alternating Current)
When electromagnetic induction was discovered, the method of generating alternating current became known. Early generators were invented by British Michael Faraday and Frenchman Hippolyte Pixii.
In 1882, British electrician James Gordon built a large two-phase alternator. Lord Kelvin and Sebastian Ziani de Ferranti develop early alternating current generators with frequencies between 100 Hz and 300 Hz.
In 1891, Nikola Tesla patented a high-frequency alternator (15000Hz).
After 1891, polyphase alternators were used to supply current. The alternating current frequency of subsequent alternators was usually designed between 16 Hz and 100 Hz, and was used with arc lamps, incandescent lamps or electric motors. .
According to the law of electromagnetic induction, when the magnetic field around a conductor changes, an induced current is generated in the conductor. Typically, the rotating magnet is called the rotor, and the fixed group of conductors in a coil wound around an iron core, called the stator, produces an electric current when it crosses a magnetic field. The basic machine that generates alternating current is called an alternator.
Reference for the above content: Baidu Encyclopedia-AC; Baidu Encyclopedia-AC