Memristor is a portmanteau of memory resistor, because it is a resistor that remembers its history. A memristor is a two-terminal device whose resistance depends on the magnitude and polarity of the voltage applied to it and the length of time that voltage has been applied. When you turn o the voltage, the memristor remembers its most recent resistance until the next time it is turned on. Memristor was envisioned in 1971 by Leon Ong Chua noticed there is a missing link in the pair wise mathematical equations that relate the four circuit quantities charge, current, voltage, and magnetic flux to one another.They can be related in six ways.
Two are connected through the basic physical laws of electricity and magnetism, and three are related by the known circuit elements: resistors connect voltage and current, inductors connect flux and current, and capacitors connect voltage and charge. But one equation is missing from this group: the relationship between charge moving through a circuit and the magnetic flux surrounded by that circuit. Memristor fills up this hole.
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