In Physics, Electric current is defined as the movement of electric charge carriers, such as subatomic charged particles, ions or holes. An electric current in a wire is described as the measure of the quantity of charge passing any point of the wire per unit of time. An electric current is most always accompanied by a magnetic field and hence the entire fore is known as electromagnetic force. The SI unit of electric current is ampere and the device used to measure the electric current is called an ammeter. Naturally observable examples of electric current include lightning, static electric discharge and solar winds. Superconductivity is another phenomenon where certain materials when cooled below a characteristic critical temperature attain zero electrical resistance.
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