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Hard drive is a device that stores information in virtually all desktop and laptop computers. The drive includes one or more rigid magnetic disks that hold the data. These disks are called hard disks or platters. Many people use the term hard disk to refer to the entire hard drive. The platters are usually fixed inside the drive and cannot be removed. They are stacked on top of one another. Data are stored on each side of a platter's surface, on circular bands called tracks. A hard drive has… More »
Alternating current (AC) is electric current that regularly reverses its direction of flow. It is... More >>
Electric circuit is the path followed by an electric current. When current flows in a circuit,... More >>
Electric current is the movement or flow of electric charges. A charge can be either positive or... More >>
Electricity is a basic feature of the matter that makes up everything in the universe. When most... More >>
Electronics is a branch of physics and engineering that involves controlling the flow of electric... More >>
Superconductivity is the ability of some materials to conduct electric current without resistance... More >>
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