Concentric objects share the same center or origin. Circles, disks, and spheres may be concentric; such concentric objects need not have the same radius. As used in philosophy, object is a thing, an entity, or a being. ... Center (American English), Centre (Commonwealth English), has a number of meanings. ... The origin of something (from the Latin origo, beginning) is where it came from, in the sense of a physical location or a metaphysical source. ... In Euclidean geometry, a circle is the set of all points in a plane at a fixed distance, called the radius, from a fixed point, called the centre. ... A synonym for ball (in geometry or topology, and in any dimension) is disk (or disc Geometry In metric geometry, a ball is a set containing all points within a specified distance of a given point. ... A sphere is, roughly speaking, a ball-shaped object. ... In classical geometry, a radius of a circle or sphere is any line segment with one endpoint on the circle (i. ...

Concentric cable is a cable type used in TN-C-S earthing systems where the combined neutral and earth core completely surrounds the live core(s). This minimises the risk of completely cutting through the combined neutral and earth without first completely cutting through the live cores. A cable is two or more wires bound together which may be bare or covered or insulated. ... A TN-C-S earthing system is one where where earth and neutral are combined in the supply wiring but are separate in the installation. ... For uses of the term ground or earth in electricity but outside of mains wiring please see Ground (electricity) Ground or earth in a mains (AC power) electrical wiring system is a core that exists primarily to help protect against faults. ...

See also: eccentric In popular usage, eccentricity refers to unusual or odd behavior on the part of a person, as opposed to being normal. ...

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