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In electrical engineering, ground or earth may refer to reference ground – a reference point in an electrical circuit from which voltages are measured, earth ground – an electrically neutral node that has a lot of available charges, or common ground – a common return path for electric current. Ground current or earth current is the current that flows through a reference ground, earth ground, or common ground. To ground or to earth an object is to electrically connect the object to a reference ground, earth ground, or common ground. Electrical circuits may be grounded for several reasons.
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