Phase of a wave is the angular displacement of a sinusoid from a reference point or time. Phase in the context of alternating current can be considered as corresponding to the angular position of the armature in the AC generator. Armature is the part which generates an electric current when it rotates in a magnetic field. Armature is made of a coil of wire wound around an iron core. Instead of the armature rotating, magnetic field can be made to rotate by rotating the permanent magnet which produces the magnetic field. The term phase is also used to denote the live wire in home electrical wiring.
