An electrical generation apparatus comprising a magnetic mass 18 magnetically attracted to a guide member 14 such that the mass is moveable, in use, along a path defined by the shape of the outer periphery of the guide member, the mass being moveable past a coil 20, and at least one repulsion magnet 16a, 16b, of the same polarity as the mass and positioned to repel the mass such that the mass undertakes a pendulum-like reciprocating motion, repeatedly passing the coil. Two repulsion magnets may be provided, wherein the presence of the repulsion magnets results in the application of non-linear forces on the mass, in use. The mass may be of circular shape and its movement relative to the guide member is a rolling movement. The mass may be guided for movement between a pair of coils. The guide member may comprise a permanent magnet. The guide member may have an outer periphery of circular shape, that is smoothly curved so that the path along which the mass is guided is of smoothly curved form.
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