Alternating current: electricity is delivered to business premises in the form of a current that follows a sinusoidal waveform that alternates from a positive to a negative value about 50 times a second.



Direct current is a unidirectional flow of electricity and is commonly associated with batteries as well as photovoltaic panels. DC is often thought to be a greater threat to life than AC because of be way that it causes the muscles in the body to react.


Abbreviated in this document to PV panels, these devices use light, normally from the sun, to produce DC electric current which may be converted to AC current for use locally or for feeding into the public supply grid.

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