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Ohm: Refers to the unit of resistance in which a current of 1 ampere flows through it when a potential difference of 1 volt maintains between its two ends. 1ohm = 1 volt / 1 ampere

One axis tracking: Refers to the photovoltaic system in which the panels move about the centre axis, with a freedom of movement of 1 degree.

Open-circuit voltage / VOC: Refers to the highest voltage achieved across a solar module or cell under sunlight, when there is no current passing through it.