A PV array that follows the path of the sun. This can mean one-axis, east to west daily tracking, or two-axis tracking where the array follows the sun in azimuth and elevation.
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Vertical Multijunction (VMJ) Cell
A compound cell made of different semiconductor materials in layers, one above the other. Sunlight entering the top passes through successive cell barriers, each of which converts a separate portion of the spectrum into electricity, thus achieving greater total conversion efficiency of the incident light. Also called a multiple junction cell.
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Volt (V)
A unit of electrical force equal to that amount of electromotive force that will cause a steady current of one ampere to flow through a resistance of one ohm.
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Voltage
The amount of electromotive force, measured in volts, that exists between two points.
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Wafer
A thin sheet of semiconductor material made by mechanically sawing it from a single-crystal or multicrystal ingot or casting.
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Watt
The rate of energy transfer equivalent to one ampere under an electrical pressure of one volt. One watt equals 1/746 horsepower, or one joule per second. It is the product of voltage and current (amperage).
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Watt hour (Wh)
A unit of energy equal to one watt of power connected for one hour.
