Wafer — A thin sheet of semiconductor (photovoltaic material) made by cutting it from a single crystal or ingot.
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).
Waveform — The shape of the phase power at a certain frequency and amplitude.
Wet Shelf Life — The period of time that a charged battery, when filled with electrolyte, can remain unused
before dropping below a specified level of performance.
Window — A wide band gap material chosen for its transparency to light. Generally used as the top layer of a
photovoltaic device, the window allows almost all of the light to reach the semiconductor layers beneath.
Wire Types — See Article 300 of National Electric Code for more information.
Work Function — The energy difference between the Fermi level and vacuum zero. The minimum amount of
energy it takes to remove an electron from a substance into the vacuum.
Z
Zenith Angle — the angle between the direction of interest (of the sun, for example) and the zenith (directly
overhead).
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).
Waveform — The shape of the phase power at a certain frequency and amplitude.
Wet Shelf Life — The period of time that a charged battery, when filled with electrolyte, can remain unused
before dropping below a specified level of performance.
Window — A wide band gap material chosen for its transparency to light. Generally used as the top layer of a
photovoltaic device, the window allows almost all of the light to reach the semiconductor layers beneath.
Wire Types — See Article 300 of National Electric Code for more information.
Work Function — The energy difference between the Fermi level and vacuum zero. The minimum amount of
energy it takes to remove an electron from a substance into the vacuum.
Z
Zenith Angle — the angle between the direction of interest (of the sun, for example) and the zenith (directly
overhead).
GLOSSARY OF TERMS
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