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Wafer
A thin sheet of semiconductor material made by mechanically sawing it from a single-crystal or multi-crystal ingot or casting.

Watt (W)
The unit of electric power, or amount of work (J), done in a unit of time. One ampere of current flowing at a potential of one volt produces one watt of power.

Watt-hour (Wh)
See 'Kilowatt-hour.

Watt-hour (Wh)
A quantity of energy. One watt-hour of electricity is consumed when one watt of power is used for one hour.