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Definitions (26)

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» HomeAbout MicroHydro.ieWhat is Hydroelectricity?ServicesCase StudiesContact Us You are here: Home -> What is Hydroelectricity? -> Glossary of Hydroelectric DefinitionsA A  Glossary of Hydroelectric Terms and Definitions
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alternating current


A continuous electric current that periodically reverses direction, usually sinusoidal.
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ampere


The ampere is a measure of the current, or the amount of electric charge passing a point per unit time.
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average annual energy production


The total energy generated annually by a power station, on average over a period of time of full operation or since the start of full operation, measured in kilowatt-hours (GWh).
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cavitation


Noise or vibration causing damage to the turbine blades as a results of bubbles that form in the water as it goes through the turbine which causes a loss in capacity, head loss, efficiency loss, and the cavity or bubble collapses when they pass into higher regions of pressure.
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current


The flow of electricity through a conductor, measured in Amperes.
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draught tube


A water conduit, which can be straight or curved depending upon the turbine installation, that maintains a column of water from the turbine outlet and the downstream water level.
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efficiency


A percentage obtained by dividing the actual power or energy by the theoretical power or energy. It represents how well the hydropower plant converts the energy of the water into electrical energy.
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head


Vertical change in elevation, expressed in meters, between the head water level and the tailwater level.
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green energy


Electricity generation considered to be less intrusive environmentally than traditional generation.
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