
Power quality determines the fitness of electrical power to consumer devices. Synchronization of the voltage frequency and phase allows electrical systems to function in their intended manner without significant loss of performance or life. The term is used to describe electric power that drives an electrical load and the load`s ability to functi....
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http://en.wikipedia.org/wiki/Power_quality

Power quality refers to how well electricity interacts with electrical equipment. When electricity is handled by an electrical component efficiently and without damage to the component, the power quality is high. Electrical equipment with low power quality either suffers from frequent malfunctions or becomes damaged by the electrical power during u...
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http://www.used-line.com/glossaries/glossary.cfm?g_id=7
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