Lighting Research Center Lighting Research Center
Connecticut Energy Efficiency Fund
Natural Resources Canada
Power Quality
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Title:  Power Quality
Date:  1995
Author(s):  Robert Wolsey
Number of Pages:  8
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Power Quality helps readers better understand power quality so that they can more confidently select energy-efficient lighting products. Concerns about the effects of lighting products on power distribution systems have focused attention on power quality. Poor power quality can waste energy and the capacity of an electrical system. It can harm both the electrical distribution system and devices operating on the system. For an electrical distribution system, power quality is the extent to which line voltage is a sine wave of constant amplitude. For a specific electric device, power quality describes the extent to which the device both distorts the voltage waveform and changes the phase relationship between voltage and current. A device with ideal power quality characteristics neither distorts the supply voltage nor affects the voltage-current phase relationship.


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