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Definition: The ratio of the power loss in a dielectric material to the total power transmitted through the dielectric, the imperfection of the dielectric. Equal to the tangent of the loss angle (dimensionless):

where

f = frequency of applied voltage in cps
Cp = equivalent parallel capacity
Rp = equivalent parallel resistance
δ = loss angle

Most plastics have a low dissipation factor, a desirable property because it minimizes the waste of electrical energy as heat.
Definition Copyright ©1989 CRC Press LLC. All rights reserved.

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