1. Complex impedance
The function of a dielectric is to store and isolate "two electricities"
. As this function is never perfect, the dielectric is generally represented by a complex impedance
. This representation makes it possible to account for the phase shift of the voltage with respect to the current noted φ and its complement δ to arrive at the phase shift of a perfect dielectric: π/2 = δ-φ (figure
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Complex impedance
Measurement techniques
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