Thanassis G. Giokas
Knowing not how to listen, they do not (know) how to speak.
HERACLITUS
Ελληνικά English

ELECTRONIC COMPONENTS AND MATERIALS TEXTBOOK

CHAPTER 4 - COILS

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EQUIVALENT CIRCUIT OF COIL AND ITS ATTRIBUTES
a) In high frequencies, a coil can have the equivalent of Figure below, contrary to the low frequencies where it can be regarded as L and R in sequence, with Z=R, XL≈0 and XC≈∞.
So, in high frequencies we have:
and its resonance frequency:
but because R«jωL, then:

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