Electrical Engineering ⇒ Topic : Q-Factor of Series Resonant Circuit
Q-Factor of Series Resonant Circuit
At series resonance, the voltage across L or C (the two drops being equal and opposite) builds up to a value many times greater than the applied voltage V (= *IrR).
The ratio VL / V or VC / V at resonance is a measure of the quality of a series resonant circuit.
This is called the Q-factor (Q stands for quality) of the circuit. It is also known as the voltage magnification factor.
Since the coil resistance is often the only resistance in a series resonant circuit, the Q is sometimes refered to as the Q-factor of the coil. Therefore, we use the expression XL / R for Q in series resonant circuit.
The Q-factor of a series resonant circuit can also be expressed in terms of L and C.
The series resonant circuit is also called an acceptor circuit because such a circuit accepts currents at one particular frequency (i.e., fr) but virtually rejects currents of other frequencies. Such circuits are used in radio and television receivers
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