The Q or quality factor is used with many RF tuned circuits or elements to indicate their performance in an oscillator or other form of resonant circuit. Simple formulas relate the losses and bandwidth to the Q. The quality factor relates the maximum or peak energy stored in the circuit (the reactance) to the energy dissipated (the resistance) during each cycle of oscillation meaning that it is a ratio of resonant frequency to bandwidth and the higher the circuit Q, the smaller the bandwidth, Q = ƒr /BW. into above Eq. When resonance occurs in a parallel RLC circuit, a local current circulates between the inductor and the capacitor. Generally speaking, for an underdamped RLC system, the quality factor (Q) provides a comparison of the resonant frequency (w0) and the rate of decay or damping factor of the oscillating states (a). Table 3: Comparison table Make a comparison table for the estimated values of bandwidth and quality factor for different resistors. The frequency response of the circuits current magnitude above, relates to the “sharpness” of the resonance in a series resonance circuit. Electrical resonance is said to take place in a series LCR circuit when the circuit allows maximum current for a given frequency of the source of alternating supply for which capacitive reactance becomes equal to the inductive reactance. Resonance. 0 μ F and inductance L = 5. A series resonant LCR circuit has a quality factor (Q-factor) 0.4. The LCR Parallel Resonant Circuit. 3. An LCR circuit, also known as a resonant circuit, tuned circuit, or an RLC circuit, is an electrical circuit consisting of an inductor (L), capacitor (C) and resistor (R) connected in series or parallel. Values for quality factor are often seen quoted and can be used in defining the performance of an inductor, a capacitor or tuned circuit. (1) and deduce the quality factor of the series resonant LCR circuit for different values of resistor. Parallel resonance, which is more common in electronic practice, requires a more careful definition. The LCR circuit analysis can be understood better in terms of phasors. It is approximately defined as the ratio of the initial energy stored in the resonator to the energy lost in one radian of the cycle of oscillation. A sinusoidal voltage of peak value 10 V is applied to a series LCR circuit in which resistance capacitance and inductance have value of 10ohm, 1µF and 1H respectively .find (i)the frequency which drives the circuit at resonance (ii)quality factor of the circuit. Compare them and draw conclusions. Electrical Resonance in Series LCR Circuit and Quality Factor Electrical Resonance in Series LCR Circuit. 0 V requires a power (p) = 0. If R = 2 kΩ, C= 0.1μF,then the value of inductance is asked Jan 20, 2019 in Physics by kajalk ( 77.6k points) Find the quality factor of a circuit with capacitance C = 2. Figure 2 Principle of induction heater and induction cooker. The bandwidth can be calculated as BW = f res /Q 4. In physics and engineering the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is. In introducing the LCR Series Circuit, one of the most useful combinations of "passive components" in electronics, Module 9 set the groundwork for Module 10. 0 m H if the maintenance of undamped oscillations in the circuit with the voltage amplitude across the capacitor being equal to V m = 1. Resonance in AC circuits implies a special frequency determined by the values of the resistance, capacitance, and inductance.For series resonance the condition of resonance is straightforward and it is characterized by minimum impedance and zero phase. The sharpness of the peak is measured quantitatively and is called the Quality factor, Q of the circuit. If the LCR series circuit is just one of the most useful circuits, here is the other one, the LCR Parallel Resonant Circuit! 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