Dec 16, 2011 #1 B baby_1 Advanced Member level 1 Joined Dec 3, 2010 Messages 415 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,298 Activity points 4,277 Hello according a text quality factor is the ratio of energy stored to energy lost in a component. but in rlc or lc and rl the Q=wL/R (w=omega) why we didn't use the capacitor reactance instead of reactance of Self?
Hello according a text quality factor is the ratio of energy stored to energy lost in a component. but in rlc or lc and rl the Q=wL/R (w=omega) why we didn't use the capacitor reactance instead of reactance of Self?
Dec 16, 2011 #2 B BradtheRad Super Moderator Staff member Joined Apr 1, 2011 Messages 15,187 Helped 2,900 Reputation 5,812 Reaction score 2,982 Trophy points 1,393 Location Minneapolis, Minnesota, USA Activity points 113,782 The resistance comes from the coil. And the greater the resistance in the loop, the greater the damping effect, and the lower the quality factor. Since the capacitor is omitted in the equation, then it must be because it is regarded as having a pure action.
The resistance comes from the coil. And the greater the resistance in the loop, the greater the damping effect, and the lower the quality factor. Since the capacitor is omitted in the equation, then it must be because it is regarded as having a pure action.
Dec 18, 2011 #3 R RCinFLA Advanced Member level 2 Joined Aug 31, 2010 Messages 605 Helped 187 Reputation 378 Reaction score 190 Trophy points 1,323 Activity points 5,795 Most of the time capacitors are much higher Q then a coil in a resonate tank but not really relevant. Use X_inductor or X_cap as they are same at resonance. Q is also equal to F_resonance / BW3db. (for a single LC tank) Last edited: Dec 18, 2011
Most of the time capacitors are much higher Q then a coil in a resonate tank but not really relevant. Use X_inductor or X_cap as they are same at resonance. Q is also equal to F_resonance / BW3db. (for a single LC tank)
Dec 18, 2011 #4 Z zorro Advanced Member level 4 Joined Sep 6, 2001 Messages 1,130 Helped 357 Reputation 712 Reaction score 298 Trophy points 1,363 Location Argentina Activity points 8,913 Distinguish the different cases: RLC, RL or RC circuit. For a resonant (RLC) circuit: Q = 2*pi*(max energy stored in L or C)/(energy dissipated in 1 cycle). At resonance, the reactance of the inductor and that of the capacitor have the same value: w0L=1/(w0c) The formula Q=w0L/R=1/(w0CR) hold for a series RLC circuit. For a parallel circuit: Q=R/(w0L)=w0CR. Regards Z
Distinguish the different cases: RLC, RL or RC circuit. For a resonant (RLC) circuit: Q = 2*pi*(max energy stored in L or C)/(energy dissipated in 1 cycle). At resonance, the reactance of the inductor and that of the capacitor have the same value: w0L=1/(w0c) The formula Q=w0L/R=1/(w0CR) hold for a series RLC circuit. For a parallel circuit: Q=R/(w0L)=w0CR. Regards Z