Could someone help me out by explaining what is meant by resonant frequency and Q factor?? My teacher said that the resonant frequency is when the inductive resistance and capacitance resistance is equal to zero?? The Q factor is what?? the strength of resonant frequency?? thx for the assistance if u could help explain more. thx

Question

anonymous · Answer

The Q factor is a measure of how cleanly the system resonates - think of it as the quality of the resonance. On a graph of amplitude (y axis) and frequency (x axis), a system with a high Q factor (or quality) will have a very narrow peak at its resonant frequency.

anonymous · Answer

q factor is maximum peak of resonate phase..i know this theory and have answer about yr all questions but i learned this all in other languages so some difficulty. bt i will reply soon..its my favourite..

anonymous · Answer

The graph attached shows the amplitude of oscillation against frequency for two imaginary systems. The resonant frequency is the frequency at the centre of the peak (0 on the horizontal axis in both cases). The amplitude for both systems is the same.

The blue system has a wider peak - it will resonate over a wider range of frequencies. This makes it easier to oscillate, but means that it would not make a good filter - a number of frequencies can pass through it. It would be a low Quality filter, so has a low Q value.

The purple system has a much narrower peak. This would make this system harder to oscillate as you need to be closer to the resonant frequency. This makes it a better Quality filter, so it has a higher Q value.

In short - the resonant frequency is the frequency at the centre of the peak and the Q factor is proportional to 1/width
Hope that

anonymous · Answer

lets say u have a swing in ur backyard...and u give it a push...ull see its starts going back and forth (with a frequency...lets call it f0)..after a while it stops (because of friction).
Now, if u want to make it swing continuously u have to push it from time to time. If u push it at regular intervals, with the same frequency f0, u make it resonate (that is the swing will move faster and higher). Q is lower if the friction is bigger, meaning it takes more force to make it resonate