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It is related to damping in the circuit using a resistor.

Q is inversely proportional to the resistor(R).

So if the value of resistance is high, there is a greater damping and the value of Q will be low.

if resistance is low, there is small damping and Q will be high.

when Q is high(low damping) the graph of voltage across resistor against frequency will be sharp at resonance and the bandwidth will be small

when Q is low(high damping) thee graph will be less sharp as the bandwidth will be large.

Go do some research on the graphs and the formula of Q factor to understand it better.

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Transformer Z-ratio = (Zpri / Zsec) = (Vpri / Vsec)2 It could also be the damping factor DF = Zload / Zsource The damping factor DF is the load impedance Zload (input impedance) divided by the the source impedance Zsource (output impedance).

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