Electronics > Beginners
Resonator Q factor and current
fonograph:
If I have resonator with Q factor 10 with peak at 10 Hz,if I supply that resonator with 1 volt 1 amp 10 Hz sinewave from signal source,how high would the current inside that resonator get? Would the current be 1 amp or 10 amps?
bson:
For a passive resonator, 1A.
Look up Kirchhoff's current law: what goes in must go out, and what goes out must come from somewhere. Hence if it sits in a circuit the current inside it can't exceed the current at its terminals.
For an active resonator you need to include the supply current(s).
rfeecs:
--- Quote from: bson on August 07, 2018, 11:34:20 pm ---For a passive resonator, 1A.
Look up Kirchhoff's current law: what goes in must go out, and what goes out must come from somewhere. Hence if it sits in a circuit the current inside it can't exceed the current at its terminals.
For an active resonator you need to include the supply current(s).
--- End quote ---
No, for a parallel LC for example, the current circulating around the loop between L and C would be about Q times the current from the signal source, or 10 amps.
rfeecs:
Here's an example:
fonograph:
bson says 1 amp,rfeeces 10 amps... so which one is true? I dont understand that circuit picture,but I think two of these probes say 10 while two say 1,so I guess thats proof that the circulating current inside resonator is the current of the signal source times the Q factor.
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