hi all,
another confusing one
A coil of inductance 120mH & resistance 150 ohms is connected in parallel with a variable cap across a 20 V, 4Khz supply. determine for the condition when the supply current is a minimum:
(a) the capacitance of the capacitor
(b) the dynamic resistance
(c) the supply current
(d) the Q-factor
(e) the bandwidth
(f) the upper and lower -3dB frequencies
(g) the value of the circuit impendance at the -3dB frequency
I can do all except (d)
My text book says in parallel Q=R/X but govener says its wrong
he says its Q=WrL/R but my text book says thts for series.... is it something to do with the dynamic impedance??
any help would be good!!
another confusing one
A coil of inductance 120mH & resistance 150 ohms is connected in parallel with a variable cap across a 20 V, 4Khz supply. determine for the condition when the supply current is a minimum:
(a) the capacitance of the capacitor
(b) the dynamic resistance
(c) the supply current
(d) the Q-factor
(e) the bandwidth
(f) the upper and lower -3dB frequencies
(g) the value of the circuit impendance at the -3dB frequency
I can do all except (d)
My text book says in parallel Q=R/X but govener says its wrong
he says its Q=WrL/R but my text book says thts for series.... is it something to do with the dynamic impedance??
any help would be good!!