(26) Experiment V -Resonance in an LRC circuit: Can the voltage across the induc
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Question
(26) Experiment V -Resonance in an LRC circuit: Can the voltage across the inductor in a series LRC circuit be larger than the voltage across the voltage source? Briefly explain.
(27) Experiment V -Resonance in an LRC circuit: A series LRC circuit is driven at a frequency which is much less than the resonant frequency with a sine wave voltage source V0sin(t). What is the approximate voltage across the capacitor? Briefly explain.
(28) Experiment V -Resonance in an LRC circuit: A series LRC circuit is driven at resonance with a sine wave voltage source. What is the sum of the voltages across the inductor and the capacitor in an ideal circuit? Briefly explain.
(29) Experiment V -Resonance in an LRC circuit: Explain the difference between impedance and resistance.
Explanation / Answer
26) Yes, the voltage across the inductor in a series LRC circuit can be larger than the voltage across the voltage source . This phenomenon is called voltage magnification. And it is equal to the Q factor of the circuit.
27) approximate voltage across the capacitor = (Vosinwt/sqrt(R2 + Xc2)) * Xc
where, Xc = 1/wC
28) sum of the voltages across the inductor and the capacitor in an ideal circuit = 0
when a series RLC circuit is driven at its resonant frequency, the inductive reactance and capacitive reactance cancel and the current is limited only by the series resistance.
29) DC circuit will not exhibit any form of Reactance, therefore opposition to current flow will always be measured in Resistance. Reactance exists in two forms, Capacitive & Inductive. Impedance can therefore be thought of as the opposition of electrical current flow in a AC circuit.
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