Frequency Response of an LCR Circuit

The Demonstration shows the variation of current with frequency in a circuit with a resistor, capacitor, and inductor in series. The current amplitude is proportional to:

,

where is the resistance, ω is the frequency, is the capacitance, and is the inductance.

Snapshot 1: The variation of current with frequency for the lowest value of resistance. The current amplitude is large and the resonance curve is sharp.

Snapshot 2: The variation of current with frequency for different values of resistance. The current amplitude peaks are large for smaller values of resistance and smaller for higher values of resistance. Higher values of resistance show broader resonance curves.

Snapshot 3: The current amplitude peaks shift with change of either the capacitance or inductance values.