L6. Resonant LC Circuit with a Light Bulb

LC & RLC CIRCUITS - Resonance

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A series circuit consisting of a large solenoid, a variable capacitor, and a 200W lignt bulb is connected through a knife switch to 120 VDC. The inductance of the solenoid can be varied from about .1 H to 1 H by inserting an iron core, and the capacitance can also be changed from 1 µF to 15 µF. If the switch is thrown and the iron core slowly inserted in the solenoid, the cirucit will resonate at some point and the bulb will light up. This process is repeated for different values of the capacitor.

for additional notes see this [PDF]