MIT Physics Demo -- Resonant RLC Circuit

A variable capacitor (C), large inductor or solenoid (L), and 200W light bulb (R) are connected in series to 120 VAC. The inductance of the inductor can be varied by inserting an iron core, and the capacitance can be varied by a row of switches. By varying the inductance and capacitance, we can achieve the resonance of the circuit, where maximum current flows through the resistor (light bulb).
See the original post on MIT TechTV - http://techtv.mit.edu/videos/771

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• electrical
• electric
• light
• bulb
• circuit
• rlc
• resistance

[H0z3rz]

anyone else get a boner watching this?

[Phuckinator]

My girlfriend lights up like that too, as I slide my salami in and out she resonates when I hit that sweet spot...

[Kricardose]

I am very happy to see the vidoe The inductance of the inductor can be varied by inserting an iron core, and the capacitance can be varied by a row of switches. By varying the inductance and capacitance after you give this

[bebeheuy]

I Love The Video It Can Increase My Knowledge The inductance of the inductor can be varied by inserting an iron core, and the capacitance can be varied by a row of switches. By varying the inductance and capacitance, we can achieve the resonance of the circuit, where maximum current

[Mjhond]

Steady I Really Like This Video large inductor or solenoid (L), and 200W light bulb (R) are connected in series to 120 VAC

[YouBustedMyNut]

how the fuck did i even get here..

[78johnnybravo78]

Puh-leece, Power source not shown.

[kdkinen]

@Phuckinator

omg funny!

[BAMFWrangler]

at least wear rubber gloves lol

[LokiClock]

So the resonant frequency is being changed so that an existing oscillation's frequency is at the peak. What's the existing oscillation coming from?

[LokiClock]

@ManganistanDraselny From the description, pulling the core in and out varies the inductance. I'm assuming it goes down when the core is pulled out. When he flips the switches, he gives it more or less capacitance. For each capacitance, there's a peak in the inductance which will get the most light out of the bulb, so he tunes the inductance to hit that peak. The charge is oscillating, & the peak is a frequency. See Wikipedia's Harmonic oscillator#Equivalent systems for the spring analogy.

[ManganistanDraselny]

I don't understand so much what is doing in this video but is awesome :D