Massachusetts Institute of Technology
Sign in Create Account

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).

Read more about RLC circuits here.

Comments (2)

For all but the final capacitance value, the ‘tuning’ effect (whilst moving the core back and forth) cannot be seen. At the resonant position of the core the operator’s hand is out of view.

Posted over 6 years by Anonymous

Have you heard of making capacitors from tinfoil and party cups, 1 wrap tinfoil around bottom of cup and attach left hand lead, 2 Add a cup to bottom of other cup ontop of tinfoil, and attach right hand lead, 3 Repeat and Repeat 4 Fill with mineral oil and cap the top. 5 attach Right Hand Leads together (every other cup got one) With a piece of metal tape. 6 Repeat step5 with Left Hand Leads. 7 apply voltage and watch it work.

Posted over 6 years by Anonymous

You need to log in, in order to post comments. If you don’t have an account yet, sign up now!

Created
April 22, 2008 14:38
Category
Tags
License
Creative Commons Attribution-NonCommercial (What is this?)
Additional Files


Viewed
50922 times

More from MIT Department of Physics Technical Services Group

Hero's Engine

Hero's Engine

Added over 4 years ago | 00:01:38 | 22112 views

Fluorescent and Neon Tubes in an Electric Field

Fluorescent and Neon Tubes in an El...

Added over 5 years ago | 00:02:02 | 35545 views

Speed of a Bullet

Speed of a Bullet

Added almost 7 years ago | 00:00:22 | 44986 views

Magnetizing and Demagnetizing an Iron Rod

Magnetizing and Demagnetizing an Ir...

Added almost 3 years ago | 00:01:37 | 4599 views

The Wimshurst Machine

The Wimshurst Machine

Added over 5 years ago | 00:02:33 | 42465 views

Center of Mass Trajectory

Center of Mass Trajectory

Added 6 years ago | 00:01:30 | 49938 views