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 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 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!

MIT Department of Physics Technical Services Group

MIT Department of Physics Technical Services Group

Category: Science | Updated over 1 year ago

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


Viewed
49448 times

More from MIT Department of Physics Technical Services Group

Field of a Sphere and an Infinite Plane

Field of a Sphere and an Infinite P...

Added over 3 years ago | 00:02:23 | 7718 views

Monkey and a Gun

Monkey and a Gun

Added over 6 years ago | 00:01:16 | 60009 views

Gyroscopes Made Easy

Gyroscopes Made Easy

Added almost 3 years ago | 00:29:09 | 5376 views

Rubber and Glass Rods with Tinsel and Balloon

Rubber and Glass Rods with Tinsel a...

Added 6 years ago | 00:02:02 | 38607 views

MIT Physics Demo -- Conductivity of Ionized Water

MIT Physics Demo -- Conductivity of...

Added over 6 years ago | 00:00:53 | 46511 views

Bell Labs Wave Machine: Standing Waves

Bell Labs Wave Machine: Standing Waves

Added almost 4 years ago | 00:01:16 | 15262 views