Wednesday, June 29, 2011

Lecture 24 of MIT Freshman EM

I'm back to studying for the Physics quals at New Mexico State. Today I reviewed lecture 24 of the Freshman EM class there. You can watch it below. Timestamps and additional notes follow.

At the end of the video, there's a very cool explanation and demonstration of a Ruhmkorff, (shown at left). It works in a similar manner to a car's induction coil and can make sparks in air between terminals separated by 10 cm. To read more about it, check out the Wikipedia article on indicution coils.

Timestamps and notes
RC circuit charging over time

7:00 derivation of differential equation for RC circuit.

8:34 Solution

21:48 Transformers
33:00 Cool transformer demo
39:00 Induction heater demo with a nail
43:00 car transformer
49:00 Rumkorf spark generator

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