Back EMF

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Description:

A current is run through a coil, which in turn is hooked up to an oscilloscope. A 330 ohm resistor is placed between the positive and negative terminals of the coil. With the oscilloscope in storage mode, a sharp negative peak can be seen to coincide with a spark when one of the banana plugs is pulled from the transformer.

Location:

• Coil from transformer: Shelf J-3
• 6/12 Volt Power Supply: Shelf K-3
• Oscilloscope: Black Cabinet