5J10.20 - Back EMF in an Inductor
Demonstrate back emf in an electromagnet.
There is an incandescent lamp/socket connected directly across the leads of the large inductor. The lamp burns with a red glow while the inductor is running, but when the power is turned off, there is a bright flash because of the increased emf due to the self-inductance of the inductor. Note that if you use this experiment with a meter, the current rise of the resistor vs. the inductor/lamp assembly is still very different however because of the added resistance in parallel to the inductor the current rise on that side is faster than the inductor without the lamp in the circuit.