INDUCTANCE

5J20.20 LAMP IN PARALLEL WITH INDUCTOR
5J20.21 LAMP IN SERIES WITH INDUCTOR



5J20.20 Lamp in Parallel with Inductor

Hook light bulb(12v or120v) in a parallel with a large electromagnet and battery. Open switch to discharge coil through bulb to produce bright flash. 12v bulb will glow before switch opened. 120v bulb will not glow before switch opened.

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Setup Requirements: Assembled as needed. Ask at least 24 hr ahead of time.

 

Equations: V = Ldi/dt

 

Safety Issues: Heavy magnet. Large current when open switch (sparks).



5J20.21 Lamps in series with inductor

Hook light bulb(12v) in a series with a large electromagnet and battery. There will be a small but noticable delay after closing switch before bulb glows at full brightness.

 !5j20_21.jpg

Setup Requirements: Assembled as needed. Ask at least 24 hr ahead of time.

 

Equations: V=Ldi/dt

 

Safety Issues: Heavy Magnet