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5J10.20 - Back EMF in an Inductor

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​5J10.20 - Back EMF in an Inductor

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Title5J10.20 - Back EMF in an Inductor
Objective

Demonstrate back emf in an electromagnet.​

StatusAvailable
Assembly Instructions

Instructions
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. ​

Setup Time15
Operation Time2
Preview Time5
Operation Instructions
ExportableNo
Demo on DimeNo
PIRA 200Yes
Export Instructions (if different)
HazardsNone
Analysis/Information
Category5 Electricity and Magnetism
Subcategory5J - Inductance
Keywordsinduced emf, electromotive force, self inductance
Construction Information
 
Equipment TitleUse SHIFT+ENTER to open the menu (new window).
  
QuantityUse SHIFT+ENTER to open the menu (new window).
  
power supply - 20V, 40A, Tenma, with banana plug bank
1
inductor - 1500T #16wire 2.75H 8.2 Ohms
1
incandescent lamp - 2V, with Edison base
1
double pole double throw switch
1
variable resistor - 17 Ohms
1
ammeter projection - 1A
1
momentary contact switch
1
banana cable
12
banana plug multi adapters
2
wolfvision visualizer
1