16 thoughts on “Why outlets spark when unplugging – EMF & Inductors”

  1. Amazing video! I would have loved if you would have continued to go deeper into the topic with Special Relativity.
    I understand how a magnetic field is understood using Special Relativity. But I have no idea why a change in magnetic flux induce an emf.

  2. search YouTube for "500KV Substation arc" for an extreme example
    Power lines have inductance too and really don't like it when you try to break the circuit

  3. there appears to be a speck of dirt on the lens of your camera and i thought it was dirt on my screen

  4. Does the spark get smaller when you put something so heavy on the inductor that it can't be moved without the build-up from unplugging?

  5. hahahahahha such a awesome badass video !! one of the biggest spark I have ever seen I tell ya !!

  6. Very interesting, and a very good explanation!
    On an unrelated note: were you ever in some sciencey tv show called "how to build everything"?

  7. the statement about car ignition is somewhat incorrect.
    Somewhere along the line the term ignition got used for two different things.
    There is the ignition which is the switch that that you turn with the key.
    Then there is the ignition that is part of the spark system that ignites the fuel mixture in the combustion chamber.
    what was referenced sounds like the points ignition system which was used before electronic ignition took over.

  8. More demonstrations like this! I took plenty of physics courses too and never saw the oxygen one either. Also, please put your face in the thumbnails. I almost scrolled past this video!

  9. Inductors don't "like" any change in the current flowing through them. So right after you close the switch current is zero, then slowly rises to a maximum. Then right after you open the switch the current is at a maximum (even though the switch is open, hence the arc), then as the current falls toward zero the arc dies.

Leave a Reply