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Just for fun: AC vs DC high-current switching

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Frank Koenig:
I ran across the video on an electric vehicle forum. Pretty cool, I thought.

--Frank

https://youtu.be/Zez2r1RPpWY

Mike Sokol:

--- Quote from: Frank Koenig on December 07, 2017, 10:39:35 PM ---I ran across the video on an electric vehicle forum. Pretty cool, I thought.

--- End quote ---

Yes, very cool indeed. Looks like one of my tabletop demonstrations. Of course the reason that the AC side has no visible arc when opening the switch is that AC shuts off 120 times per second in the US, and 100 times per second in Europe. While the DC is continuous and thus will keep the arc going until the gap gets too great.

Robert Lofgren:
Cool!

Keith Broughton:
Cool demo!
Another reason to not use Edison's DC power distribution.
That said, the elements heat up much faster with DC.

TJ (Tom) Cornish:

--- Quote from: Keith Broughton on December 08, 2017, 08:32:12 AM ---Cool demo!
Another reason to not use Edison's DC power distribution.
That said, the elements heat up much faster with DC.

--- End quote ---
That's the initial observation, but assuming the 220v AC is RMS, the heating power of A/C and D/C are actually the same.  If it was 220v peak, then yes, DC has more power at a given voltage.

I presume the reason the elements heated faster with D/C is they were already warm.

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