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4hv.org :: Forums :: General Chatting
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Dimming lights.

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StormInABottle
Thu Mar 14 2013, 03:00PM Print
StormInABottle Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
Ever noticed that when you draw a giant arc. The lights in the room become dimmer the more you stretch the arc. Anyone has a explanation for this?
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Inducktion
Thu Mar 14 2013, 03:14PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Simple, you're drawing a lot of current from the mains. The current draw lowers the amount of voltage that can be available to everything else in that branch of your house so they get dimmer.

It's kind of the same idea that happens when something large is turned on, like a washing machine, or a dishwasher, drain disposal, etc, the lights all dim for a brief second because the initial current draw is very very high.
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StormInABottle
Thu Mar 14 2013, 04:03PM
StormInABottle Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
Thanks alot for your explanation :D. Poor mains :P
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Dr. Slack
Thu Mar 14 2013, 05:50PM
Dr. Slack Registered Member #72 Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Are you sure it's not your eyes shutting down for the bright arc, seeing the lights as dimmer?
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StormInABottle
Thu Mar 14 2013, 06:16PM
StormInABottle Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
Maybe. :/
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Houdini0118
Thu Mar 14 2013, 06:58PM
Houdini0118 Registered Member #8558 Joined: Thu Dec 06 2012, 11:38PM
Location: usa
Posts: 57
it's not its voltage sag. It happens every time my drill press stalls or i turn it on. also heat guns do this a lot to.
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StormInABottle
Thu Mar 14 2013, 08:41PM
StormInABottle Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
Okay. So voltage sag. But also remember. When the US used to detonate hydrogen bombs. Everything away from the large fire ball is waay dark. Tho the bomb is detonated in the middle of the morning. and large arcs are blindingly bright. So i guess it is a combination of booth.
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Physics Junkie
Thu Mar 14 2013, 09:04PM
Physics Junkie Registered Member #7267 Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
i guess you could speculate the brightness thing. But I get the dimm lights when turning on a vacuum or small space heater which draws a lot of power and neither have anything bright on them.
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GrantX
Fri Mar 15 2013, 04:02AM
GrantX Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
My barn is supplied by a very long underground line, so I get a little bit of voltage drop when running large loads, but the lights usually only dim when switching on a big inductive device (large inrush current).

The underground line is 16mm^2 and about 60-80 metres long.
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StormInABottle
Fri Mar 15 2013, 06:54AM
StormInABottle Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
Thanks :D. :). Atleast i do not think it is a large electrostatic field now haha :P
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