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Power limit on mains.

  1. Sep 3, 2010 #1
    Sometimes it happens that if you have a lightbulb and something else that is rated high wattage in the same mains outlet (sometimes even on different outlets), and turn the high-wattage appliance, you can see how the lightbulb gets dimmer.
    Why does this happens?

  2. jcsd
  3. Sep 3, 2010 #2


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    Science Advisor
    Gold Member

    It happens because of voltage drop in the wires/connections. Since no conductor is perfect some voltage is lost when high(er) currents are being carried by said conductors due to their resistance. Ohms law and all...
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