Power Extension
Is there a formula for calculating the power lost when using extremely long extension cords?
Is there a formula (preferably a calculator on the web) that can estimate the power lost over long extension cord runs? On the Sears web site they sell a 16/3 cord 100 feet long. It says 13 amps up to 50 feet and 10 amps up to 100 feet. So if I need to connect 4 of these to go 400 feet I want to know about how many amps I would really have available at the end. Also, I would like to do other calculations for going even longer distances up to 900 feet.
An 18ga copper wire will have a resistance of about 6.4ohms per 1000ft. You can figure out how much voltage you will lose using the E=IR formula (voltage drop = current * resistance). remember that the wire distance is twice the length of the cord because the current has to go both ways – out and back.
If the drop is 5v, your device would be trying to run on 105v vs 110v. Lower voltage will deliver less current to your device.
See http://www.powerstream.com/Wire_Size.htm for more info. It has a pretty cool voltage drop calculator
Hide TV Cables with PowerBridge In-Wall Power Extension Kit
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