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Voltage Drop across 26AWG wire over long lengths?

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mav1234

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How to determine the voltage drop across a long wire (gauge: 26AWG) over several feet?

For example, I have a 5 feet wire of gauge 26AWG and if 3.3V is applied at one end and receiver device sinks about 1A... what would be the voltage drop at the other end??

I am asking this question to determine voltage drop across wires of varying lengths and different source voltages.
 

The resistance of 16 AWG copper wire is 133.9 ohm/1000m
 

You can use different approaches to find the volt level at your receiving device:

* Calculate ohm value of 5 ft of 26 AWG. Multiply by amperes to obtain voltage drop. Subtract from 3.3 to obtain volt level on receiving device.

* Calculate ohm value of 5 ft of 26 AWG. Calculate ohm value of receiving device. Use proportions to calculate volt level across each.

Etc.

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Links to charts of wire gauges showing resistance values, safe amp-carrying capacity, etc.:

http://amasci.com/tesla/wire1.html



http://www.powerstream.com/Wire_Size.htm

Here's a link to another wire gauge table. Its ampacity values are much different than the other tables.

**broken link removed**

Possible reason for the disparity: One source may base ampacity on a higher temperature which makes the wire get too hot to hold, while the other source may use a lower temperature where copper's electrical characteristics start to change even though it is only warm.
 

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