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Question: The voltage drop on a #10 AWG solid THHN uncoated copper conductor on a 120v circuit is 85' long and connected to a 2HP single phase motor is ?

When I use the 2K x L x I / Cm= VD formula I come up with 5.06v (INCORRECT)

The testing software has it simply at VD= I x R which gives me the correct answer of 4.94v

This simple formula (not listed in Uglys) is working and the other isn't. WHat am I not seeing here?!