if that's the equation for voltage (ohm's law) it's E, not V.
there's a thing called amperage drop when it comes to electricity. the further the wire the more drop. why too far is important but I've never had an effect concerning stat wire. I have had issues with 100' extension cords and vacuum pumps and electric saws. They simply wouldn't turn on, I had to use my 50' cord.
When did it change? When studying EE it was V. And i for current in one class then i for square root of -1 in next. Then j for that in next.
Anyway V=IR gives you the voltage drop once you calculate the resistance of the wire. Which for HVAC use under 50 ft is usually treated a 0 ohms and thus 0 volts drop. It's more of a rounding error in this case.
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