I'm wiring a transformer to give me 240V output from 120V source, and I noticed that it's drawing 2.7A from the 120V side when there is no load attached. So that got me thinking, what's the inductance of this thing? My Kill-A-Watt meter says input is 120V, 60Hz, 2.7A and pF of 0.20.

Using this formula:

L = V / (ωI)

Where

- L is the inductance in Henrys

- V is the peak-to-peak voltage across the inductor

- I is the current flowing through the inductor in amps

- ω is the angular plot frequency of the waveform in radians per second.

So this is where I think I'm missing something.

V = 340V (120V RMS is 170V peak, but V is peak-to-peak which would be 340)

ω = 2*(pie)*60Hz = ~377

I = 2.7 RMS (I suspect I should use peak here, not RMS? Ipp = 7.6)

Plug all this in, and I get 0.334H using RMS current, or 0.119H using peak-to-peak current. How far off am I?