help me choose a variac

mightymike · Post by **mightymike** » Fri Nov 03, 2006 8:02 am

Yeah but how many ohms when you're cranked on 10?

Voltage drop across the choke, divided by the current measured in series with the choke will give you this number. E/I =R

Then if you want, take that number and divide it by 753.98 to see how many Henries she's putting out when cranked on 10.

BashCoder · Post by **BashCoder** » Fri Nov 03, 2006 10:13 am

Wait a sec - inductors in an AC circuit are reactive. So wouldn't any such measurements be frequency dependent?

mightymike · Post by **mightymike** » Fri Nov 03, 2006 10:26 am

The frequency is constant 120hz ripple dc.

the 753.98 = 2pi120

BashCoder · Post by **BashCoder** » Fri Nov 03, 2006 10:29 am

Thank you