"Watson A.Name - "Watt Sun, the Dark Remover""
wrote in message ...
Suppose that I have an inductor that's covered with epoxy or similar
that prevents me from seeing or finding out how many turns of wire
are
on the core. The core is open, so that it's uncovered and most of
the
magnetic field is outside outside of the inductor. Obviously it's a
bobbin type core.

The voltage ratio of a transformer is the same as the turns ratio.
Therefore, wind ten turns around the inductor and measure the voltage
at the output when a known voltage is applied to the inductor.

Norm Strong