On 4/9/2011 2:30 PM A. Baum spake thus:

An amp meter goes in series with the secondary (or primary) of the
transformer. You can convert amps to volt-amps by multiplying volts times
amps. 24 volts times 1 amp = 24 volt-amps. I don't remember if
transformers are rated differently for the primary or secondary or which
one is usually used. It might be in the technical data usually packed
with the transformer or stamped on the transformer somewhere.

Using the primary side would be more conservative (= a bit safer), since
it will include any losses between primary and secondary sides. But it
really doesn't matter. And I'd much prefer to measure current on the
secondary side, rather than deal with 120-volt juice.

He still has the problem of finding an AC ammeter, since a DMM won't
handle AC current.


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