Transformer question

[Sandy W5TVW]

At 10:39 PM 11/15/97 +0000, you wrote:
>Hello,
>
>     I have a couple question about a transformer I have that I don't quite
>understand. It's a 117 volt primary and a 12.6 secondary at 2 Amp.  On the
>secondary side I actually read about 13.6 volts and almost no amps. When my
>meter is set on 2 MA I only read .035 or so amps. Am I going about this
>wrong? Does it need a load to draw the 2 amps or is the transformer no
>good? Thanks in advance for any assistance.
>
>Aaron

YES!

        You will need some kind of a load to see what the actual voltage is.
It will drop under a load.
        You will need a resistor.  Ohms law says: R=E/I, or 12.6/2=6.3 ohms.
At full load P=IE or 2 X 12.6=25.2 watts.  If you can find a resistor
(Preferably adjustable) like a 10 ohm or 20 ohm 25 watt or better wirewound,
you can "load" the secondary and measure the voltage.  To measure
current, the ampmeter must ALWAYS be placed in series with the source
of voltage and the load, NOT across the source of voltage!  Assuming you
have an ampmeter capable of measuring AC current.

Does this help?

73,
E. V. Sandy Blaize, W5TVW
"Boat Anchors collected, restored, repaired, traded and used!"
417 Ridgewood Drive
Metairie, LA., 70001

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