This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
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Post by burke » Wed Oct 05, 2005 9:26 am

how do you copute voltamps 120/24 vac transformer
with 100va output how is that in amps?

Robert Reed
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Re: voltamp

Post by Robert Reed » Wed Oct 05, 2005 9:59 am

With Ohms law--P/E--100/ 24--4.15 amps. This may or may not be true power,but you cannot exceed this limit. If there is phase angle involved, this will be apparent power, with in phase I & E this will be true power.

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Re: voltamp

Post by Enzo » Wed Oct 05, 2005 5:14 pm

power in equals power out.<p>120VAC in and 24VAC out: a five to one ratio.<p>A five amp draw from the 24VAC will result in a one amp draw by the 120VAC side.<p>If the transformer has 100va rating, then the 24VAC can provide about 4 amps. (24v x 4A = 96va)<p>On the primary side this means a little less than one amp draw.

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