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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.
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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