View Full Version : Confused
03-01-2006, 12:49 PM
If I have 1 detector that draws 77ma and I am going to install a step down transformer 120v ac - 24v ac how many watts will the transformer need to be rated at?
03-02-2006, 03:27 AM
The dectector runs at 24 volts and 77 ma?
The formula is
watts = volts * amps
You have to convert milliamps to amps first.
24 volts * 0.077 amps = 1.848 watts
Though if the voltage and current are out of phase with each other the load would be higher.
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