how do i convert mA to VA in an AC circuit?

Question

I am trying to find out how many VA in12V AC are there in a 12AC 800mA transformer

Answer 1

Technically, you don't convert mA into VA in any AC circuit! One is a measure of current flow, the other is a measure of power.

Now if you want to figure out the power of the transformer, simply multiply the amperage by the voltage.

P = 12V X 800mA = 12V X 0.8A = 9.6 VA or 9.6 watts.

Now you can think of the power in terms of VARs (volt amp reactive), but those are typically used in where you have either a(an) inductive and/or capacitive load and use imaginary numbers to solve such problems.

Answer 2

VA = Watts. Your transformer is rated at 0.8 Amps, and giving a potential of 12 volts. Transformers MUST be AC, cannot be DC. Therefore, VA = Watts, 12 X 0.8 = 9.6 watts as rated. Transformers are usually under rated, so I would suspect the transformer will not burn out its windings at upto 12 Watts, certain not if for a short time period. Oh, and mA = milliamps (1/1000 amp).

Answer 3

Convert Milliamps To Amps

Answer 4

if you assume that all terms are "rms", then it's simple:

VA = 12 * .8 = 0.96

If the stated values are NOT rms, then there's too much "noise" to give an accurate answer.

NOTE that when you hear of "120 vac", it means RMS, since the peak-to-peak value of the stuff coming out of the wall is typically 170 volts or so.

Answer 5

What is the 12AC ?????????