VA is total power, Watts is real power
real power in your circuit performs WORK (i.e. useful output). some of your supply's input power does this work (hopefully most of it) but some goes off to perform other functions, such as "establishing the field" and so forth.
total power = real power + reactive power
S = P + jQ
where the units are:
VA = Watt + VAR
VA is the power delivered if the load is purely resistive.... if the load has capacitance or inductance in it, this power gets divided into two parts, real (Watt) and reactive (VAR)..... where real part is the one that does the actual work, while reactive is used in energizing and establishing field, the relationship is not simple algebraic but complex
VA = voltage × current;
watts = Voltage × Current × Power factor
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