Electricity is denoted by [VA] and [W]
Calculation for direct current:
Electricity (W) = voltage (V) × current (A)
Alternating current will change periodically not fix as direct current
Not all the product of voltage and current are consumed by the load.
For direct current, the power consumed purely by the load is called active power.
Active power (W) = Actual value of voltage (V) × Actual value of current (A) × Power factor (cos θ)
There is also power (reactive power) that does not actually work.
The power indication is called apparent power
Apparent power (VA) = actual value of voltage × actual value of current.