The power formula for a circuit with a voltage V and current I is P V I P V I You can use Ohms law to express either voltage or current in terms of the resistance R in the circuit. The capacity to do work is termed as Energy. P I 2 x R x Cos F.
Power in physics is the amount of work done divided by the time it takes or the rate of work.
VA is simply the current times the voltage so knowing this and the voltage can give the current. The Energy expended to do work in unit time is termed as Power. The ideal power consumption for a fan without losses can be expressed as Pi dp q 1. One horsepower is equivalent to approximately 750 Watts.