How to convert VA to watts

How to convert apparent power in volt-amps (VA) to real power in watts (W).

VA to watts calculation formula

The real power P in watts (W) is equal to the apparent power S in volt-amps (VA), times the power factor PF:

P(W)S(VA) × PF

So watts are equal to volt-amps times the power factor.

watts = volt-amps × PF

or

W = VA × PF

Example

What is the real power in watts when the apparent power is 3000 VA and the power factor is 0.8?

Solution:

P = 3000VA × 0.8 = 2400W

Volt-ampere (VA) definition

A volt-ampere (SI symbol: V⋅A or V A; also VA) is the unit used for the apparent power in an electrical circuit. The apparent power equals the product of root mean square voltage and root mean square current. In direct current (DC) circuits, this product is equal to the real power in watts. Volt-amperes are usually used for analyzing alternating current (AC) circuits. The volt-ampere is dimensionally equivalent to the watt (in SI units, 1 V⋅A = 1 W). VA rating is most useful in rating wires and switches (and other power handling equipment) for inductive loads

For a simple electrical circuit running on direct current, the electrical current and voltage are constant. In that case, the real power (P, measured in watts) is the product of the electrical current (I, measured in amperes) and the voltage from one side of the circuit to the other (V, measured in volts):

P = I × V

However, for alternating current, both the voltage and current fluctuate over time. The apparent power (S, measured in volt-amperes) is calculated using the root mean square voltage (Vrms, measured in volts) and root mean square current (Irms measured in amps):

S = Irms × Vrms 


Watt definition

Watt is the unit of power (symbol: W).

The watt unit is named after James Watt, the inventor of the steam engine.

One watt is defined as the energy consumption rate of one joule per second.

1W = 1J / 1s

One watt is also defined as the current flow of one ampere with voltage of one volt.

1W = 1V × 1A

How to convert watts to VA »


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