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The power factor of an alternating current device or circuit is the ratio of active power over apparent power. Power Factor=Cos Theta=active power P (watt)/apparent power S (VA) and it is usually expressed as a simple number, or as a percentage. Because the active power P can never exceed the apparent power S, it follows that the power factor can never be greater than unity (or 100 percent). The power factor of a resistor is 100 percent because the apparent power it draws is equal to the active power. On the other hand, the power factor of an ideal coil having no resistance is zero, because it does not consume any active power. To sum up, the power factor of a circuit or device is simply a way of stating what fraction of its apparent power is real or active power. At Etasis, most of the PSU available are PFC (active PFC) ready and are compliant to EN61000-3-2 EU standard.
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