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Power factor calculationHow to calculate the ratio of resistive and reactive load if the impedance/resistance is not measurable?
http://www.ibiblio.org/kuphaldt/elec...html#02216.png As a practical example, I’d like to measure the cos(phi) of an energy saving light bulb which states to consume 8W but measures 230V * 0.057A = 13.1W. Of course, believing the manufacturer is the easiest, 13.1W – 8W gives a power factor of 0.61 but I'd like to verify. Out of circuit, the bulb has an infinite resistance probably caused by the internal ignition circuit. /Hugo |

Hi,
Said bulbs have a complex supply / ignition circuit. You cannot derive the power factor from that simple formula. Only way I know of is a small additional resistor and an oscilloscope. :)/sreten. |

Say a 10ohm resistor in series and go from there?
/Hugo |

Hi,
Yes. With an oscilloscope you can then see the current and its relationship with input voltage. May not be continuous. :)/sreten. |

Thanks.
Would there be a way to compensate these bulbs for a higher power factor. I calculated a 457µF (!) capacitor would bring the power factor close to 1. Apart from the fact that its rather silly to do, I'm trying to get a grasp of the basic math. /Hugo |

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