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Wattmetro A Basso Cos Fi - Dubbio

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Avendo un wattmetro a basso cos fi (0,2) se ricordo bene per calcolare la costante si applica la formula

K= [(Pa x Pv)/f.s] x cos fi

Dove Pa e Pv sono le portate amperometrica e voltmetrica del wattmetro, f.s. rappresenta il n° di divisioni della scala, ed il cos fi equivale a 0,2.

E' giusto o sbagliato?

Ringrazio anticipatamente

Ciao. :)

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