$$S=V⋅I=P+jQ$$
$$|S|=√{P^2+Q^2}$$
$$P={|S|\,cos(φ)}={|I|^2\,R}={|V|^2}/{|Z|^2}\,R$$
$$Q={|S|\,sin(φ)}={|I|^2\,X}={|V|^2}/{|Z|^2}\,X$$
$$PF=cos(φ)={P}/{|S|}$$
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