SSC SSC JE Electrical 2025 Mock Test Series (Paper 1 & Paper 2) Electrical and Electronics Measurements Measurement of Power Measurement of AC Power
Measurement of power factor for balanced load by two wattmeters for lagging power factor is:
1
\(\tan \phi = \sqrt 3 \left( {\frac{{{W_1} + {W_2}}}{{{W_1} - {W_2}}}} \right)\)
2
\(\tan \phi = - \sqrt 3 \left( {\frac{{{W_1} - {W_2}}}{{{W_1} + {W_2}}}} \right)\)
3
\(\tan \phi = \sqrt 3 \left( {\frac{{{W_1} - {W_2}}}{{{W_1} + {W_2}}}} \right)\)
4
\(\tan \phi = - \sqrt 3 \left( {\frac{{{W_1} + {W_2}}}{{{W_1} - {W_2}}}} \right)\)