Some questions about unbalanced loads three phase system. 1)If I know each loads’ active power(PR PY & PB), then I want to find the total active power, is it just PR+PY+PB? 2)Same situation of reactive power, the total reactive power, is it just QR+QY+QB? 3) If 1 and 2 are correct, then I find the power factor of each loads are lower than 0.5, but the total power factor can higher than 0.5, why? electricalengineering