where R is resistance, G is conductance, X is reactance, and B is susceptance. These lead to the complex number identities R = G G 2 + B 2 , X = − − B G 2 + B 2 , G = R R 2 + X 2 , B = − − X R 2 + X 2 , which are true in all cases, whereas R = 1 / G is only true in the special cases of either DC or reactance-free current.