a) \(P=I.U\Rightarrow I=\dfrac{U}{P}=\dfrac{220}{528}=\dfrac{5}{12}\left(A\right)\)
b) \(R=\dfrac{U}{I}=\dfrac{220}{\dfrac{5}{12}}=528\left(\Omega\right)\)
c) \(R=\dfrac{U}{I}=\dfrac{110}{\dfrac{5}{12}}=264\left(\Omega\right)\)
\(P=\dfrac{U^2}{R}=\dfrac{110^2}{264}=\dfrac{275}{6}\left(W\right)\)