The individual components in parallel or series can be combined into general impedances or admittances. Actual impedances and admittances must be normalised before using them on a Smith chart. Capacitive admittances have positive imaginary parts and inductive admittances have negative imaginary parts. The theorem can be extended to admittances and the encompassing concept of immittances. This has been corroborated by an analysis of cascaded sheet admittances. In the diagram below, all shunt admittances are referred to the primary side.