This chapter covers the impedance matching and energy conversion part (3): example problems on Smith chart, transformers, and induction motors are mainly covered. First, an example problem of matching circuits and formula for calculating C and L are explained. Other solutions for example problem are presented. Next, inductive coupling circuits for transformers and induction motor are discussed. Equivalent circuits of a transformer and an induction motor are covered. Three-phase induction motor characterization are discussed with a circle diagram. The chapter is concluded by the conclusions and exercise problems.