A Transformer is a static electrical device which consists mainly of an iron core and a coil. The coil has two or more windings. The windings connected to the power supply are called primary windings and the others are called secondary windings.
Transformers are widely used in household appliances, electronic instruments, switching power supplies and other electrical equipment. The transformer circuit symbol usually begins the number,
Check the ETD Transformer , EI Transformer design, 8 Pins Transformer , Switching Mode Transformer pictures.