what is a transformer???

 ⃝ ''Transformer is a static electrical device which can transfer the electrical power from one electrical circuit to another electrical circuit through magnetic flux or field without change in supply frequency''

HERE; U1= INPUT VOLTAGE

              U2= OUTPUT VOLTAGE

              I1= INPUT CURRENT

              I2= OUTPUT (LOAD) CURRENT

              N1= PRIMARY WINDING TURNS

              N2= SECONDARY WINDING TURNS

               ∅= MAGNETIC FLUX