1. The Transformer (Primary has N P turns) (Secondary has N S turns) The source side is called Primary The load side is called Secondary

2. 1. When current in the primary coil changes being alternating in nature, a changing magnetic field is produced 2. This changing magnetic field gets associated with the secondary through the soft iron core 3. Hence magnetic flux linked with the secondary coil changes. 4. Which induces e.m.f. in the secondary. Principle of operation of Transformer

3. Ideal Transformer 1.The resistance of the coils are zero. 2.The relative permeability of the core in infinite. 3.Zero core or iron loss. 4.Zero leakage flux

11. Unsolved Example N 1 :N 2 = 1:2 i) Find I 1, I 2 in the above ideal transformer. ii) What is the reflected (referred) load impedance on the primary side iii) If the resistance is replaced by (a) 100 mH inductor (b) 10  F capacitance; what will be the reflected load impedance on the primary side?