CCommunity
- The transformer works on the principle of mutual induction, for which current in one coil must change uniformly
- If dc supply is given, the current will not change due to constant supply and transformer will not work
- Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero
- Practically winding resistance is very small
- For dc, the inductive reactance is zero as dc has no frequency
- So total impedance of winding is very low for dc
- Thus, winding will draw very high current if dc supply is given to it
- This may cause the burning of windings due to extra heat generated and may cause permanent damage to the transformer