Question

Write the principle and working of a step up transformer can it be used to step up DC voltage ? Justify your answer .

Answer 1

Working of a transformer is based on the principle of mutual induction. Transformer cannot step up or step down a dc voltage because there is no change in magnetic flux. When dc voltage source is applied across a primary coil of a transformer, the current in primary coil remains same, so there is no change in magnetic flux and hence no voltage is induced across the secondary coil. Hence, a step up transformer cannot be used to step up DC voltage .