Question

steup and stepdown in transformer ....
plzz explain​

Answer 1

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In the National Grid, a step-up transformer is used to increase the voltage and reduce the current. ... Before reaching the end user, a step-down transformer , reduces the voltage from the transmission voltage to the safer voltage of 230 V for home use.

Answer 2

Answer:

here is explanation

Explanation:

A transformer that increases the voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer. Conversely, a transformer designed to do just the opposite is called a step-down transformer.

Reversibility of Transformer Operation

In case you were wondering, it is possible to operate either of these transformer types backward (powering the secondary winding with an AC source and letting the primary winding power a load) to perform the opposite function: a step-up can function as a step-down and visa-versa.

efficient operation of a transformer requires that the individual winding inductance be engineered for specific operating ranges of voltage and current, so if a transformer is to be used “backward” like this it must be employed within the original design parameters of voltage and current for each winding, lest it prove to be inefficient (or lest it be damaged by excessive voltage or current .