Reza mentioned the term 'tap changer'. Do a search online and find out what a tap changer is.

Question

Reza mentioned the term 'tap changer'.  Do a search online and find out what a tap changer is.

Answer

It changes the number of windings on the transformer, thereby changing the voltage output of the transformer

Answer

It is an emergency device for shutting off the power if the voltage gets too high

Answer

It stop the electrical pipes from leaking

Answer

It allows the amount of watts to be increased or decreased

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