The correct answer is 600v is the voltage of the secondary of a transformer.
A transformer is an electrical apparatus that manipulates the level of voltage flowing through any point in a power grid. In a distribution system, the transformer decreases the voltage traveling through power lines to a level more suitable for residential and commercial use.An electrical device that can change the A.C. current is known as a transformer. Principle – A transformer works on the principle of mutual induction. Mutual induction is the phenomenon by which when the amount of magnetic flux linked with a coil changes, an E.M.F. is induced in the neighboring coil.
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