Question

why current voltage changes but frequency power vonstant in transformer

Answer 1

Answer:

the frequency the Primary AC had will be transmitted to the secondary AC via core. ... It is clear that the frequency of output/induced voltage Vin is ω which is same as that of the input current. Hence, in a transformer, the frequency remains unchanged (constant) as flux changes.

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Answer 2

Answer:

the Primary AC had will be transmitted to the secondary AC via core. the frequency of output/induced voltage Vin is ω which is same as that of the input current. thus, in a transformer, the frequency remains unchanged (constant) as flux changes