For an ideal step-down transformer, the quantity which is constant for both the coils will be

current in the coils

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voltage across the coils

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resistance of coils

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power in the coils

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Solution

The correct option is A power in the coils
For an ideal step - down transformer, power is constant for both the coils.
I.e. Input power = Output power
$∴ V_{p} I_{p} = V_{s} I_{s}$ or $\frac{V_{p}}{V_{s}} = \frac{I_{s}}{I_{p}}$

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