A 480/120 VAC 3-phase transformer has impedance 10 Ω. Find the change in impedance when the primary voltage is reduced t

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A 480/120 VAC 3-phase transformer has impedance 10 Ω. Find the change in impedance when the primary voltage is reduced t

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A 480/120 VAC 3-phase transformer has impedance 10 Ω. Find thechange in impedance when the primary voltage is reduced to 400 VAC.[Assume the current stays the same. Answer: 3.5 Ω.]
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