Why Does Transformer Coil Ratio Halve Current Despite Doubling Voltage?

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Yuqing
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If a transformer with coil ratios 2:1 creates a voltage twice that of the primary in the secondary coil why is the current halved? I realize that this is a consequence of the conservation of energy, but there must be a physical reason behind this. What is causing the additional impedance that halves the current even though the voltage is doubled?
 

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