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What voltage is present across the tracks? Assume 100% efficiency.?
A model-train transformer plugs into 120-V ac and draws 0.45A while supplying 5.9A to the train.
Power = Voltage * Current.
Since you are assuming 100% efficiency, that means that power in = power out. So 120 * 0.45 = V * 5.9, solve for V.


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