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A model train set will need a transformer to power it. On most modern train sets the power of the transformer is usually between 8 and 18 volts and will differ by manufacturer.

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12y ago

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A model-train transformer plugs into 120 V ac and draws 0.30 A while supplying 5.3 A to the train What voltage is present across the tracks Assume 100 percent efficiency is this a step-up or step down?

The power supplied to the train set from the wall is (120 x 0.3) = 36 watts.If the transformer is 100% efficient, then the same 36 watts is delivered to the train.The power delivered to the train = (E x I).5.3 E = 36E = 36/5.3 = 6.79 volts (rounded).In the lingo of transformers, the voltage is considered to be the independent variable, and even though thecurrent on both sides is also tied to the turns ratio, the convention is that the concept of step-up and step-downis tied to the voltage. So the train transformer is a step-down, in the ratio of (120/6.79) = about 18 to 1.