A Transformer is an electrical device that uses electromagnetic induction to change the voltage of alternating current (AC) from the input to the output of the transformer. Transformers do not pass DC current and are only on AC current. Step down transformer take the primary voltage and covert to a higher secondary voltage. Step up transformers take the primary voltage and concert to a lower secondary voltage. One to One transformers have equal primary and secondary voltages and are primarily used for providing DC isolation.

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