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Electrical Tranformer Polarity Schematic

Beyond the basic transformer symbol, polarity marks can be used to illustrate the direction of current flow within the circuit. This helps determine the phase relationship (or polarity) between the input and output terminals of a transformer. Typically, these marks are represented as dots on the transformer's symbol, as depicted in the image.

The dot on the primary side of the transformer indicates where the current enters; conversely, on the secondary side, the dot signifies where the current exits.

To explain further, if at any moment the current enters the transformer at the dotted terminal of the primary coil, it will simultaneously exit at the dotted terminal of the secondary coil. The image provides a visual representation of this current flow using the dot notation.