ECE 201 Circuit Theory I1 Determining Dot Markings.

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Determining Dot Markings

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Arbitrarily Select One Terminal

• Mark with a dot

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Assign a Current to the Terminal

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Apply the Right-Hand Rule

• Determine the direction of magnetic field established by the current

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Pick one terminal of the second coil

• Assign a current into this terminal

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Apply the Right-Hand Rule

• Determine the direction of magnetic flux established by this current.

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Compare the directions of the fluxes

• If the fluxes have the same direction, place a dot at the terminal where the test current enters.

• If the fluxes have different directions, place a dot on the terminal where the test current leaves.

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Summary

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Let’s Try Some Examples

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