1. Determining Dot Markings
ECE 201 Circuit Theory I

2. Arbitrarily Select One Terminal
Mark with a dot
ECE 201 Circuit Theory I

3. Assign a Current to the Terminal
ECE 201 Circuit Theory I

4. Apply the Right-Hand Rule
Determine the direction of magnetic field established by the current
ECE 201 Circuit Theory I

5. Pick one terminal of the second coil
Assign a current into this terminal
ECE 201 Circuit Theory I

6. Apply the Right-Hand Rule
Determine the direction of magnetic flux established by this current.
ECE 201 Circuit Theory I

7. 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.
ECE 201 Circuit Theory I

8. Summary
ECE 201 Circuit Theory I

9. Let’s Try Some Examples
ECE 201 Circuit Theory I

10. ECE 201 Circuit Theory I

11. ECE 201 Circuit Theory I

12. ECE 201 Circuit Theory I

13. ECE 201 Circuit Theory I