Alternating Current

• If two signals have exactly the same frequency and cross the zero line at different times they have a phase difference
• The red wave crosses the zero line ninety degrees before the black.  It leads the black by 90° or ¼ cycle.  The black lags the red by 90°  (one cycle is 360°)

Course Guide Topics

1. Sinusoidal Signals (1)
2. Sinusoidal Signals (2)
3. Sinusoidal Signals (3)
4. Alternating Current
5. Phase
6. Harmonics
7. Non-Sinusoidal Signals (1)
8. Non-Sinusoidal Signals (2)
9. Capacitive Reactance (1)
10. Capacitive Reactance (2)
11. Inductive Reactance