Active, reactive and apparent power

In this slide active, reactive and apparent power are explained

1. Active Power? Reactive Power? Apparent Power?

2. Active Power Reactive Power Apparent Power AC Circuits DC Circuits DC Power

3. Instantaneous Power V, I t

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5. Instantaneous Power V, I t

6. Instantaneous Power V, I t

7. Instantaneous Power V, I t # Positive # Negative

8. Instantaneous Power V, I t # Positive # Negative Positive Power

9. Instantaneous Power V, I t # Positive # Negative Negative Power

10. V, I t + - Active Power

11. V, I, P t + - Active Power

12. V, I, P t + - Active Power

13. V, I, P t + - Active Power # In case of Resistive Load Instantaneous Power always remain Positive # Active Power is always responsible for useful work # Active Power is represented by “ P” and is given by relation by “ P = V I Cos θ ” and its unit is “ Wat t”

14. V, I t + - Reactive Power

15. V, I, P t + - Reactive Power

16. V, I, P t + - Reactive Power

17. V, I, P t + - Reactive Power

18. V, I, P t + - Reactive Power # Reactive Power becomes positive and negative also # Reactive power oscillates between source and load and do not take part in useful work done # Reactive Power is represented by Q = V I Sin θ and its unit is Volt Ampere Reactive or VARs # Reactive Power; Inductive VARs, Capacitive VARs and Watt less Power

19. V, I t + - Reactive Power

20. V, I t + - Reactive Power

21. Active Power P = V I Cos θ Watt P = V I x 1 = V I Watt Reactive Power Q = V I Sin θ VARs Q = V I x 0 = 0 VARs Apparent Power S = V I Volt Amp S = P, Q = 0 Active Power P = V I Cos θ Watt P = V I x 0 = 0 Watt Reactive Power Q = V I Sin θ VARs Q = V I x 1 = V I VARs Apparent Power S = V I Volt Amp S = Q , P = 0 Active Power P = V I Cos θ Watt P = V I x 0 = 0 Watt Reactive Power Q = V I Sin θ VARs Q = V I x 1 = V I VARs Apparent Power S = V I Volt Amp S = Q, P = 0

22. Active Power P = V I Cos θ Watt P = V I x 0.8 Watt Reactive Power Q = V I Sin θ VARs Q = V I x 0.6 VARs Apparent Power S = V I Volt Amp S = V I

23. Thank You