1. Chapter 2: AC Circuit
MOHD ASRI BIN JUSOH

2. Chapter 2.6: Average Power, Apparent Power, Reactive Power, Power Triangle

3. Average Power (P)
Average power (P) called as real power defined by power delivered to the load and dissipated to the load.
Unit = Watt

4. Average Power (P) (Cont…)
For purely resistive

5. Average Power (P) (Cont…)
For purely inductive and capacitive

6. Apparent Power (S)
Apparent power (S) defined by power delivered to the load with no concern for the components of the load.
Unit = Volt-Ampere

7. Apparent Power (S) (Cont…)

8. Reactive Power (Q)
Reactive power (Q) associated to any load is defined by
Unit = Volt-Ampere Reactance

9. Reactive Power (Q) (Cont…)
For purely inductive circuit

10. Reactive Power (Q) (Cont…)
For purely capacitive circuit

11. Power Triangle
Average power (P), apparent power (S) & reactive power (Q) can be related in the vector domain by

12. Power Triangle (Cont…)
For inductive load
For capacitive load

13. Power Triangle (Cont…)
To find total P, Q & S:
- Find average power (P) & reactive power (Q) for each element.
- Calculate apparent power (S) using
- Calculate total real power (PT) and total reactive power (QT) by sum all real power (P) and reactive power (Q) value of all element
- Total apparent power (ST) can be calculated by using

14. Power Triangle (Cont…)