1. POWER IN AC CIRCUIT BY Group

2. GROUP  MUHAMMAD UMER FAROOQBS-P-13-28  MUHAMMAD FAISAL KHANBS-P-13-57  MUHAMMAD AKHTARBS-P-13-31  MUHAMMAD USMAN NAJEEBBS-P-13-67

3. Power  Mechanics rate of doing work per unit time P=W/t  CIRCUIT The work done dW by a source of emf to unit charge dq is given by dW= Ɛ dq the rate of doing work by source of emf to unit charge in unit time called power. P=dW/dt

4. POWER A.C D.C

5. Cases

6. DERIVATIONS

7. In RLC circuit

8. Power factor

9. Phase angle  an angle representing a difference in phase, 360 degrees (2π radians) corresponding to one complete cycle.  The angle between two alternating quantities PHASOR DIAGRAM the diagram in which phasors represented by the open arrows, rotate counterclockwise with an angular frequency about the origin.

10. Properties of phasor diagram  The length of phasors proportional to max. value of alternating quantity  Projection of phasor on a vertical axis instantaneous value of alternating quantity arrows on vertical axis represent the time varying quantities

11. Phase Angles

12. resistance circuit waveform phasor daigram

13. Capacitor circuit

14. Inductor circuit

15. RLC circuit

16. Power companies  frequency 60Hz  Not concerned whether you use purely resistive device in which power dissipated in phase with the source of emf or partialy capacitive or inductive device. as motor

17. Power companies measurement Two cases 1. if the power companies measured your energy use in a time smaller than 1/60 s they would notice variations in the rate at which you use energy. 2. measuring over a time longer than 1/60 s only the average rate of energy consumption becomes important.

18. Question & Answer

19. SPECIAL THANKS  DR. FAYYAZ HUSSAIN

20. THANKS GROUP MEMBERS

21. THANKS BY GROUP MEMBERS