Define what is active power, reactive power, apparent power & power factor

Active, Reactive and Apparent Power

Consider a series R-L circuit connected across voltage of value V draws an current I. Let the current I lags behind the applied voltage by an angle ϕ. In this case there are three types of power drawn by circuit.

Active Power (p)

It is the power which is actually dissipated by resistance in the circuit.

Reactive Power (Q)

It is the power developed in the inductive reactance of the circuit

Apparent Power (S)

It is given by the product of rms value of voltage and value of circuit current.

Therefor, S = VI = (IZ)I = I2Z in volt amp (VA) of kVA Fig. shows a power triangle in which

Power Factor (P.F.)

Power factor is defined as (a) Cosine of an angle of lead or lag P.F. = cos ϕ (b) The ratio of resistance value to impedance value,PF=R/Z .(c) the ratio of true power to the Apparent power value .

A.C. CIRCUITS TOPIC

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  3. Explain what is ac quantity : and Advantages of AC over DC in circuits
  4. What is waveform, amplitude, cycle, time-period, phase & phase difference
  5. Define RMS & average value as applied to A.C. voltage & current
  6. What is form factor? crest factor? peak factor? & power factor? in ac circuits
  7. what is phasor diagram, phasor algebra, leading & lagging ac quantities
  8. Phasor representation of alternating quantities – resistive, inductive, capacitive
  9. What is R-L-C series connection for A.C. circuit ? Explanation
  10. What is series combination of R-L circuit ? Explanation
  11. Define what is active power, reactive power, apparent power & power factor
  12. Explain what is series combination of R-C circuit in electrical engineering
  13. What is simple parallel AC circuits ? Explanation -electrical engineering
  14. Resonance as applicable to simple RLC series circuit? effect on circuit performance
  15. Explain three phase generation of voltage ? electrical engineering
  16. Explain in detail about what is star and delta three phase system ?
  17. Relation between phase voltage & line voltage in case of balanced star connected load
  18. relationship between line current & phase current for delta connected 3 load
  19. Relation between power consumed in a balanced star & delta connection

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