**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 = I^{2}Z 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

- Introduction Of AC Circuits In Electrical Engineering
- How emf is induced in single phase system ? single phase generation .
- Explain what is ac quantity : and Advantages of AC over DC in circuits
- What is waveform, amplitude, cycle, time-period, phase & phase difference
- Define RMS & average value as applied to A.C. voltage & current
- What is form factor? crest factor? peak factor? & power factor? in ac circuits
- what is phasor diagram, phasor algebra, leading & lagging ac quantities
- Phasor representation of alternating quantities – resistive, inductive, capacitive
- What is R-L-C series connection for A.C. circuit ? Explanation
- What is series combination of R-L circuit ? Explanation
- Define what is active power, reactive power, apparent power & power factor
- Explain what is series combination of R-C circuit in electrical engineering
- What is simple parallel AC circuits ? Explanation -electrical engineering
- Resonance as applicable to simple RLC series circuit? effect on circuit performance
- Explain three phase generation of voltage ? electrical engineering
- Explain in detail about what is star and delta three phase system ?
- Relation between phase voltage & line voltage in case of balanced star connected load
- relationship between line current & phase current for delta connected 3 load
- Relation between power consumed in a balanced star & delta connection

*Thank for Visiting www.electricaltpoint.com for more electrical and other related posts be with us*.