**Root mean square value (RMS value)**

It is that value of **d.c. curren**t which when flowing through a given circuit for a given time produces the same heat as produced by the alternating current when flowing through the same **circuit** for the same time.

**RMS value in terms of voltage:**

where,** V _{m}** – maximum voltage

The mean of the squares of the instantaneous values of voltage over one complete cycle (T).

**Mean or Average value**

The average value of an **alternating current **is that **dc current** which transfers across any circuit the same charge as is transferred by that alternating current during the same time. Average value can be calculated as

But, average value of a symmetrical **alternating waveform** is always zero because it has equal negative and positive values. hence average value over a complete cycle is zero. We will calculate average value for half cycle.

## 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 â€“ 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

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