Define RMS & average value as applied to A.C. voltage & current

Root mean square value (RMS value)

It is that value of d.c. current 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.

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A.C. CIRCUITS TOPIC

1. Introduction Of AC Circuits In Electrical Engineering
2. How emf is induced in single phase system ? single phase generation .
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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