**State and explain ac quantity : and Advantages of AC over DC**

## AC Quantity

An **electrical quantity** that changes its polarity at regular intervals of time and has a zero average value over one cycle is called the **alternating quantity**. It may be a voltage, current or power, Normally it is abbreviated as **a.c. quantity**. Alternating quantities can be of many types viz, sinusoidal, cosine, square, rectangular, triangular, complex etc., show in fig. below Mathematical expression of sinusoidal a.c. voltage in given by

## Advantages of AC over DC

- It is possible to use a
**transformer**. - Distribution efficiency is high.
- Generation is easy.
- Design of a.c. machine is easy.
- Installation is less costly.

## 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

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