## Form factor

**Form factor **is defined as the ratio of RMS value to the Average value. It is denoted as K_{f}

### (a) In terms of a.c. current

**form factor** for **sinusoidal waveform** is 1.11. It has no unit.

### (b) In terms of a.c. voltage

**Crest factor or Amplitude factor**

**Amplitude factor** is defined as the ratio of maximum value to **RMS value**. It is denoted as K_{a}

therefore, **Crest factor** or **Amplitude factor**,

### (a) In terms of a.c. current

### (b) In terms of a.c. voltage

**Crest factor** for **sinusoidal waveform** is 1.414, It has no unit.

**Peak factor**

It is defined as the ratio of maximum value to the RMS value of an alternating quantity.

**Power factor**

The **power factor** is defined as the cosine of the angle between **voltage and current** in an circuit.

## Instantaneous value related to A.C. circuit

The value of an alternating quantity, i.e. voltage or current at any instant, is called its instantaneous value and is represented by ‘e’ or ‘i’ respectively.

here, are instantaneous value of **current** at time t1, t2 and t3.

## 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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