## Important Topic on A.C. Fundamentals

**1- What is Frequency?**

Frequency is the Reciprocal of Time Period.

**F = 1/T**, Unit - Hz

It also defines the Number of Oscillation per unit time.

F = No. of Oscillation / Unit Time

**2- What is Angular Frequency in Electrical Engineering?**

Angular Frequency is Define as the Angular Displacement covered in one Second.

**ω = 2π/T = 2πF**

**3- Type of A.C. Function**

Any A.C. (Alternator Current) Function has Four Values

*1- Instantaneous*- Any A.C. Function which depends on time is known as instantaneous A.C. Function.

**V = Vm Sin ωt**or

**I = Im Sin ωt**

*2- Average*- It is that value of A.C. Function which is equivalent to D.C. Value.

*3- Peak*- Peak Value is the Maximum value of any A.C. Function.

*4- RMS*- RMS is Root Mean Square Value of any A.C. Circuit.

**4- What is Capacitor?**

A Capacitor is formed when two plates (conductor) are separated by a gap distance through a dielectric.

A Capacitor opposes any change in the voltage it stores energy in the electrostatic field.

Definition - A Capacitor is Define as the charge per unit voltage.

**C = Q/V**, Unit = Farad

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