It is a unit in which the capacitor can be specified very small.

it is important to understand what a microfarad symbol looks like.


You have to take a bit of time in studying the circuit diagram. 

Microfarad is represented by the abbreviations (MF), or the letter m. It is a type of capacitor with the negative plate being concave and the positive plate being flat. 

OBSERVATION: There are two ways of writing the symbol for a microfarad—one is including the subscript "m" (μF), the other is without the subscript

This is a pet peeve of mine, as it should be obvious that where *m* is present in the unit name, there *must* be a subscript! 

So why do we see people using μF without it? Is it because they've forgotten it's called a micro.

What is Farad?

In short, it deals with the process of storing electric charges within a conductor.

A one-farad capacitor, when charged with one coulomb (1 A·s), has a potential difference of one volt across its terminals. 

Equivalently, a one-farad capacitor stored one coulomb of electric charge produces a potential difference of one volt at its terminals.

In physics, the farad (symbol: F; also called an electrostatic unit or statfarad) is the SI derived unit of capacitance, defined as a capacitor having a capacitance of one farad when charged with one coulomb. 

It is named after the English physicist Michael Faraday, who invented the first capacitor based on earlier discoveries by Italian electrotechnician Luigi Galvani and Brazilian physicist André-Marie Ampère.

History of Farad

The Farad was created to honor Michael Faraday for all of his work with electricity and magnetism. 

Despite its name, the farad is a unit that represents capacitance (the ability to store charge). Originally, the farad was called the “unit of capacity,” but in 1873 it became a unit of capacitance. In 1881 the name “farad” was officially stated to be used for this unit of capacitance.

Who is Michael Faraday?

Michael Faraday is one of the most famous scientists to have ever lived. Although he was not a household name, his discoveries and inventions changed the landscape of science forever.

He discovered or invented virtually every important feature of electricity and electronics. He was one of the four great men of science who laid the foundations for the modern era that began around 1800 (the others were Isaac Newton, Charles Darwin, and James Clerk Maxwell).