# Farad unit in SI system

Farad is the SI unit of capacitance of a capacitor. It is symbolized by the letter F. If a capacitor can store 1-coulomb charge due to the application of 1-volt potential difference across it, then the capacitance of the capacitor is called 1 Farad.

$\color{Blue} 1 F = \frac{1C}{1V}$………………….

## What does it mean by 1 micro-Farad capacitance?

The capacitance of a capacitor is said to be 1 microfarad if it is capable of storing 1 microcoulomb amount of electric charge in presence of 1 volt amount of voltage across it.

The Farad unit is related to all other metric units of capacitance. The four most useful conversion relations are given below.

• $\color{Blue} 1 mF = 10^{-3} F$
• $\color{Blue} 1 \mu F = 10^{-6} F$
• $\color{Blue} 1 nF = 10^{-9} F$
• $\color{Blue} 1 pF = 10^{-12} F$

$\color{Blue} 1 F = 9*10^{11} StatF$.

For Example: 5 Farads = 5 * 9 * 1011 StatF = 45 * 1011 StatFarads

## Unsolved numerical problems

Test yourself by solving the following four questions.

Do you know that Earth is a Capacitor? Yes, Earth has a capacitance of 711 $\small \mu F$ and in Farad unit it is 711*10-6 F. Here is how to calculate the capacitance of Earth.