Mention the $SI$ unit and value of fundamental charge. Write its smaller units.
Mention the $SI$ unit and value of fundamental charge. Write its smaller units.
Electric charge of electron is called fundamental charge. Its symbol is $e$ and charge is negative.
In the international system ($SI$) of units, a unit of charge is called a coulomb and is denoted by
the symbol $C$.
One coulomb is the charge flowing through a wire in $1 \mathrm{~s}$ if the current is $1$ $A$ (ampere).
In this system, the value of the basic unit of charge is, $e=1.602192 \times 10^{-19} \mathrm{C}$. In general it is taken
as $e=1.6 \times 10^{-19} \mathrm{C}$.
There are about $6.25 \times 10^{18}$ electrons in a charge of $-1 \mathrm{C}$.
In electrostatics, smaller charges are :
$1 \mathrm{mC}$ (milli coulomb) $=10^{-3} \mathrm{C}$
$1 \mu \mathrm{C}$ (micro coulomb) $=10^{-6} \mathrm{C}$
$1 \mathrm{nC}$ (nano coulomb) $=10^{-9} \mathrm{C}$
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