Question

What is coulomb ?

Answer 1

Hint: The coulomb is the international system of units (SI units) of electric charge. Under the 2019 redefinition of the SI units, the coulomb is exactly \[\dfrac{1}{{1.602\;176\;634 \times {{10}^{ - 19}}}}\] elementary charge. The same number of electrons has the same magnitude but opposite sign of charge, that is, a charge of -1 coulomb.

Complete step by step answer:
Coulomb is the S.I unit of the charge .
One coulomb means the amount of charge transferred by a current of one ampere in one second.
The name coulomb is named after Charles Augustin de Coulomb, a French physicist, who served as an army engineer in Martinique before he returned to France. He is best known for his proposal of “inverse square law” to describe the interaction between magnets in 1785, which he proved experimentally using a torsion balance.
By 1873, the british association for the advancement of science had defined the volt, ohm and farad but not the coulomb.
In 1881, the international electrical congress, now known as international electrotechnical commission (IEC), approved the volt as the unit of electromotive force, the ampere as the unit of current, and the coulomb as the unit of electric charge.
At the time of 1881, the volt was defined as the potential difference across the conductor when a current of one ampere dissipates one watt of electric power.
The coulomb was part of the EMU system of units. The entire set of reproducible units was abandoned in 1948 and the international coulomb became the modern day coulomb.

Note: The charges in static electricity from rubbing materials together are typically a few microcoulombs.
The amount of charge that travels through a lightning thunderbolt is typically 15 C, although for large thunderbolts it could be up to 350 C.