Electric charge is the fundamental property of particles such as electrons and protons. Electric charge can neither be created nor destroyed. That means, if there is an electron or a proton then there is a charge.
Electrons have a negative charge and protons have a positive charge. Protons are much heavier than electrons. However, the charge of a proton is equal to the charge of an electron.
We know that if two opposite charges are placed close to each other they get attracted. On the other hand, if two same or like charges are placed close to each other they get repelled.
When a proton is placed closer to an electron, they get attracted. On the other hand, when two protons or two electrons are placed close to each other, they get repelled.
Electric charge is measured in coulombs (C). One coulomb is the amount of charge transferred by a current of 1 ampere in 1 second. For example, if 4 coulombs (C) of charge passes in 2 seconds, the current = 4 ÷ 2 = 2 amperes (A).