The concept of conservation of charge is a fundamental principle in physics that states that the total amount of electric charge in a closed system remains constant over time. This principle is based on the observation that charges are neither created nor destroyed, but can only be transferred from one object to another. In other words, the net charge of an isolated system is always conserved.

To understand the conservation of charge, let's consider the example of an electric circuit. When a current flows through a circuit, electrons are transferred from one point to another. However, the total amount of charge in the circuit remains the same, as the transferred electrons balance each other out. This means that the total charge entering an electrical device must be equal to the total charge leaving it.

In an isolated system where no external charges are involved, the conservation of charge holds true. This means that if an object gains a certain amount of positive charge, another object in the system must simultaneously gain an equal amount of negative charge to maintain overall charge balance.