Charge must always be conserved. It cannot be created or destroyed and the amount of charge after an interaction must always equal the amount of charge before an interaction.
Kirchoff’s first law states that for any point in an electrical circuit the sum of currents into hat point always equals the sum of currents out of that point.
Charge is the product of current and time. This law means that charge cannot be created or destroyed therefore the amount of charge carriers entering a point always equates to the amount of charge carriers leaving that point.
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