In a current series circuit, which statement is true?

In a series circuit, one of the fundamental principles is that the electric current flowing through each component remains the same. This is because, in a series configuration, there is only one path for the current to travel. Therefore, the current is consistent throughout the circuit.

Furthermore, the voltage across each component can vary depending on the resistance of that component. The total voltage supplied by the power source is divided among the components based on their resistances. As a result, while the current remains constant, the voltage can vary across different parts of the circuit.

This phenomenon aligns perfectly with the statement that current is constant, while the voltage may vary depending on the components in the circuit. Thus, this clearly indicates why the correct choice is that current is constant and voltage is not.