How does the amperage behave in a series circuit with multiple devices?

In a series circuit, the amperage remains constant throughout the entire circuit. This is a fundamental principle of series circuits: the same amount of current flows through each component. This occurs because there is a single path for the current to flow, so the total current entering the series circuit is equal to the current exiting it, regardless of the number of devices connected in the circuit.

The behavior of the amperage in a series circuit contrasts with how voltage behaves, which can vary across the different devices based on their resistance. However, since the current remains uniform in a series circuit, regardless of how many devices — like resistors, lights, or alarm sensors — are included in the circuit, the overall amperage is consistent.

This principle is important for understanding how to design and troubleshoot electrical systems, particularly in alarm systems where consistent current flow is necessary for reliable operation.