When two sirens are wired in series, what happens to the voltage?

When two sirens are wired in series, the total resistance in the circuit increases, which can lead to a drop in voltage across each individual siren. This is due to the principle of voltage division, where the total voltage from the power source is divided among the devices (siren units) in the series.

In a series circuit, the same current flows through each component, but the voltage is shared based on the resistance of each component. Generally, if both sirens have the same resistance, the total voltage is divided equally between them. As a result, the voltage that each siren receives is less than the total voltage provided by the power source, leading to a drop when comparing it to a setup where only one siren is used.

This principle illustrates the importance of understanding how components interact in a series configuration, as it can significantly affect the performance of devices like alarm sirens in a security system.