What is typically used in the circuitry for smoke detectors?

Smoke detectors are designed to operate effectively in various environments and provide reliable alerts in the event of smoke or fire. Typically, smoke detectors are powered by both battery power and AC voltage, which allows them to function in different scenarios.

The use of battery power ensures that the smoke detector remains operational even during power outages. This is crucial for safety, as a smoke detector that relies solely on AC voltage would cease to function if the electrical supply is interrupted. By incorporating both battery and AC power sources, the smokes detectors can maintain continuous operation at all times.

Additionally, using AC voltage allows for potentially more powerful operation, making the unit more reliable overall. This dual power source approach also aligns with safety standards, which often require that smoke detectors have a battery backup to ensure performance at all times. Thus, this combination of power sources enhances the reliability and effectiveness of smoke detectors in ensuring safety in residential and commercial buildings.