What are the three types of smoke detectors?

The three types of smoke detectors include photoelectric, ionization chamber, and combination detectors.

Photoelectric smoke detectors utilize a light source and a light-sensitive sensor. When smoke enters the detection chamber, it scatters the light beam and triggers the alarm. These detectors are particularly effective at sensing smoldering fires that produce a lot of smoke without flames.

Ionization chamber detectors work by using a small amount of radioactive material, which ionizes the air within the chamber, allowing a current to flow. When smoke enters the chamber, it disrupts this current, setting off the alarm. These detectors are highly sensitive to flaming fires that produce little smoke and may not be detected as quickly by photoelectric devices.

Combination smoke detectors incorporate both photoelectric and ionization technologies, providing a broad range of protection by being able to detect both smoldering and flaming fires efficiently. This versatility makes them a preferred choice in many homes and public buildings.

The other options do not accurately represent the three main types of smoke detectors. They might suggest different technologies or features but do not align with the standardized categories recognized in fire safety and prevention.