What are the two types of smoke alarms?

The correct response identifies the two main types of smoke alarms: photoelectric and ionization.

Photoelectric smoke alarms utilize a light sensor to detect smoke. In this type of alarm, the presence of smoke particles interferes with a light beam, triggering the alarm. This type is particularly effective for detecting smoldering fires that produce a lot of smoke before bursting into flames. They are known for their sensitivity to slow-burning fires, such as those caused by upholstered furniture or mattresses.

Ionization smoke alarms, on the other hand, contain a small amount of radioactive material that ionizes the air within a sensing chamber. When smoke enters this chamber, it disrupts the ionization process, causing a drop in current flow and activating the alarm. These alarms are more responsive to flaming fires, like those caused by paper or flammable liquids.

Understanding the functionality of both types of smoke alarms is crucial in fire safety, as it informs individuals on which type of smoke detector may be more appropriate for their particular environment or potential fire risks.