What type of material is used in a kidde system to change resistance with temperature?

The material used in a Kidde system to change resistance with temperature is ceramic. Ceramics are made from inorganic, non-metallic materials and are known for their impressive thermal stability and high resistance characteristics. In the context of temperature detection and fire safety systems like Kidde, ceramic materials can effectively respond to heat changes, allowing for accurate and reliable performance as they change resistance based on temperature fluctuations. This property is crucial for the sensitivity and effectiveness of the monitoring systems that rely on thermal detection, such as smoke and heat detectors.

In contrast, while plastic might have some applications due to flexibility, its thermal-related properties do not offer the necessary sensitivity and stability required in safety applications. Silicone is also more associated with its flexibility and durability in high temperatures rather than its effectiveness as a resistive element for temperature changes. Metals can conduct electricity well and have some use in temperature sensors; however, they typically do not provide the same level of precision in resistance changes due to temperature as ceramics do in specialized applications like those found in Kidde systems.