Final answer:
A thermostat is the device designed to automatically activate the alarm when the room temperature increases rapidly.
Step-by-step explanation:
The device designed to automatically activate the alarm when the room temperature increases at a rapid rate of 12-15 degrees Fahrenheit (F) per minute is called a thermostat. A thermostat is a device used to control the heating and cooling systems in buildings. When the temperature rises rapidly, the thermostat detects the change and triggers the alarm to alert the occupants of the room.
Thermostats work based on a temperature sensor called a thermistor. The thermistor's resistance changes with temperature, allowing the thermostat to measure and monitor the room temperature. If the temperature increases at a rapid rate, it means there may be a malfunction in the heating system or another potential issue, which is why the alarm is activated.
Thermostats are widely used in homes, offices, and other buildings to maintain a comfortable and safe temperature.