In a basic electrical control system, the device that senses a drop in air temperature is called the:

In a basic electrical control system, the device that senses a drop in air temperature is known as a thermostat. A thermostat detects changes in temperature and provides a method to control heating or cooling systems to maintain a set temperature. It operates by opening or closing a circuit based on the temperature reading it senses, enabling the associated heating or cooling equipment to activate or deactivate as needed.

Thermostats can be mechanical or electronic and are essential for regulating indoor climates in various settings. They ensure that temperature levels remain within a specified range for comfort and efficiency in heating and cooling applications. Understanding how thermostats function is crucial for anyone involved in power engineering and HVAC systems, as they play a key role in energy management and comfort control.