What are the two major pieces of a basic electric control circuit?

In a basic electric control circuit, the two major pieces are the sensor switch and the final control element. The sensor switch is responsible for detecting changes in the environment or the system it operates within, such as temperature, pressure, or other critical parameters. When the sensor switch detects a specified condition, it sends a signal to the control system.

The final control element is the actuator or device that carries out the control action, typically responding to the signal from the sensor switch. This could include devices like valves, motors, or any other mechanical systems that adjust to maintain the desired system state. Together, the sensor switch and final control element enable the circuit to perform its intended function, maintaining control and system regulation.