The physical system of temperature control in the room (in winter is shown in the figure below. by temperature level The room temperature measured by the sensor in the form of an electrical voltage level is compared with the temperature level. The room temperature set from Potentiometer The temperature difference is the pressure difference. the voltage obtained from the sensor and Potentiometer It is processed by a controller and a control signal is sent to the gas solenoid vale that is used to control the flow rate of the gas fed to the burner so that gas fire is fed to the heat exchanger in the room. Desired Temperature Potentio- meter Measured Temperature Controller Control Signal Gas Solenoid Valve Gas Flow-rate Write a block diagram of a control system. Gas Fire Insulation Actual Room Temperature Heat Input Thermometer Outside Temperature Heat Loss