Computer Science for IGCSE & O level - Hardware (Section 6 - No. 21)
In a central heating system controlled by a microprocessor, what does the system do if the measured temperature is above the set point?
Closes the gas valve.
Opens the gas valve.
Turns off the pump.
Increases the water flow.
Forklaring
The gas valve closes to reduce heat output when the temperature is too high.