Computer Science for IGCSE & O level - Hardware (Section 5 - No. 22)
In a central heating system, which action will the microprocessor take if the temperature is below the pre-set point?
It will close the gas valve.
It will turn the pump off.
It will open the gas valve.
It will ignore the reading.
คำอธิบาย
The gas valve will open to increase the heat.