If the temperature is above 20 degrees Celsius, the central heating is switched off. If the temperature is below 20 degrees Celsius, the central heating is switched on. Which logic gate applies? Input A = The temperature if above 20 degrees. Output Y = The central heating is turned on.

Input A is true when the temperature is above 20°C. In that case, the heating is off, so output Y is false. When the temperature is below 20°C, A is false and the heating is on, so Y is true. The output is the opposite of the input, which is a NOT gate.

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