The thermopile is connected to a sensitive galvanometer. When the thermopile is pointed at a heat source, there will be a deflection of the galvenometer in one direction with the magnitude dependent on the temperature difference between the heat source and the room. When the thermopile is pointed at a cold source, there will be a deflection of the galvanometer in the opposite direction with the magnitude dependent on the temperature difference between the cold source and the room.




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