The temperature sensor in an electronic thermometer is a thermocouple consisting of two wires of different metals. The two ends of the wires are connected together, and the other two ends are connected to an electric current meter. When the connected ends of the wires are heated, the thermocouple becomes a source of electric current, the current is proportional to the temperature difference between the connected and disconnected ends of the thermocouple. Electric current from the thermocouple enters the input of the electronic device. converting this signal into digital readings on the liquid crystal display.
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