Answer:

Refrigerator

Explanation:

An example of a house-hold appliance whose circuit is connected in series is the refrigerator. The compressor and the thermostat of the refrigerator are connected in series in such a way that when the temperature inside of the refrigerator is high, the thermostat switches the compressor on so as to reduce the temperature inside the refrigerator to a desired level. The series connection of a typical refrigerator is illustrated in the diagram attached.