Which of the following defines the use of a thermostat in an electric kettle?

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  1. It is used to compare the ambient temperature with the temperature inside the kettle.
  2. It is used to maintain the temperature inside the kettle.
  3. It is used to stop the flow of electricity through the heating element once the appropriate temperature is reached.
  4. It Is used to reduce the temperature in case of overheating of the heating element.

Answer (Detailed Solution Below)

Option 3 : It is used to stop the flow of electricity through the heating element once the appropriate temperature is reached.
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Detailed Solution

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The correct answer is option 3.

Thermostat

  • A thermostat is a regulating device component that senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint. 
  • The thermostat in an electric kettle senses the temperature of the water and then cuts off the power supply to the heating element once the desired temperature is reached.
  • Thermostats use different types of sensors to measure temperatures and actuate control operations.
  • Mechanical thermostats commonly use bimetallic strips, converting a temperature change into mechanical displacement, to actuate control of the heating or cooling sources.
  • Electronic thermostats use a thermistor or other semiconductor sensor, processing temperature changes as electronic signals, to control the heating or cooling equipment.
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