Which of the following is used as the heating unit of an electric kettle?

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 3

Answer 1

Electric kettles are powered by the heating element.
The heating element is a concealed wire in the metal tube, which resists the flow of electricity.
When electricity flows into the heating element, it is turned into heat, which heats the water inside the kettle.
The heating element is controlled by the thermostat. The thermostat consists of a variable resistor.
Higher the set temperature, lower the resistance.
A small current runs through the thermostat, usually controlled by electronic switch known as the transistor.
The transistor controls the heating element. When the resistance goes up in the thermostat, less current flows through, which causes less current to flow through the heating element.
This keeps the heating element and the water inside the electric kettle cooler.
When the resistance is reduced, the current through the thermostat increases, which causes the transistor to increase the current through the heating element. This raises the temperature of the water.