How Does An Electric Kettle Get Hot When It Is Plugged In?- its Heating Elements, Boiling water in 2023

Electric kettles are a common appliance found in many households, especially those who prefer a quick cup of tea or coffee. But have you ever stopped to wonder how an electric kettle actually works? How does it heat up the water so quickly and efficiently?

Instead of utilising a stovetop burner to heat water, an electric kettle plugs into an outlet and uses electricity to operate an integrated heating element. Although not all electric kettles have a separate foundation, they always come with a power base that uses electrical current to transmit heat energy straight into the kettle.

Materials used in the construction of heating elements

The most common materials used to construct heating elements are nichrome (an alloy of nickel and chromium) and stainless steel. Nichrome is preferred due to its high electrical resistance, which makes it efficient in converting electrical energy into heat. 

Stainless steel, on the other hand, is more durable and corrosion-resistant, which makes it ideal for immersion heating elements that come into direct contact with water.

Materials used in the construction of heating elements
Source: Electric Rate

The higher the wattage, the faster the water will heat up. However, higher-wattage heating elements consume more power, which can increase your electricity bills.

Electrical Circuitry

Electric kettles are powered by electricity, which is supplied to the kettle through an electrical circuitry system. This system comprises several components, including a power supply, a control system, and various safety features that ensure the safe operation of the kettle.

The power supply is responsible for converting the household AC (alternating current) voltage into the DC (direct current) voltage required by the kettle. 

This is typically achieved using a transformer and a rectifier circuit. The transformer steps down the AC voltage to a lower level, which is then rectified into DC voltage by a bridge rectifier. The DC voltage is then supplied to the heating element.

Electrical Circuitry
Source: The Pioneer Woman

Safety features built into the circuitry of electric kettles include an automatic shut-off function, boil-dry protection, and a thermal fuse. The automatic shut-off function turns off the kettle automatically when the water reaches boiling point or when the kettle is lifted off its base. 

Also Read: What Are The Benefits Of A Cordless Tea Kettle?

Heating Element

It consists of a coil of wire, typically made of a high-resistance material, which is responsible for generating heat when an electrical current flows through it.

The function of the heating element is to convert electrical energy into heat energy, which is then transferred to the water in the kettle. 

This process is known as Joule heating, named after the British physicist James Prescott Joule, who discovered it in the mid-1800s.

Heating Element of kettle
Source: The New York Times

There are two types of heating elements commonly used in electric kettles:

  1. Immersion heating elements: These are made of a metal tube that is placed directly into the water, and the heating element inside the tube heats the water as the current passes through it.
  2. Surface heating elements: These are flat or spiral-shaped, and they are placed on the bottom or sides of the kettle. The heat generated by the element is transferred to the water through conduction.

Also Read: Can You Put Milk In A Kettle?

Types of heating elements used in electric kettles

The control system of an electric kettle typically comprises a thermostat, a temperature sensor, and a timer. The thermostat regulates the temperature of the water by turning the heating element on and off as required. 

Types of heating elements used in electric kettles
Source: Satsaidrosario

The temperature sensor monitors the temperature of the water and sends signals to the thermostat to activate or deactivate the heating element. The timer, if present, allows the user to set the duration for which the kettle will operate before automatically shutting off.

Also Read: How Can I Fix A Leaking Stainless Kettle?


The thermostat is responsible for regulating the temperature of the water. It is an electronic device that measures the temperature of the water and controls the heating element accordingly.

When the kettle is switched on, the heating element begins to heat the water. The thermostat measures the temperature of the water and compares it to the desired temperature set by the user.

If the temperature is below the desired level, the thermostat activates the heating element to heat the water further. 

Source: Appliances Analysts

Once the desired temperature is reached, the thermostat deactivates the heating element to prevent the water from overheating. The thermostat is typically calibrated to maintain a temperature range of between 85 and 100 degrees Celsius, which is the range at which water boils. 

Some electric kettles may have a variable temperature control that allows the user to set a specific temperature for the water. This is useful for brewing different types of tea or coffee, which require different water temperatures for optimal flavor.

Also Read: Why Does My Breaker Go Off When Using My New Kettle?

Boiling Water

Steam is produced as the water molecules absorb heat energy from the heating element and begin to move faster and faster. Eventually, the water molecules have enough energy to escape the surface of the water and become steam.

The steam produced by the boiling water is released from the kettle through a spout or steam vent. The spout is designed to direct the steam away from the user and prevent it from causing burns or other injuries. 

Some electric kettles may also have a steam release button or lever that allows the user to control the amount of steam released from the kettle.

Boiling Water
Source: Daily Express

When boiling water in an electric kettle, it is important to take certain safety precautions to prevent injuries or accidents. 

Here are a few things to keep in mind:

  1. Always use the kettle on a stable, flat surface to prevent it from tipping over.
  2. Make sure the kettle is filled with the correct amount of water before switching it on. Overfilling the kettle can cause the water to spill out and potentially cause burns or electrical hazards.
  3. Never touch the kettle or the water inside it while it is boiling or immediately after it has boiled. The water and the kettle will be very hot and can cause burns.
  4. Use the spout or steam vent to release steam from the kettle, and avoid inhaling steam directly from the kettle as it can cause burns to the respiratory system.
  5. If the kettle overheats or begins to emit smoke, immediately switch it off and unplug it from the power source.

By following these safety precautions, you can safely and effectively use an electric kettle to boil water for your tea, coffee, or other hot beverages.

Is it safe if a plug gets hot?

An overheated electrical outlet may burn and melt the outer casing as well as the casing surrounding the interior wiring, emitting an unappealing noxious odour. But if they become too hot, they may also start electrical fires or even give people electric shocks. In a nutshell, it may be quite dangerous.

Also Read: Why Does The Kettle Go Quiet Just Before It Boils?

Can leaving a kettle plugged cause a fire?

Any gadget that generates heat should be unplugged when not in use. These devices risk overheating and even fire if left plugged in. Kettles, toasters, space heaters, and curling irons are a few appliances to disconnect. Use fewer extension cords.

Should a plug get hot when in use?

This is a red flag for a malfunctioning electrical system. Therefore, if you discover that your electrical outlet is hot to the touch, please get in touch with us right away. We’ll send a certified electrician to fix your outlets and circuits, conduct a safety inspection, and assess the issue.

Also Read: What Are Dots On The Bottom Of My Tea Kettle?

Can I leave water in my electric kettle overnight?

It is not recommended to leave water in an electric kettle overnight as it can promote the growth of bacteria and cause a buildup of mineral deposits. It is best to empty the kettle after each use and clean it regularly.

Electric kettles have become an indispensable appliance in many households, especially for those who enjoy a hot cup of tea or coffee. But have you ever wondered how an electric kettle gets hot when you plug it in?

Understanding how electric kettles work can not only satisfy your curiosity but also help you make informed decisions when purchasing and using them.

An electric kettle gets hot when it is plugged in due to the heating element that is present inside it. The heating element converts electrical energy into heat energy, which in turn heats the water present in the kettle.

Do I need to unplug electric kettle?

After each use, promptly unplug this kettle. Unplug the appliance and let it cool before cleaning to avoid shock and burn risks.

Avoid using any appliance with a broken cord or plug, after it has malfunctioned, or if it has been dropped or otherwise damaged in order to reduce the risk of injury.

Also Read: What Happens If You Boil A Kettle With Too Little Water?

Do electric kettles use electricity when plugged in?

Even when they are not turned on, the majority of modern kettle types drain power from the electronic circuit. Even if the amount of electricity used now is far less than when it is turned on, over time it will result in an increase in your monthly bill.

How long does it take for an electric kettle to boil water?

The time it takes for an electric kettle to boil water depends on the wattage of the heating element and the amount of water being heated. Generally, it takes between 2 to 5 minutes for an electric kettle to boil a full pot of water.

Also Read: Is There A Minimum Amount Of Water In A Kettle?

Can I boil milk or other liquids in an electric kettle?

It is not recommended to boil milk or other liquids in an electric kettle as it can cause the liquid to froth and spill over, potentially causing a mess or injury. Electric kettles are designed to boil water only.


In conclusion, an electric kettle uses a combination of electrical circuitry, heating elements, thermostats, and safety features to heat water to boiling point and produce steam. 

The electrical circuitry controls the power supply and temperature of the heating element, while the thermostat ensures that the water is heated to the correct temperature and prevents it from overheating. 

The heating element is typically made of metal alloys that can withstand high temperatures and is designed to heat the water quickly and efficiently. When the water reaches boiling point, it produces steam, which is released from the kettle through a spout or steam vent. 

Safety features such as automatic shut-off switches, boil-dry protection, and safety handles are built into electric kettles to prevent injuries and accidents.

By understanding how an electric kettle works and taking the necessary safety precautions, users can enjoy hot water for a variety of purposes safely and efficiently.

Click And Collect More information: Kettle


Why does my electric kettle plug get hot?

The metal contacts in the socket that connect to the plug pins may get a little bit loose over time. Heat is produced by the frayed link.

Are electric kettles more energy-efficient than stove-top kettles?

Yes, electric kettles are generally more energy-efficient than stove-top kettles because they heat water faster and more efficiently. Electric kettles are also designed to turn off automatically once the water reaches boiling point, which reduces energy consumption.

Can I clean my electric kettle?

Yes, electric kettles can be cleaned by filling the kettle with a mixture of water and vinegar or lemon juice and boiling it. After boiling, allow the mixture to cool for 30 minutes, then rinse the kettle thoroughly with clean water.

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