Yes.
No, boiling water in a kettle on a stove is an example of conduction - the heat from the stove directly transfers to the kettle, heating the water inside.
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The energy used when boiling a kettle typically comes from electricity in the form of heat. The heat is transferred from the heating element in the kettle to the water, raising its temperature until it reaches the boiling point.
In a whistling kettle on a gas stove, energy transfer occurs primarily through thermal conduction and convection. The gas flame heats the kettle's bottom, transferring thermal energy to the water inside. As the water heats up and reaches its boiling point, it converts to steam, creating pressure that forces air through the whistle, producing sound energy in the form of a whistle. Thus, energy is transferred from chemical energy in the gas to thermal energy in the water and then to sound energy in the whistle.
The useful energy in a kettle is the thermal energy that heats up the water inside the kettle, allowing it to reach the desired temperature for preparing beverages or food. This energy is essential for the kettle to fulfill its purpose of boiling water efficiently.
A boiling kettle is useful for preparing hot water for drinks or cooking. However, leaving a kettle boiling for an extended period would waste energy unnecessarily. It is best to boil only as much water as needed to be energy-efficient.
Compared to leaving the kettle on and hot all the time, it certainly saves electrical energy if the kettle is turned off when it's not in use. The switch can be used to perform that vital function.
In a kettle, electrical energy is transferred to thermal energy as the heating element inside the kettle generates heat. This heat then transfers to the water, increasing its temperature and causing it to boil.
The energy used to boil water in a kettle is primarily thermal energy, which is the heat transferred to the water from the heating element in the kettle. This causes the water molecules to gain kinetic energy and eventually reach the boiling point, turning into steam.
Boiling water out of a kettle can be used for boiling noodles for soup or spaghetti.
The evaporation of water by boiling is the transfer of thermal energy (radiation or convection) to the molecules which form water vapor. The energy is the same, but it changes from kinetic to potential energy. As the water vapor gives up heat by conduction in the air, the water again condenses (dew, rain, ice, snow).
Boiling a kettle typically releases around 0.15 kg (150 grams) of CO2 into the atmosphere each time, mostly from the energy it consumes during the boiling process.