Water in an electric kettle becomes hot due to

Question

Question

Answer 1

CONCEPT:

SR.NO	Conduction	Convection	Radiation
1.	In conduction, heat transfer takes place between objects by direct contact.	In convection, the heat transfer takes within the fluid.	In radiation, heat transfer occurs through electromagnetic waves without involving particles.
2.	The heat transfer takes place due to the difference in temperature.	The heat transfer occurs due to the difference in density.	The heat transfer occurs in all objects with a temperature greater than 0 K.
3.	The heat transfer in conduction is slow	The heat transfer in convection is faster.	The heat transfer in radiation is the fastest.
4.	The heat transfer occurs through a heated solid object.	The heat transfer occurs through intermediate objects. For example, heat transfer between air and water.	The heat transfer occurs through electromagnetic waves.
5.	It does not follow the law of reflection and refraction.	It does not follow the law of reflection and refraction.	It follows the law of reflection and refraction.

Heat transfer in fluids generally takes place via convection.
Convection currents are set up in the fluid because the hotter part of the fluid is not as dense as the cooler part.
So there is an upward buoyant force on the hotter fluid, making it rise while the cooler, denser fluid sinks.

EXPLANATION:

From the above discussion, it's clear that there is a difference between conduction, convection, and radiation.
Heat transfer in fluids generally takes place via convection.
So the water in the kettle becomes hot by convection.

The correct option is 2.