Inside a material are millions of atoms. These atoms have several electrons revolving around the nucleus and none of these electrons are at rest. Under certain conditions, it is possible to get these electrons to flow across the material in a guided manner.
https://www.88tuition.com/libr....ary/effects-of-elect

Physically, sound is nothing but energy in the form of vibrations traveling through a medium like a liquid, solid, or gas.
https://www.88tuition.com/libr....ary/unit-of-sound-ty

A thermodynamic system is a body of matter that is confined by boundaries within a specific space. These systems can be categorized into closed, open, and isolated systems based on the type of boundaries that confine them.
https://www.88tuition.com/libr....ary/latent-heat-of-w

To move an object or stop a moving object, some sort of effort is required in real life. This effort is generally provided in the form of a force whose effect may or may not be visible to the naked eye. As a result of the application of such a force, an object can get displaced by a certain amount and this displacement is the phenomenon of work.
https://www.88tuition.com/library/work-and-energy

Everything in this universe is made up of very tiny entities known as molecules. Based on the distance between these molecules, the matter is classified into solids, liquids and gasses and these different states of matter have different properties. Common examples include temperature, density, pressure, etc.
https://www.88tuition.com/library/transfer-of-heat