Question

if energy can neither be created nor destroyed explain with an example why we should worry about our energy resources?

Answer 1

You told that energy can neither be created nor be destroyed...Yeah ! It is true but another thing which should not be neglected is that energy can be transformed from one form to another. And the energy which has been transformed cannot be revert back to the actual energy.

For example---> The plants absorb light energy from the sun and convert it into chemical energy for their food. Now the chemical energy cannot be again re-convert into light energy.

Also when we burn coal or petroleum ,what actually happens is that The heat energy applied on coal ( chemical energy ) converts it into another form of energy and that form of energy cannot be re-converted into the previous coal and petroleum.

That is why, we should save / manage our natural resources.

Stay curious ...^_^

Answer 2

Energy comes in different forms and one form can be converted into another form. For example-it we light a candle, the process is highly exothermic so that the chemical energy in the candle changes into light energy on burning. The total energy during a physical and chemical process remains the same but we cannot again put together the heat and light generated alongwith the products of the reaction to get back the chemical energy in the form of wax. Hence, energy, in the usable form, is dissipated to the suroundings in less usable forms. So the sources of enrgywe use to do work is consumed and cannot be used again.