Question

any simple idea about science working model

Answer 1

there r many ideas....
hydroelictrucity
working solar energy
solar system
rain water harvesting.....
its eVen nice..if u use ur own creativity for making something
hope it helps☺☺

Answer 2

here is ur ans.

1) Biogas

2) solar irrigation system

3) water purifier

4) mobile control home electrical things

5) smart city with solar