Energy is the ability to do work.Now -a- days without energy nobody can exist.Sun is the main source of energy.The other sources of energy are petrol,coal,nuclear energy,wind energy etc.so we should save energy for our future generations.
Energy is the ability to do work.Now -a- days without energy nobody can exist.Sun is the main source of energy.The other sources of energy are petrol,coal,nuclear energy,wind energy etc.so we should save energy for our future generations.