Question

the law of conservation of energy says that energy cannot be created or destroyed, so why do we need to conserve energy?

Answer 1

Answer:

The Law of conservation of energy that energy can neither be created nor be destroyed- only converted from one form of energy to another. This means that the system always has same amount of energy unless it is added from outside.By conserving energy we can create a healthy planet.

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Answer 2

Answer:

Law of conservation of energy says that energy neither be created nor destroyed or energy can be transfer from one form to anothet.

So, If we want energy to do any work we get energy by resources.

Suppose u want to drive any car, u wants energy

So, in this case, we take energy from petrol, petrol convert its chemical energy into mechanical energy to move the car. As, u can see petrol transfer its energy to move the vehicle by combustion. After, complete combustion or after giving all energy petrol is finish now. And now if we wants to move car further we want more petrol. That's why we need to conserve energy like petrol.

There are more example like combustion of coal to move the train, using potential energy of water to create electricity etc.