Question

how fuels are classified ? give toe examples.

Answer 1

Answer:

According to the law of conservation of energy, it can neither be created nor be destroyed, it can only be changed from one form to another. Thus, we cannot produce energy to do certain work. Therefore we use certain substances which help us transform one form of energy to another form.

For example, when we burn paper with a matchstick, light is produced by the flame. If we analyse this closely, light energy is not created over there, it has just been produced due to the transformation of heat energy provided by the matchstick into light energy. Thus, we always need a certain substance to convert one form of energy into another for accomplishing various jobs. We call such materials as fuels. In other words, any substance which upon combustion produces a usable amount of energy is known as fuel. Example: fossil fuels, biogas, nuclear energy, etc.

Such materials can furthermore be classified into:

Renewable source of energy: one which is inexhaustible. Example: Solar energy.

Non-renewable source of energy: one which is exhaustible. Example: Fossil Fuels.

Now, the energy produced by burning paper is not sufficient to run cars but energy produced by burning petrol is enough to do so. Thus, we can say that each fuel releases its own set of energy i.e. all of them do not release the same amount of energy upon combustion. The energy produced by combustion of one kg of fuel is known as its calorific value.......

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