Question

Explain the concept of Energy.

Answer 1

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In physics, energy is the quantitative propertythat must be transferred to an object in order to perform work on, or to heat, the object.[note 1] Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton.
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Answer 2

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When a car runs, the engine of the car generates a force which displaces the car.

In other words, work is done by the car. This work done is on the expense of fuel. Fuel provides the energy needed to run the car. Had the petrol tank been empty car could not be run.

The conclusion is that, if there is no source of energy, no work will be done.

Anything which is capable of doing work has energy.

For example, the steam pushes up the lid placed on the boiling water container. It means, the steam has the ability or capacity to do work. The work done by the steam on the lid is equal to the energy of the steam.

Definition of Energy :: The capacity of doing work by the body or an object is known as the energy of the body or the object.

■ Energy is a scaler quantity.

■ SI unit of energy is Joule (J).

■ C.G.S of energy is erg.

1 J ( Nm ) = ${10}^{7}$ erg ( dyne cm )

Note* : The unit of work done and energy is same. This is because these two physical quantities are interconvertible. Force acts as a mediator in this conversion.

Some other units of energy :-

○ 1 eV = 1.6 × ${10}^{-19}$J ; 1 KJ = 1000J

○ 1 Cal = 4.168 J

○ 1 kWH = 3.6 × ${10}^{6}$ J

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