EnergyEnergy

What is EnergyWhat is Energy• The energy is defined as the capacity to The energy is defined as the capacity to

perform any work. perform any work.

• When we walk or run or doing any work When we walk or run or doing any work then after some time we feel tired, this is then after some time we feel tired, this is because of loss of because of loss of energyenergy of our body. of our body.

• This is the physical property which This is the physical property which follows the law of conservation.follows the law of conservation.

Types of EnergyTypes of Energy• Thermal energyThermal energy

• Electrical energyElectrical energy

• light energylight energy

• Sound energySound energy

• Mechanical energyMechanical energy

• Chemical energyChemical energy

• Nuclear energyNuclear energy

1. Thermal Energy1. Thermal Energy

- Heat is a form of - Heat is a form of energy. energy.

- When an object is - When an object is heated, it means energy heated, it means energy is added and when an is added and when an object gives out heat object gives out heat (like radiation), the (like radiation), the object gives out energy. object gives out energy.

- The type of energy - The type of energy involved here is the involved here is the ‘‘Thermal energyThermal energy’.’.

2. Electrical energy 2. Electrical energy

• ““Electrical energy" refers to Electrical energy" refers to energy which has been energy which has been converted from electrical converted from electrical potential energy. potential energy.

• This energy is supplied by This energy is supplied by the combination of the combination of electric currentelectric current and and electrical potentialelectrical potential that is that is delivered by the circuit. delivered by the circuit.

• At the point that this At the point that this electrical potential energy electrical potential energy has been converted to has been converted to another type of energy, it another type of energy, it ceases to be electrical ceases to be electrical potential energy. potential energy.

3. light energy 3. light energy • It can also be defined as the It can also be defined as the

electromagnetic radiation of electromagnetic radiation of visible light.visible light.

• Since light itself is energy, then Since light itself is energy, then another definition is relevant: another definition is relevant: light is nature’s way of light is nature’s way of transferring energy through transferring energy through space.space.

• The speed of light is about The speed of light is about 300,000 km/s. 300,000 km/s.

4. Sound 4. Sound energyenergy • Sound is the movement of Sound is the movement of

energy through substances in energy through substances in longitudinal longitudinal (compression/rarefaction) waves. (compression/rarefaction) waves.

• Sound is produced when a force Sound is produced when a force causes an object or substance to causes an object or substance to vibrate — the energy is vibrate — the energy is transferred through the transferred through the substance in a wave. substance in a wave.

• We can hear a noise from an We can hear a noise from an object when it gives out an object when it gives out an

energy which makes us hearenergy which makes us hear. .

Sound energy wave

5. Mechanical 5. Mechanical energyenergy • mechanical energy is the mechanical energy is the

sum of potential energy and sum of potential energy and kinetic energy. kinetic energy.

• It is the energy associated It is the energy associated with the motion and position with the motion and position of an object. of an object.

• Mechanical energy of isolated Mechanical energy of isolated system that is only subject to system that is only subject to conservative forces the conservative forces the mechanical energy is mechanical energy is constant. constant.

6. Chemical 6. Chemical energyenergy• Energy released and Energy released and

absorbed during absorbed during chemical reaction.chemical reaction.

• When water is poured When water is poured on an acid then heat on an acid then heat evolves, it means heat evolves, it means heat released which is released which is mainly due to mainly due to chemical reaction chemical reaction occurred between occurred between water and acid.water and acid.

7. Nuclear 7. Nuclear energyenergy - Energy released - Energy released

during nuclear fission during nuclear fission and fusion reaction is and fusion reaction is

called nuclear called nuclear energy.energy.

- The concept of the - The concept of the

nuclear power plant nuclear power plant is based on this is based on this principal.principal.

Renewable Renewable energies energies • There are many There are many

energies like - solar energies like - solar energy, wind energy, wind energy, geothermal energy, geothermal energy, etc. Since energy, etc. Since these energies are these energies are replenished again replenished again and again, these and again, these are called are called ““Renewable Renewable energies”energies”. .

Potential EnergyPotential Energy• The energy acquired by it The energy acquired by it

by the virtue of its position by the virtue of its position and an energy which is and an energy which is readily available for use.readily available for use.

• Potential energy is broadly Potential energy is broadly classified into two types : -classified into two types : -

1. Mechanical Potential 1. Mechanical Potential

EnergyEnergy

2.Electrical Potential Energy 2.Electrical Potential Energy

Kinetic EnergyKinetic Energy• It is defined to be It is defined to be

an energy by virtue an energy by virtue of its motion of an of its motion of an object. object.

• The kinetic energy The kinetic energy of an object is of an object is given by K.E – given by K.E – m v*v / 2m v*v / 2

Hydro Hydro EnergyEnergy• Moving water is Moving water is

highly energized. This highly energized. This

can be used to rotate can be used to rotate

the turbine to the turbine to produced electricity.produced electricity.

• Turbine contains a Turbine contains a number of blades at number of blades at the periphery. the periphery.

Wind PowerWind Power

• Wind with high Wind with high speed speed

is also a source of is also a source of energy to rotate the energy to rotate the turbine.turbine.

• Wind power plant is Wind power plant is

based on this based on this concept.concept.

Solar powerSolar power• Solar light or sun heat Solar light or sun heat

is used as the energy is used as the energy

source by the use of source by the use of

photovoltaic.photovoltaic.

• It is important type of It is important type of renewable energy renewable energy which is used at a which is used at a large scale now-a-large scale now-a-days.days.

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A Power Point Presentation ByA Power Point Presentation By

Yogendra Singh ShekhawatYogendra Singh Shekhawat

B. Tech, Mechanical B. Tech, Mechanical EngineeringEngineering