Question

short notes on lesson sources of energy​

Answer 1

Answer:

The largest source of energy on land is sunlight. There are different purposes for which energy is needed such as for food, for lightning, transport, running machines etc.

A good source of energy should be-

Cheap and easily available.

Safe in handling and use.

Do not cause any environment pollution.

Easy to store and transport.

Fuels

Materials that are burnt and used to store energy are defined as fuels. For Example, Wood, Coal etc.

Features of Good Fuel-

It should have high calorific value.

It should not produce smoke while burning.

Cheap and easily available.

Easy to handle and safe to transport.

Convenient in storage.

Sources of Energy

There are two types of Sources of Energy - Conventional Sources of Energy and Non-conventional Sources of Energy. Conventional sources of energy include the fossil fuels such as coal and petroleum. Non-conventional sources include solar cooker, solar cell panel etc.

Conventional Sources of Energy

Fossil Fuels

These fuels are developed from fossils.

They are present in limited amount.

They are non-renewable sources of energy.

These fuels cause pollution. They release different oxides which causes acid rain which damages plants, animals, houses etc. Excessive release of carbon-dioxide also causes global warming.

Pollution by the fossil fuels can be controlled by increasing the efficiency of combustion process and using other techniques to escape the harmful gases.

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Answer 2

The energy we use to power everything from our homes to schools and workplaces comes from a variety of different sources. These can be broken down into renewable and non-renewable energy sources.

A renewable energy source is any natural resources that can replace itself quickly and dependably. A non-renewable energy source is a source with a finite supply (in other words, it’ll eventually run out).

Renewable resources of energy:-

Renewable energy sources are plentiful, sustainable and kind to the environment. And the great thing is, they’ll never run out!

Wind Energy:-

Energy in moving air, harnessed by wind turbines

Used to produce electricity

Thermal Energy

Solar Energy:-

Energy that comes from the sun

Converted into heat, light and electricity

Chemical Energy:-

Biomass:-

Energy contained in organic matter

Used to generate electricity

Nuclear energy:-

Hydropower:-

Energy in the force of moving water

Captured by dams in hydropower plants and converted to electricity

Electrical Energy:-

Geothermal Energy:-

Energy that comes from heat generated by the Earth

Used to produce electricity, and can provide heat and hot water

Non- renewable resources of energy:-

Non-renewable energy comes from sources that have a limited supply. Most non-renewable energy sources are fossil fuels, which are generally bad news for the environment.

Wind Energy:-

Coal:-

Comes from the remains of plants that died hundreds of millions of years ago

Has the highest level of carbon of all fossil fuels

Thermal Energy:-

Oil:-

Comes from the remains of plants that died hundreds of millions of years ago

Can be extracted and refined to make gasoline, diesel and jet fuel

Chemical Energy:-

Natural Gas:-

Formed from the remains of tiny sea plants and animals that died millions of years ago

Mainly composed of methane

Nuclear energy:-

Energy released when atoms’ nuclei are fused together (fusion) or split apart (fission)

Nuclear power plants produce electricity through nuclear fission

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