Introduction to Energy

Subject: Science

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Overview

Energy is the capacity of doing work. Whenever an object is capable of doing work. We are capable to do any kind of work only if we have some energy. This note has short introduction on energy and its types.
Introduction to Energy

Energy is the capacity of doing work. Whenever an object is capable of doing work, we understand it has some energy. We are capable of doing any kind of work only if we have some energy. In the same way, a machine can also perform any work if it has some energy.

A simple machine such as lever, pulley, inclined plane etc. uses our muscular energy to do work. However, if the machine is complicated they need some sources of energy such as coal, petroleum, electricity, etc.

All present sources of energy such as coal, diesel, petrol, hydroelectricity, solar energy, tidal energy, nuclear energy, geothermal energy are classified into primary energy sources and secondary energy sources.

Sources of energy:

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Primary energy sources:

The sources of energy, which are used directly from nature, is known as primary sources of energy.

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Secondary energy sources:

The sources of energy, which are derived from primary sources, are called secondary sources.

Based on replacing period, the sources of energy are classified as:

  1. Non-renewable source of energy
    The sources of energy that is stored in nature from several million years and cannot be replaced if it is used once are called the non-renewable source of energy. Some examples are coal, petroleum, natural gas, nuclear energy, etc.
  2. Renewable source of energy
    The sources of energy, which can never be exhausted and can be replaced quickly if it is used once is called the renewable source of energy. For example Hydropower or hydroelectricity, wind energy, solar energy, tidal energy, geothermal energy, etc.
Things to remember
  • Energy is the capacity of doing work. Whenever an object is capable of doing work, we understand it has some energy. We are capable to do any kind of work only if we have some energy. In same way, machine can also perform any work if it has some energy.
  • Simple machine such as liver, pulley, inclined plane etc. uses our muscular energy to do work. However, if the machine is complicated they need some sources of energy such as coal, petroleum, electricity, etc.
  • The sources of energy, which are used directly from the nature, is known as primary sources of energy.
  • The sources of energy, which are derived from primary sources, are called secondary sources.
  • The sources of energy, which can never be exhausted and can be replaced quickly if it is used once is called renewable source of energy.
  • It includes every relationship which established among the people.
  • There can be more than one community in a society. Community smaller than society.
  • It is a network of social relationships which cannot see or touched.
  • common interests and common objectives are not necessary for society.
Videos for Introduction to Energy
Energy: Forms and Changes
Introduction to work and energy
Work and Energy (part 2)
Questions and Answers
The natural sources that are used in their primary form i.e. without any conversion are called primary sources of energy. For example wood, coal, natural gases etc.
Renewable source Non-renewable source
They are somewhat found abundantly. They are found in limited quantity.
They can be replenished within a human life. They take millions of years to form.
They are continuously formed in nature They are not produced continuously by nature.
Those resources that can be reused after it is used once are called renewable resources.
Coal is nonrenewable source of energy because it cannot be used more than once. Once used its existance is lost from this world. So it cannot be replaced.

The sources of energy, which are not produced continuously in nature and are exhaustible are called non-renewable sources of energy. Example: coal, petrol,etc.


The four renewable source of energy are:

  1. Solar energy
  2. Wind energy
  3. Hydro energy
  4. Bio-gas energy
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