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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http://www.sonic.net/~lilith/EnviraFuels/images/secondary-energy.jpg

Primary energy sources:

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

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.

  • 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.
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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  • Which one of the following is the factor that doesnot affect the pressure exerted by a liquid?

    Value of acceleration due to gravity


    Depth or height of the liquid column


    volume of the liquid


    Density of the liquid


  • The capacity of doing work is ______.

    power


    work


    pressure


    energy


  • Which form of energy does the flowing water possess?

    potential energy
    kinetic energy
    mechanical energy
    sound energy
  • The type of energy possessed by a simple pendulum, when it is at the mean position is ______.

    sound energy


    kinetic energy


    potential energy


    mechanical energy


  • Which is not renewable source of energy?

    sun
    coal
    wind
    water
  • Which one is limited source of energy?

    geothermal
    mon
    wind
    coal
  • Which of the following is not a bio-mass source?

    nuclear energy
    coal
    gover gas
    wool
  • Which of the following causes the least pollution when burnt?

    wool
    nuclear energy
    coal
    natural gas
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Aakash

Define protium and deuterium

saapana

write the evidences for thermonuclear fusion reaction on sun?

Ashim pokhrel

what termonuclear fusion reaction?

supriya

1.what do you mean by e=mc2?