Man
in the ancient time was dependent wholly on the energy of their muscles.
Afterwards,
they learnt to tame the wild animals and use their energy in different work.
They
used to carry their goods and cultivate land with the help of animals. The initial
stage
of civilization was to produce heat energy from burning wood and leaves and
mechanical
energy from current of water and flow of wind. The economic development
of
human being begins from the use of machine energy. Industrial revolution and
invention
of steam engine reduced men’s dependence on muscle energy of human and
animals.
Man kept operating different machines with the help of steam energy Man in the
ancient time was dependent wholly on the energy of their muscles.
Afterwards,
they learnt to tame the wild animals and use their energy in different work.
They
used to carry their goods and cultivate land with the help of animals. The
initial
stage
of civilization was to produce heat energy from burning wood and leaves and
mechanical
energy from current of water and flow of wind. The economic development
of
human being begins from the use of machine energy. Industrial revolution and
invention
of steam engine reduced men’s dependence on muscle energy of human and
animals.
Man kept operating different machines with the help of steam energy necessary
to produce this steam energy. So we consider different kinds of fuels to be the
sources
of energy.
The
most common sources of energy are coal, mineral oil and natural gas. Coal,
mineral
oil
and natural gas from underground are used as fuel directly or by refining them
slightly.
