Page 107 - Science - 5

Unit-IV : Man and Machines

12 Forms and Sources of Energy

l Energy
l Forms of energy
l Chemical Energy, Muscular Energy, Mechanical Energy, Wind Chemical Energy, Muscular Energy, Mechanical Energy, Wind
Inside l Chemical Energy, Muscular Energy, Mechanical Energy, Wind
Inside
the Energy, Electrical Energy, Water Energy, Heat Energy, Solar
the
Chapter
Chapter
Energy, Sound Energy, Atomic Energy
l Sources of energy
l Conservation of energy

ENERGY
The capacity to do any work is called

energy. Energy is consumed whenever any
work is done. We need energy for doing
different works. Without energy, we can’t
do any work. Machines get energy from the
fuel they consume or use some other forms
of energy for doing work. Trucks and buses
use diesel. Steam engines and thermal

power stations use coal. Electrical
appliances use electricity to do work. We
too need energy to do work. Our body gets
energy from food.

Do you know that all machines work using
some form of energy?

FORMS OF ENERGY
Energy is found in various forms :

Chemical Energy Energy Energy
Chemical
Chemical
Chemical energy is a form of potential energy

and it is possessed by things such as food, fuels
and batteries. Food stored inside the body is a
form of chemical energy. In humans, chemical

energy is changed into muscular energy to do
work.

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