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conceptions about energy
TEACHER RESOURCE: Alternative conceptions about energy
Our use of language in everyday life is often quite different to the language of scientists. This
can sometimes be confusing because what scientists mean and what most people mean are
two different things. Scientists need to be very precise so that when they use a word it always
means the same thing. One word that can be a problem is ‘energy’.
When people talk about energy, they often talk about ‘using energy’ or ‘losing energy’.
Students (and adults) can develop the idea that things ‘use up’ energy. They imagine that
something has lots of energy, and then as the object functions, it uses up energy until it runs
out. This is perpetuated by such phrases as ‘we are running out of energy’ when referring to
exercising hard (say, running) or when referring to using up natural energy resources (like oil).
In fact, energy is transformed from one form to another. It is not used up or lost. A
fundamental belief in science is the ‘law of conservation of energy’. This means that energy in
the universe is a constant – it cannot be created nor destroyed. In photosynthesis, solar
energy is transformed into chemical energy. This is a key step in any food chain.
Sometimes, students think food is energy or electricity is the only form of energy. It is actually
the chemical energy in food that enables us to carry out life’s processes. Similarly, it is
electrical energy that, when transformed into heat and light energy, allows a light bulb to
function. Energy is what causes things to happen.
Energy can be found in a number of different forms such as chemical energy, electrical energy,
heat (thermal energy), light (radiant energy), mechanical energy and nuclear energy.
Energy can also be divided into two main types:

Stored energy is called potential energy.

Moving energy is called kinetic energy.
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