science6º

2.  Eneregy causes the changes we see
around us. There are many types of energy
such as:
 Mechanical Chemical Heat (thermal)
Electrical Light Nuclear
energy

3. Renewable: sources of energy that do not run
out.
Non-renewable: sources of energy that run out
as the are used up.
Sources of
energy

4.  Energy can be transferred: it can pass from one
object to another. EX: a moving tennis racket has
mechanical energy.
 Energy can be stored: batteries EX: they store
energy
Properties of
energy

5.  Energy can be transported: it can pass from one
place to another. Electrical energy. EX: is transported
through cables
 Energy can be transformed: from one type to
another.
Chemical energy in petrol EX: is transformed into
mechanical energy

6.  Heat: heat causes changes. Therefore, heat is a
form of energy.
 Temperature. temperature is an objective
comparative measurement of hot or cold. It is
measured by a thermometer.
Heat and
temperature

7.  Heat conductors: are materials that transmit heat
quickly.
 Heat insulators:transmit heat very slowly.
Transmission of
heat

8.  Electricity conductors: are materials that transmit
electricity.
 Electricity insulators: they don’t conduct electricity.
Transmission of
electricity

9.  Expansion is the increase in size of an object when
the temperature is raised.
Expansion of an
object

10.  Energy is transformed from one to another type, in
this case electricity is transformed into light but some
of the energy is transformed into heat.
Heat and the
transformation of
energy

11.  Power plants: most power plants produce electrical
current with a generator or dynamo. A generator or
dynamo is a machine with magnets and coils of
conductive wire inside.
Producing
electricity

12.  Hydroelectric: use the mechanical energy of falling
water to turn a turbine.
 Eolic or wind power plants: use the mechanical
energy of the wind.
 Thermal : use the chemical energy stored in a
combustible fuel.
Types of
power plants

13.  Nuclear power plant: use the heat generated when
radioactive elements produce a chain reaction.
 Solar thermal power plants: use the heat of the sun
to boil the water and create steam.
 Solar photovoltaic: do not use turbines or
generators.

14. Transportation of electrical energy
 The energy produced in power plants cannot be
stored. In the city centre, power lines normally lie
underground until they enter a building.