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- Energy from the Sun.
- Kinetic energy from
moving air turns the blades
on a wind turbine to
produce electricity.
- Some gases in the Earth's atmosphere
trap heat from the Sun increasing global
warming.Scientists disagree about how
much effect humans have on the increase
in levels of these Greenhouse gases.
- Passive solar heating
uses glass to help keep
buildings warm.
- Photocells do not need fuel or
cables,need little maintenance and
cause no pollution.
- Kinetic energy from
moving air turns the blades
on a wind turbine to
produce electricity.
- Electricity generation.
- Power = Voltage x Current.
- In power stations fuels release energy as heat.Water
is heated to produce steam.The steam drives
turbines.Turbines turn generators.Generators produce
electricity. Efficiency = Output \ Total energy input x
100%.
- Energy = Power x Time.
- Nuclear fuels are
radioactive.The radiation
produced can cause
cancer.Waste products
remain radioactive for a
long time.
- The main forms of ionising
radiation are alpha,beta and
gamma.Their uses depend on their
penetrative and ionisation
properties.
- The main forms of ionising
radiation are alpha,beta and
gamma.Their uses depend on their
penetrative and ionisation
properties.
- Nuclear fuels are
radioactive.The radiation
produced can cause
cancer.Waste products
remain radioactive for a
long time.
- A dynamo produces
electricity when coils of
wire rotate inside a
magnetic field.The size of
the current depends on
the number of turns,the
strength of the field and
the speed of rotation.
- Transformers change
the size of the
voltage and
current.The National
Grid transmits
electricity around the
country at high
voltage and low
current.This reduces
energy loss.
- Power = Voltage x Current.
- Our Solar System.
- Planets,asteroids and
comets orbit the Sun in
our Solar System.
- When two planets
collide,a new planet and
a moon may be formed.
- Medium-sized stars,such as our
Sun,were formed from nebulae and
will eventually become red
giants,white dwarfs and finally black
dwarfs.
- Planets,asteroids and
comets orbit the Sun in
our Solar System.
- The Universe.
- Scientists believe that the
Universe started with a Big
Bang.
- The Universe is explored by
telescopes on Earth and in
space.Large distances mean that it
takes a long time for information to
be received and makes inter-galactic
travel unlikely.
- The Universe consists of many
galaxies.Models of the Universe
have changed over time and
sometimes these changes take a
long time to be accepted.
- Most asteroids are between Mars and
Jupiter but some pass closer to
Earth.They are constantly being
monitored.An asteroid strike could cause
climate change and species extinction.
- Scientists believe that the
Universe started with a Big
Bang.
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