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Infra red is
another name for thermal radiation
A dark surface
will absorb radiation better than a
light surface
Metals are good conductors because
they have free electrons
Hot Air rises because
it is less dense than cold air
A radiator has a large surface area
so that it can lose heat easily
Chemical Energy is
the type of energy stored in fuel and
food
Energy is measured in units of
Joules (j)
Kinetic energy
is the energy of moving object
Power =
Insulators are materials
Energy transferred
Time taken
that do not conduct heat or
electricity very well
The National Grid
is a network of cables and
transformers
A Generator is
a device for turning kinetic energy
into electrical energy
Gravitational energy is
the energy of an object due to its
position
Energy cannot
be created or destroyed
Useful energy
is energy transferred to where it is
wanted in the form it is wanted
are turned by water running
downhill
Hydroelectricity generators
Step up transformers
step up power stations’ voltage to
grid voltage
Geothermal energy
comes from the energy released by
radioactive rocks deep inside the
Earth
The efficiency of a device =
Useful energy transferred by the
device
Total energy supplied to the device
Electrical energy is
energy transferred by an electric
current
Convection only takes place
in liquids and gases
Energy
Power of device x Time in use
transferred =
230 volts is the voltage of
mains electricity that we use in the
home
Burning fossil fuels
releases greenhouse gases
Heat loss from a building can be
stopped by
insulating the walls, fitting double
glazing and insulating the loft
Wasted energy is the
energy that is not usefully
transferred or transformed
The unit of power is
The watt (W)
A step down transformer
steps the voltage down so that it can
be used in our homes
Uranium is
a radioactive metal that can be used
in power stations
A tidal power station
traps water each high tide and uses
it to turn generators