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TYPES OF ENERGY - examples explained
(h) Light energy
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 Light
energy (parts of the electromagnetic spectrum, like visible light, microwaves and infrared
etc.)
-
Strictly speaking light is NOT an energy
store, but an important form of energy.
-
Light is an example of
electromagnetic radiation and the energy is carried by particles with
wave-like properties called photons.
-
All luminous
sources by definition give out visible light eg the sun, light bulb, candle, fire
etc.
-
When light
impacts on any material, the energy is absorbed eg sunlight shining on plant
leaves in photosynthesis, light falling on the retina of our eyes.
-
You cannot store light energy because
ultimately it is always absorbed by materials it impact on and converted
into another type of energy e.g. heat.
-
Note that invisible infrared radiation is
converted directly into heat when absorbed by a surface eg warmth feeling in sunlight, standing by a
fire, a toaster.
-
Solar cells can convert light energy
directly into electrical energy which can be used as it is produced or
stored in a rechargeable battery system.
-
See
Electromagnetic radiation,
types, properties and uses
-
Introduction to heat transfer - conduction
(and thermal conductivity),
convection and radiation gcse physics
Energy resources,
energy
transfers, work done and
electrical power supply revision notes index
Types of energy & stores - examples compared/explained, calculations of
mechanical work done and power
Chemical
energy stores *
Elastic
potential energy stores, calculations *
Electrical
& electrostatic
energy stores
Gravitational potential
energy and calculations *
Kinetic
energy stores
and calculations *
Nuclear
energy store
Thermal
energy stores *
Light energy *
Sound energy *
Magnetic
energy stores
Conservation of energy,
energy transfers-conversions, efficiency - calculations and
Sankey diagrams gcse physics
See also
More on methods of reducing heat transfer eg in a house, insulating properties of materials
Energy resources: uses, general survey & trends,
comparing renewables, non-renewables, generating electricity
Renewable energy (1) Wind power and
solar power, advantages and disadvantages gcse physics revision
notes
Renewable energy (2) Hydroelectric power and
geothermal power,
advantages and disadvantages
gcse physics
Renewable energy (3) Wave power and tidal barrage power,
advantages and disadvantages
gcse physics
See also
Renewable energy - biomass - biofuels & alternative fuels,
hydrogen, biogas, biodiesel gcse chemistry notes
Greenhouse
effect, global warming, climate change,
carbon footprint from fossil fuel burning gcse chemistry
The absorption and emission of radiation by
materials - temperature & surface factors including global warming
The Usefulness of Electricity gcse
physics electricity revision notes
and
The 'National Grid' power supply, mention of small
scale supplies, transformers gcse
physics notes
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