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28 Cards in this Set

  • Front
  • Back
Hydroelectricity
Electricity from water.
Oscillation
Vibration or repetitive pattern of movement, for example, up and down or side to side.
Medium
The material through which a wave travels.
Image
A picture of an object formed by light rays.
Optical fibres
A thin glass or plastic strand that can transmit light or infared radiation over long distances. `1`
Pitch
How high or low a note sounds.
Watts
Unit of electricity.
Biofuels
Fuels made using biomass.
Decommissioned
Something that is dismantled safely.
National Grid
Grid of cables that transport electricity around the UK.
Transformer
Someting that changes the voltage of electricity.
Electricity tariff
Amount customers pay for electricity.
Vacuum
A place where there is no matter at all-empty space.
Frequency
Number of cycles passing a point in one second.
Amplitude
Maximum displacement that a point moves away from its position.
Reflected
Something is reflected when it bounces off a surface.
Normal
Perpendicular line crossing a point.
Diffraction
The spreading out of waves when they pass through a gap.
Electromagnetic spectrum
Complete ranfe of electromagnetic waves.
Ionosphere
High and electrically charged layer of the atmosphere.
Echo
Reflection of sound waves.``
Blue shift
The decrese in wavelength when it is approsching something.
Red shift
The increase in wave length when it is moving away from something.
Hypothesis
A suggested explanation.
Conductor
Something which conducts electricity.
Insulator
Something which stops electricity passing through.
Convection
Liquids transfering energy.
Kinetic energy
Energy produced by something moving.