778813
Descrição
Mapa Mental por Hannah Fowkes, atualizado more than 1 year ago
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Criado por Hannah Fowkes
mais de 11 anos atrás
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P1 OCR
- Heat and Temperature
- Energy is transferred from a
hotter to a colder body.
- Temperature is a measure of HOTNESS on an
arbitrary scale, measured in DEGREES CENTIGRADE.
- Energy is a measure of ENERGY TRANSFER on
an absolute scale, measures in JOULES.
- Energy is transferred when a substance
changes temperature.
- The amount of energy transferred depends on the mass and the specific latent heat.
- Energy transferred = mass x specific latent heat
- Energy transferred = mass x specific latent heat
- The amount of energy transferred depends on the mass and the specific latent heat.
- The amount of energy transferred depends on
the mass, temperature change and specific
heat capacity.
- energy transferred = mass x
specific heat capacity x
temperature change
- energy transferred = mass x
specific heat capacity x
temperature change
- Energy is transferred from a
hotter to a colder body.
- Energy Transfer
- Air is a good insulator and reduces energy transfer by conduction
- Conduction in a solid is by the
transfer of kinetic energy
- Conduction in a solid is by the
transfer of kinetic energy
- Trapped air reduces energy transfer by convection
- Convection currents are caused by changes in density
- Convection currents are caused by changes in density
- Energy saving in the home can be
achieved by:
- Double glazing
- Cavity wall insulation
- Draught excluders
- Reflecting foil
- Loft insulation
- Curtains
- Careful design
- Double glazing
- Shiny surfaces reflect infrared radiation to reduce energy transfer
- Energy transformations can
be represented by diagrams
- Efficiency = useful
energy output
(x100%) / total
energy input
- Air is a good insulator and reduces energy transfer by conduction
- Waves Transfer Energy
- Warm and hot objects emit infrared radiation
- Infrared radiation is used for cooking
- Microwaves can be used for cooking and communication
when transmitter and receiver are in line of sight
- Laser light is single colour
and in phase
- Laser light, visible light and
infrared are all used to send
signals along optical fibres
by total internal reflection
- Digital and analogue signals are used
for communication
- Morse is a digital code
- Digital signals allow many signals to
be transmitted at the same time
- Digital signals are clearer
- Morse is a digital code
- Radio waves are used for communication
- Longer wavelengths diffract around obsticles
- Longer wavelengths diffract around obsticles
- Radio waves, microwaves, infrared, visible light and ultraviolet
are some of the waves in the electromagnetic spectrum
- The energy of the wave increases as the wavelength decreases
- All electromagnetic waves can
be reflected, refracted and
diffracted
- All waves have amplitude, frequency and wavelength:
wave speed = frequency x wavelength
- The energy of the wave increases as the wavelength decreases
- Warm and hot objects emit infrared radiation
- The Stable Earth
- Earthquakes can travel through the earth
- Different waves help us to find out about the inside of the earth
- Exposure to ultraviolet radiation causes sun burn and skin cancer
- Sunscreen and sunblock reduces damage caused by ultraviolet radiation
- CFCs are causing the ozone layer
to become thinner
- Earthquakes can travel through the earth
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