P1
- Created by: csmethurst
- Created on: 23-03-16 17:36
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- P1
- ORIGIN OF THE UNIVERSE
- Big Bang
- expansion of the universe
- only explains expansion, not cause of expansion
- says the universe should be slowing down expansion now not speeding up as it is
- cosmogony - björk
- Big Bang
- ELECTROMAGNETIC SPECTRUM
- radio waves
- microwaves
- infrared radiation
- visible light
- ultraviolet
- x-rays
- gamma rays
- electromagnetic spectrum song
- WAVES PROPERTIES
- reflection
- angle of incidence = angle of reflection
- refraction
- the speed of the wave changes its direction by changing the density it goes through
- diffraction
- waves spreading out, the amount it spreads depends on the narrowness of the gap
- wavelength
- amplitude
- frequency
- reflection
- ELECTRICITY AND THE NATIONAL GRID
- distributed by the national grid
- pylons & transformers
- step up transformer - increase voltage
- step down transformer - decrease voltage to not overload building's circuits
- ENERGY SOURCES
- renewable
- wind
- wave
- tides
- hydroelectric
- solar
- geothermal
- biofuel
- non-renewable
- bad for the environment, will eventually run out, provide most energy
- fossil fuels
- coal, oil, natural gas
- nuclear
- renewable
- COST OF ELECTRICITY
- numberof units used = power x time
- cost = numberof units x price per unit
- energy = power x time
- EFFICIENCY OF MACHINES
- efficiency = useful energy out / total energy in
- efficiency = useful power out / total power in
- SPECIFIC HEAT CAPCITY
- energy transferred = mass x specific heat capacity x temperature change
- how much energy it can store
- RATE OF HEAT TRANSFER
- surface area
- larger = more heat transfer
- temperature
- same temperature but smaller volume = cooler quicker
- material
- good condctor = more heat transfer
- surface area
- ENERGY EFFICIENCY IN THE HOME
- cavity wall insulation
- loft insulation
- draught proofing
- hot water tank jacket
- thick curtains
- payback time = how long it takes for the cost to be made back with savings
- U Values = how fast heat transfers
- higher U value = more heat transfer
- you want lower U values
- higher U value = more heat transfer
- CONDENSATION AND EVAPORATION
- evaporation = liquid to a gas
- if they're travelling in the right direction and fast enough
- makes the liquid cool
- condensation = gas into a liquid
- particles slowing down, losing kinetic energy
- moisture's in the air
- Untitled
- evaporation = liquid to a gas
- CONDUCTION AND CONVECTION
- where energy is transferred
- conduction = colliding particles making more heat
- convention = moving from the hot part to the cold part in a liquid
- summary
- ORIGIN OF THE UNIVERSE
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