Zusammenfassung der Ressource
PHYSICS
- ENERGY
TRANSFER
- Conduction occurs in all 3 states
- melting/evapouration/ condensation are 3
changes of state
- evapouration = particles gain energy, rise, become
less dense and break free and evapourate into gasses
- vacuums and insulators prevent conduction
- Convection occurs in liquids
and gasses
- vacuums and silver surfaces
prevent conduction
- Radiation doesn't need particles to
pass through
- silvered surfaces prevent radiation
- ENERGY TRANSFER: Energy (joules) =
Power (watts) x Time(seconds)
- GENERATING ELECTRICITY
- NON-RENEWABLE: nuclear, coal, oil and gas.
- RENEWABLE: wind, tidal and wave,
hydroelectric, boifuels and geothermal
- NATIONAL GRID: power station -> step up
transformer -> power lines -> step down transformer,
houses
- carbon capture = storing CO2 in
natural containers (sea) to reduce
global warming
- ELECTROMAGNETIC
SPECTRUM
- Transverse = oscillations areperpendicular to
direction of energy transfer
- longitudinal =
oscillations are parallel
- wave equation: V = F x
- waves can be reflected,
refracted and diffracted
- REFLECTION
- incident ray = reflected ray
- humans can hear 20hz - 20,000hz
- the higher the frequency of a wave,
the higher the pitch
- RED
SHIFT/DOPPLER
EFFECT
- red shift = when a light source moves away, the
wavelength increases + frequency decreases so red
tint is shown
- doppler = when a sound source moves away or closer the
frequency increases or decreases meaning a higher or
lower pitch
- gamma and x-rays can travel through solids
and are dangerous if exposed for long
periods of time
- ENERGY EFFICIENCY
- Efficiency = useful energy out/total
energy in X 100
- energy CANNOT be destroyed only transferred
- pay back time = total cost/yearly saving gives you
the answer in years
- total cost = No. of kilowatt hours x cost per
kilowatt hour