Autmun Topic Test Flashcards
What is a system
Group of objects
When a system changes the way the energy is stored
Changes
Energy can be transferred usefully, stored or dissipated,
Bu cannot be created or destroyed
Work done is measured in
J joules
Force is measured in
N newtons
Distance os measured in
M metres
1 joule =
1 newton metre
Work done against a frictional force causes
A temp rise of the object
Gravitational potential energy
Ep in joules
Mass is measured
In kg
Gravitational field strength
G is in newtons per kg
Height
In metres
Kinetic enrgy
Ek in joules
Ways of reducing unwanted energy transfers
Double glazed windows to stop thermal enrgy transferring ,lubrication to reduce friction and therefore heat energy transfer
Ways to increase the efficiency of an intended energy transfer
Reduce the amount of enrgy transferred to thermal so heat that is unwanted again by lubrication or insulation
1 joule per second is
1 watt
Power
P in watts W
Energy transferred
E in joules J
Time
T in seconds S
Work done
W in joules
Two motors lift the same weight to the same height but one does it quicker
Rate if change of energy so in this case the transfer if enrergy is work done to kinetic . So as one is more powerful it makes one rate of change quicker than the other
Main enrgy sources on earth
fossil fuels (coal, oil and gas), nuclear fuel, bio-fuel, wind, hydroelectricity, geothermal, the tides, the Sun and water waves
Renewable energy source
One that is being replenished as it is being used
Uses of energy resources :
Transport, electricity generation,and heating
Difference between renewable and non renewable energy sources
Non renewable means theres a limited amount of it so a finite resource and renewable means it gets replenished as it gets produced
Environmental issues from hydro electricity
Damns force many wildlife to relocate and die
Environmental issues from nuclear
Nuclear leakage and radiation can kill lots of wildlife and mutate them
Fossil fuels affect on environment
Produce loads of co2 lowering the air quality resulting in animals dying from air pollution
Fossil fuels are used for
transport, electricity generation and heating
Bio fuel
transport, electricity generation and heating
Nuclear
Electricity generation
Wind
Electricity generation
Hydroelectricity
Electricity generation
Geothermal
Electricity generation and heating
Tides
Electricity generation
Sun
Electricity generation. Solar panels take up lots of spaces possibly forcing people out of living spaces and animals to make room
Water waves
Electricity generation
Energy patterns and trends the Main energies used
Oil, gas and coal all fossil fuels as fossil fuels are simple to turn into enrgy and there are lots of them however they also have a higher power out out than most other energies
Lowe used energies in tha pattern
Hydroelectricity and nuclear make up 10 percent due to the fact that hydroelectricity has a lower power output and nuclear takes longer and is more complicated to produce enrgy
Wats hydroelectricity used for in the trends
To fill in gaps in the power grid as its very easy to make very quickly
Energy def
The potential to do work
