Please enable JavaScript.
Coggle requires JavaScript to display documents.
Energy Transfers and Resources - Coggle Diagram
Energy Transfers and Resources
Types of Energy
Kinetic
Sound
Electrical
Light
Thermal
Chemical
Nuclear
Gravitational Potential
Elastic Potential
Energy Transfers
System-a single or group of objects
Closed system-where neither matter or energy can enter or leave the system
In every system energy is dissipated into less useful stores
Thermal insulation : slows the rate of energy transfer using insulators
Lubricant- reduces friction between the object's surface when it moves
Efficiency- the amount of energy that is transferred to the useful store
Efficiency= useful output energy transfer ÷ total energy transfer
Energy can be transferred in four main ways
Mechanically- an object moving due to a force being exerted on it
Electrically-a current moving through a potential difference
Heating- energy transferred from a hotter object to a colder object
Radiation- energy transferred by waves eg. light and sound
Work done is the same as energy ransferred. Work can be done by a moving charge or a force moving an object through a displacement
Conservation of energy : energy can be transferred usefully, stored or dissipated, but can never be created or destroyed
Power- the rate of work done
Power =energy ÷ time
Specific Heat Capacity - the amount of energy needed to increase the temperature of one kilogram of a substance by one°C
energy= change in temperature × specific heat capacity× change in temperature
Energy Resources
Non-renewable
Nuclear
Most reliable energy source
Very expensive and radioactive waste
Fossil fuels
Carbin emissions
Very reliable
Renewable- can be replenished as it is used
Wind
Waves
Tides
Solar
Bio-fuel
Hydroelectricity
Geothermal
Uses
Transport(coal and oil)
Heating(coal,oil,gas)