Please enable JavaScript.
Coggle requires JavaScript to display documents.
Energy Resources and Energy Transfer Group 1, (ENERGY RESOURCES AND…
Energy Resources and Energy Transfer Group 1
ENERGY TRANSFERS
SANKEY DIAGRAMS
Energy is not created or destroyed in any process.
(It is just transferred from one store to another.)
SANKEY DIAGRAMS
Sankey diagrams are a simpler and clearer way of showing what happens to an energy input into a system. The energy flow is shown by arrows whose width is proportional to the amount of energy involved. Wide arrows show large energy flows, narrow arrows show small energy flows.
ENERGY TRANSFERS
For energy to be useful, we need to be able to transfer it from one store into whichever store we require. Unfortunately, when we try to do this there is usually some energy transferred to unwanted stores. We often refer to these unwanted stores as ‘wasted’ energy because it is not being used for a useful purpose.
EFFICIENCY
efficiency=（useful energy output/total energy output）×100%
STORES OF ENERGY
Energy is found in many different stores
WORK AND POWER
ENERGY AND WORK
Energy is the ability to do work
When the object is released, it falls – it loses GPE, but gains speed and so gains KE.
KINETIC ENERGY, KE
The kinetic energy of a moving object is calculated using the equation
GRAVITATIONAL POTENTIAL ENERGY (GPE)
The gravitational potential energy of an object that has been raised to a height,
POWER
Power is the rate of transfer of energy or the rate of doing work
THERMAL ENERGY
CONDUCTION
CONVECTION
Convection is the transfer of heat through fluids (liquids and gases) by the upward movement of warmer, less dense regions of fluid.
ENERGY-EFFICIENT HOUSES
To insulate a house effectively we must look at all the ways in which heat energy can escape.
RADIATION
Thermal radiation is the transfer of energy by infrared (IR) waves.
INSULATING PEOPLE AND ANIMALS
This cuts down heat loss by making the surface area of their bodies exposed to the cold as small as possible.
ENERGY RESOURCES AND ELECTRICITY GENERATION
NON-RENEWABLE ENERGY RESOURCES
One of the main energy resources available on our planet is its supply of fossil fuels
RENEWABLE ENERGY RESOURCES
ELECTRICITY
Electricity is not an energy resource, because it has to be generated using other resources of energy
KINETIC ENERGY, KE