Energy Resources and Energy Transfer Group 1

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ENERGY TRANSFERS

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WORK AND POWER

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ENERGY RESOURCES AND ELECTRICITY GENERATION

SANKEY DIAGRAMS

SANKEY DIAGRAMS

ENERGY TRANSFERS

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KINETIC ENERGY, KE

EFFICIENCY

STORES OF ENERGY

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Energy is found in many different stores

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efficiency=(useful energy output/total energy output)×100%

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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.

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 is not created or destroyed in any process.
(It is just transferred from one store to another.)

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THERMAL ENERGY

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CONDUCTION

CONVECTION

ENERGY-EFFICIENT HOUSES

RADIATION


INSULATING PEOPLE AND ANIMALS

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Convection is the transfer of heat through fluids (liquids and gases) by the upward movement of warmer, less dense regions of fluid.

Thermal radiation is the transfer of energy by infrared (IR) waves.

To insulate a house effectively we must look at all the ways in which heat energy can escape.

This cuts down heat loss by making the surface area of their bodies exposed to the cold as small as possible.

ENERGY AND WORK

When the object is released, it falls – it loses GPE, but gains speed and so gains KE.

KINETIC ENERGY, KE

GRAVITATIONAL POTENTIAL ENERGY (GPE)

POWER

Energy is the ability to do work

The gravitational potential energy of an object that has been raised to a height,

The kinetic energy of a moving object is calculated using the equation

Power is the rate of transfer of energy or the rate of doing work

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NON-RENEWABLE ENERGY RESOURCES

RENEWABLE ENERGY RESOURCES

ELECTRICITY

One of the main energy resources available on our planet is its supply of fossil fuels

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Electricity is not an energy resource, because it has to be generated using other resources of energy