Conservation of energy TRIPLE

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Equation for gravitational potential energy
ΔGPE = mgΔh
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Equation for kinetic energy
KE = ½mv²
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Explain the idea of conservation of energy
Energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.
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Describe the effects of the thickness and thermal conductivity of the walls of a building on its rate of cooling.
The higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material.
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Equation for efficiency
(useful energy output / energy input) * 100
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Sankey Diagrams
The thicker the line or arrow, the greater the amount of energy involved.
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Transfer diagrams
In transfer diagrams the boxes show the energy stores and the arrows show the energy transfers.
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Explain how energy is dissipated so that it is transferred into less useful forms.
E.g. in a light bulb some energy is transferred as heat energy. It is eventually transferred to the surroundings, making them warmer. This ‘wasted’ energy eventually becomes so spread out that it becomes very difficult to do anything useful with it.
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Solar energy
Uses collector panels to harvest energy of sun to create conditions that can be turned into power. Lots of sun energy available, but only some locations have enough direct power for long enough to generate enough usable power.
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Wind energy
Wind turbines take wind as power to turn, turbine then turns generator to produce electricity. Unforseen ecological impacts may not make this an ideal way to get energy.
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Geothermal energy
Energy produced beneath the Earth. Clean, sustainable, environmentally friendly. Can only be produced at certain sites in the world.
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Hydrogen energy
Available with water and is most common element on Earth. Completely renewable, doesn't leave toxic emissions in atmosphere.
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Tidal energy.
Converts kinetic energy of tides into electrical energy. Renewable and produces lots of energy even when tides at low speed, though huge investment and limited availability of sites.
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Wave Energy
Produced from waves in ocean. Renewable, no harm to atmosphere, but can damage marine ecosystem and is source of disturbance and can be source of visual and noise pollution.
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Hydroelectric energy
Provided by dams. Many dams are aging and need major restoration which costs a lot.
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Biomass energy
Produced from organic material and is commonly used throughout the world. Chlorophyll present in leaves captures suns energy. When plants are burned water and carbon dioxide is again released into atmosphere. Used for heating and cooking.
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Nuclear power
Energy is created through a nuclear reaction, which is then used to power generators. But not necessarily safe.
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Fossil fuels
Non-renewable. To get fossil fuels out there has to be a heavy destruction and pollution of environment. Provide power for most of the world, primarily using coal and oil.
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Other cards in this set

Card 2

Front

Equation for kinetic energy

Back

KE = ½mv²

Card 3

Front

Explain the idea of conservation of energy

Back

Preview of the front of card 3

Card 4

Front

Describe the effects of the thickness and thermal conductivity of the walls of a building on its rate of cooling.

Back

Preview of the front of card 4

Card 5

Front

Equation for efficiency

Back

Preview of the front of card 5
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