ENERGY. WHAT IS ENERGY?. Energy is the capacity of a physical system to perform work. What kinds of energy ARE THERE in NATURE?. Renewable Energy It is any energy resource that is naturally occuring and is replenished and regenerated over a short time scale.
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Energy is the capacity of a physical system to perform work
Non-Renewable Energy: FOSSIL FUELS
Fossil fuels are continually produced by the decay of plant and animal matter, but the rate of their production is extremely slow, very much slower than the rate at which we use them.
Coal is finite so will eventually run out.
Many existing reserves are becoming harder to extract or are environmentally sensitive areas.
Coal releases large amounts of greenhouses gases when burnt
Mining deep underground coal is dangerous
Coal is very expensive to transport around the world
Energy production using coal can be increased or decrease according to demand.
The technology to burn coal to generate electricity already exists
Oil is finite so will eventually run
A lot of oil is located in politically unstable countries or environmentally sensitive areas (Iraq, Libya).
Oil can cause widespread pollution when spilt
Oil releases large amounts of greenhouses gases when burnt
Oil is vulnerable to large scale changes in its price
The production of oil refineries is very expensive.
Energy production using oil can be increased or decrease according to demand.
The technology to burn coal to generate electricity already exists.
Technology is improving to extract deeper. reserves as well oil in tar sands (Canada)
Gas is finite so will eventually run
A lot of oil is located in politically unstable countries or environmentally sensitive areas (Russia).
Oil is vulnerable to leaks and explosions.
Energy production using gas can be increased or decrease according to demand.
The technology to burn gas to generate electricity already exists.
Burning gas releases less greenhouses gases than coal and oil.
It is now possible to compress gas and transport it more easily.
It is the energy that uses the power of the sun to heat water or generate electricity.
It can be captured, converted and distributed by passive or active means for a variety of applications.
Passive solar heating is a simple method by utilizing specific building materials and appropriate building siting (e.g. The South)
It is a clean form of energy.
It is an infinite resource.
Panels can be used locally on the top of houses.
It can be used to heat water and generate electricity.