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Summary Energy and Energy Resources

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Energy and Energy Resources summary document. Includes: Formulae for different energy transfers Formulae for power, efficiency, work done and energy Sources of Energy e.g. hydroelectric Different power stations e.g. conventional power plants

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Energy Sources
● A reliable energy source can produce energy, whenever it is needed. It does not depend on external factors, and
can be constantly available or predictably available.

● A new renewable energy source is a source of energy. That won't run out. This may be because it does not rely on
a few or can be replenished at no cost.

● When there is an unexpected change in the demand for power energy sources with low response times are able to
quickly respond to those changes.

Wind energy

● Wind turbines consists of a number of components, such as blades, a shaft, a generator and a tower. The blades
catch the wind, when the shaft, which is attached to the blades rotates them. The generator transforms the kinetic
energy produced from the rotations into electrical energy

Tidal energy

● Tidal power generates energy by capturing the energy, which is contained in the moving water mass due to tides.
That energy can be produced by two types of tidal energy, kinetic energy of the currents, or the potential energy
produced by the difference in height between the high and low tides.
● Tidal power is considered as a renewable energy source sits tight are caused by orbital mechanical of the solar
system, and are considered inexhaustible within a human timeframe. The root source of the energy comes from
the slow deceleration of the Earth's type rotation, resulting in the moon gaining energy from this interaction, as
slowly receding from the Earth.
● Tidal power has great potential for future power and electricity generation, because of the total amount of energy
contained in this rotation paddle power is reliably predictable, because structions of these power stations are
expensive, and they work best in high tides, which cannot be guaranteed. Therefore, there are few tidal power
stations in the world.

Hydroelectric power

● Hydroelectric power works when fast flowing water is released from dams in mountainous areas, turn the water
turbines to produce the electricity. This method does not cause pollution but does cause problems to fish breeding
loss of wildlife habitat and changes in water flow of rivers.
● When large dams are built the flow of the dammed river is radically changed and large areas of land are flooded,
including wildlife habitats and farming land hydroelectric power supplies 20% of the world's electricity was
providing almost all of Norway's electricity. It produces 83% of Ireland's requirements. 67% of Austria's
electricity and 70% of Canada's electricity. As of now, Canada is the world's largest producer of hydroelectric
power.


Solar
● Solar energy is produced by solar photovoltaic cells, or by solar panels, solar cells, which are primarily made of
silicon convert the light given off by the sun into electricity silicon is a semiconductor material, and the cells job
is to absorb sunlight.
● The solar energy frees the electrons from their atoms, allowing them to move through the silicon this occurrence
is known as the photovoltaic effect. When the free electrons, each carrying a negative charge flows towards the

, front surface of the cell results in an imbalance of charge. This creates a difference in voltage potential, like
battery, like a battery.
● And then the two surfaces are connected to an external load, allowing electricity to flow solar panels contains
pipes that heats up from the sun, and can provide hot water for a home, or even boiling the water to produce
steam, which in turn generates electricity from spinning a turbine to thermal energy

Oil

● Oil is a fossil fuel extracted from under the sea bed and it is a major contributor to global warming due to the
carbon dioxide released when it is burned. Oil reserves are expected to run out in the next 50 years.
● Oil is no longer used for electricity generation in the UK, but we still consume a large amount of it for other uses
each year. In fact 36% of the UK's total energy consumption was from oil in 2017. Over half of the oil consumed
in the UK is in the form of petrol and diesel for cars. Another 20% is used for jet fuel.
● Between 1980 and 2004, a surplus in trade led to oil contributing more than £90 billion to the UK. However, in
2005, the UK became a net importer of oil with a deficit of £2.7 billion. Since then, the cumulative deficit
amounts to just under £87 billion.

Geothermal energy

● Geothermal energy produces energy from the energy released by radioactive substances deep within the earth,
which heats up the surrounding rocks.
● The radioactive decay in the mantle produces heat, which heats up the cold water that was injected into the
ground. The hot water is pumped up and transformed into steam, spinning the turbines and producing electricity.

Wave power

● Wave power is produced from energy in ocean waves which occur due to the motion of wind over the sea. There
is a transfer of energy, ultimately from the sun to the sea via the wind and so wind power is considered as a
short-term solar-energy storage.
● It is a non-polluting and renewable source of energy since it can be replaced rapidly by certain natural processes,
in this case, involves the power generate from the wind.
● Because wave power is easily derived from natural processes, it is a flexible source of affordable energy. Wave
power devices absorb this energy to generate electricity and can be floating, fixed to the sea bed offshore, or
constructed at the sea’s edge on a suitable shoreline.
● Since waves are irregular in direction, durability and size, it is not easy to harness the energy so these power
stations are rare.

Biofuel

● A biofuel is any fuel produced from living or recently living organisms, such as animal waste or plants. Biofuels
can be used instead of fossil fuels in modified engines for transport and in power stations.

Natural Gas

● Natural gas is a naturally occurring, non-renewable hydrocarbon gas mixture consisting primarily of methane. It
is formed when layers of decomposing plant and animal matter are exposed to intense heat and pressure under the
surface of the Earth over millions of years.
● The energy that the plants originally obtained from the sun is stored in the form of chemical bonds in the gas.
Natural gas is the least damaging to the environment of all of the fossil fuels.
● The UK currently imports over 60% of its natural gas from other countries. And that figure is going up as the
North Sea depletes to 100% over the next few decades

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2020/2021
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