CompressionĬompression can be tested by applying a force on top of the piece of metal. The tensile strength can be tested to see if the chosen metal will be fit for purpose by fixing a piece of metal to a point and then loading it with a pulling force. Tension can be tested by pulling opposite ends of the metal. It is therefore important to know how to test a metal so the correct one can be chosen for the specific task. shear - forces acting across the materialĮach metal type has different properties in relation to the way they react to each of the five forces.bending - forces at an angle to the material.There are five terms used to describe what type of force can act on a material: Plants such as rapeseed or willow are specifically grown as biomass crops so that they can be burned in a furnace.Forces act on materials all the time - even if a material appears stationary it still has a force acting on it. Objections from people in the surrounding environmentĪffects the wildlife by flooding the valleyīiomass energy involves growing plants or using animal materials, not for consumption but so that they can be burned to produce heat. Valves can be opened very quickly to produce energy at peak times The turbines turn generators to produce electricity. Once the water has built up behind the dam, it is directed and released by valves through turbines. Hydroelectric schemes use a dam to block a valley or a major river, often creating a reservoir behind the dam. Tidal power plants will last for a long timeĮnvironmental impact of tidal barrages is unknownĬould produce a fifth of the UK’s needs as it is an island surrounded by the sea Advantages of tidalĬonstruction of tidal barrages is expensive It also harnesses the reverse flow of the water when the tide goes out. The barrage is constructed so that the incoming tide passes through turbines to generate electricity. Tidal energy relies on the gravitational pull of the Moon, which causes the change in water levels known as tides.Ī tidal barrage is built across the mouth of a river where it meets the ocean. The UK currently only generates a small amount of energy from tidal power, but it is estimated that the UK could potentially harness around a fifth of its electricity demand in this way. Some people do not like the look of solar panels or feel that they spoil the appearance of a buildingĭoes not produce much electricity when there is considerable cloud cover, during the winter months or at night The placement of the solar panels is also very important to ensure they track the path of the sun and harness the optimum amount of solar energy. Solar power provides clean energy from a plentiful supply, but there is still considerable development work to be done to try to make solar panels more efficient. Solar panels are made from photovoltaic cells, which harness the Sun’s light energy and convert it into electricity. Some people do not like the look of wind turbines or feel that they spoil the natural landscape They cost a lot to build and put in place ![]() There is no cost for wind and the running cost of a wind turbine is relatively low When there are periods of low wind, little or no energy is produced ![]() ![]() Wind energy is constantly available and sustainable While there are many dotted around the countryside as single towers or in a small group, they are now more commonly grouped together off-shore in large quantities to form a wind farm. The blades turn with the wind, driving a generator, which produces the electricity. Wind energy is harnessed through the use of wind turbines - tall towers with three propeller blades (vanes) that appear frequently around the UK. Using energy and materials responsibly is an important aspect of designing Wind
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