28-06-2012, 12:29 PM
Introduction of Energy system
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Introduction and overveiw :-
Energy in a system may take on various forms (e.g. kinetic, potential, heat, light). The law of conservation of energy states that energy may neither be created nor destroyed. Therefore the sum of all the energies in the system is a constant.
Converting Footsteps Into Electricity:
Mechanical energy from piezoelectric generators
Israel-based Innowattech has developed a new alternative energy system that harvests mechanical energy imparted to roadways, railways and runways from passing vehicles, trains and pedestrian traffic and converts it into electricity by installing generators beneath a road’s asphalt layer.
Motion energy harvesting
Researchers are working to harness energy from movement — such as from walking and natural vibrations in the environment — by using “tunable” devices.
Their technology is basically a small cantilever that releases power when strained. It is several inches long and a quarter inch wide, with a magnet on one end that interacts with nearby movable magnets. By changing the distance of the movable magnets, the researchers were able to “tune” the interactions of the system with its environment, and thus produce electricity over a broader spectrum of frequencies.
lab analysis for working producer :-
The law of conservation of energy states that the total energy in an isolated system remains constant at all times. This energy will remain mechanical energy. That is it can be exchanged between one form of potential energy and another, or it can be exchanged between kinetic and potential energy. Suppose a spring is hung vertically with a mass attached to its lower end.
The force exerted on the spring by the mass will cause the spring to stretch and the mass will come to rest at its equilibrium position. If the mass is lifted a few centimeters above its equilibrium position and dropped, it will oscillate with simple harmonic motion. At the top and bottom of its motion the mass will be momentarily at rest and thus have zero kinetic energy. Choosing the lowest point in the oscillation as the reference level for gravitational potential energy, the total mechanical energy at this point will all be in the form of elastic potential energy of the spring.