Wednesday 27 February 2013

Energy Transfer

Most of the machines or devices we use transfer cleverness from unrivaled nominate to another. Input push is taken in by the device in one form and transformed to siding pushing in another form.

An energy transfer plot or a Sankey diagram is used to show the transfer of energy across a process or a device. It is a flow diagram in which the widths of the arrows show the relative amounts of each type of energy.

An energy transfer diagram for a power station along with a Sankey diagram is shown below:

 




Efficiency

The efficiency of a device is calculated using the sideline formula:



DeviceLight Bulb power save Light Bulb
 
Energy Transfer DiagramElectrical Energy love and Light EnergyElectrical Energy Heat and Light Energy
Sankey Diagram
Efficiency
Efficiency = 100/5 x 100
Efficiency = 5%
Efficiency = 60/15 x 100
Efficiency = 25%
Explanation
Energy cannot be created nor destroyed. It can only be transformed from one form to another. Thus the 100J of electrical energy is transformed to 5 J of straighten out energy and 95J of heat energy. In the case of the abstemious bulb the 95J of energy transferred as heat is wasted energy as it is not useful because the purpose of the device is to acquire light.

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An ordinary light bulb works on the principle of a thin wire (filament) being heated by the resistance to the electrical current. At a temperature of about 1100°C it glows with a bright white light. As the electrical energy is required in heating the wire hence this is wherefore most of the energy is buy the farmn off as heat. Lamps which give of light when hot are called incandescent.

Energy saving light bulbs work on the principle of fluorescence. Here the electrical energy is supplied to electrodes which generate fast moving electrons that pass through a tube containing mercury gas. On collision with the mercury atoms invisible light is produced which then collides with the phosphor atoms coated around the tube converting the ultraviolet to visible...If you want to get a full essay, order it on our website: Ordercustompaper.com



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