Physics



Physics

Energy conversion with examples

As postulated by the first law of thermodynamics, energy is neither created nor destroyed, but merely transformed. The energy can be transformed from one form to another, such as heat to electricity and electricity to heat. Although it can be converted into another form, it does not mean that it is always easy to process. The conversion from one form to another is also an expensive process plus it is difficult as well. For example, 1kWh indicates that it is equivalent to 800 Kcal and 800 Kcal is equivalent to 1 kWh, although this does not mean that 860 Kcal may be obtained from 1 kWh. In fact, much less is obtained from the conversion of energy (Goswami & Kreith, 2008).

The energy conversion is a process that takes place in the biosphere. However, human beings throughout history have invented several devices that also allow for energy conversion. The efficiency with which this transformation occurs is directly related to the ratio of its final form and shape (Goswami & Kreith, 2008).

Fossil Fuels

Fossil fuels consist of deposits of fossil organisms that once were alive. Organic matter is formed during centuries. Fossil fuels consist mainly of carbon and hydrogen bonds. There are three types of fossil fuels that can be used for energy supply: coal, oil and natural gas. Coal is a fossil fuel that has formed over millions of years by the tank and fall to the ground plant material. When these layers are compacted and heated with time, the deposits are transformed into charcoal (Gorman, 2009).

Fossil fuels are energy sources formed from the decomposition of organic compounds over a long period. Examples of fossil fuels include energy sources such as oil, natural gas, and coal. Fossil fuels have been used since ancient times to generate light and ...