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Electic

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Submitted By charlie818
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1. Electrical Energy

Electrical energy is indispensable in our life. Ranging from motion/power, heating/cooling, lighting and communication, all need electrical energy. To be more specific, examples of motion/power are the movement of cars, motor and so on. Examples of heating/cooling including the oven, air conditioner and refrigerator. Examples of lighting includes the lamp and flashlight that we always use in our daily life. And the examples of communication can be computer, mobile phone and television.
Unfortunately, the supply of electrical energy is limited, that’s why we are always educated to save the electricity. There have 5 main sources of electricity. First of all, burning of fossil fuels, oil and natural gas, this is the conversion of chemical energy into electrical energy. Secondly, heat from underground hot springs can generate electricity as well, this is the conversion from heat energy. Thirdly, the kinetic energy from the movement of water with tides, or the movement of wind turbines drive by wind can be used to generate electrical energy as well. Fourthly, energy stored in the nucleus of atoms (nuclear energy) is an important source too, as when nuclear energy is released, heat is produced which can generate electricity. Lastly, solar energy deserve our attention as well. Light rays from the sun are usually captured by the photovoltaics and semiconductors to generate electricity. As we can see, we always can extract electrical energy from nature and made usable, like from the solar energy, wind and fossil fuels. Yet, the problem is the supply is not stable. To be more specific, solar energy and wind not always exist, for example, at night we don’t have light energy from sun. Moreover, the supply of fossil fuels is limited.
Concerning about the transportability of electrical energy. Transport of electricity is usually via an extensive network of aerial and/or underground power lines. Transporting electricity is considered to be quite convenient and safe owing to the configuration of the power line. To be more specific, once the turbines generate the electricity, its voltage is significantly increased by passing it through step-up transformers, then the electricity is routed onto a network of high-voltage transmission lines capable of efficiently transporting electricity over long distances.
Storage of electrical energy is crucial as it can help solve the problem of fluctuation and undependable power supply, in other words, storage of electrical energy help improve the reliability of the power supply. Actually, some electrical storage system is available. for example, the Double-layer capacitors (DLC). The principle of energy storage is achieved by the separation of charge on a Helmholtz double layer at the interference between the surface of a conductive electrode and an electrolyte. In addition to this, superconducting magnetic energy storage (SMES) is a common storage system, too.
There is a lot safety issues related to electricity. For example, electric shock and short circuit which can cause a fire and put our live at a distinct disadvantages.
Concerning the convertibility of electricity, it is certainly very high. For example, it can be converted into light energy during lighting, which is what we need everyday.
All in all, electrical energy is closely related to our life, we should make effort to use electricity wisely( like switch off the light when it is not being used) in order to help its sustainable development!

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