Opposition offered by inductance =

IZ-90 ° V/ (L)Z-90 ° = (LZ0 ° - (-90) ° = XlZ90 ° = jXL ohm (A.19)

The quantity jXL = j (L = j2nfL is known as inductive reactance and represents the 'opposition' to the flow of current when a voltage of frequency f Hz is applied across an inductance of L henry. The 90 ° phase lag that occurs to the current with respect to the voltage in an inductive element is conveniently incorporated in the description of the reactance through the operator j. There is nothing 'imaginary' of course about a reactor that consists typically of a coil of wire. However, as will be shown later, by assigning the j operator to the reactance the calculations are enormously assisted.

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Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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