PHY 121 Lecture Notes - Lecture 28: Wind Turbine, Lightning, Wave Power

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Photovoltaic effect is related to the photoelectric but they are fundamentally different concepts. Disadvantages: intermittent, noisy, impact on wildlife, possible link to affecting local climate. In 2013, wind power in the united states increased bringing the 5-year growth of new generating capacity to 31%. Worldwide, china has the highest capacity followed by the usa and germany. Wind energy is harnessed with wind turbines in different configurations with advantages and drawbacks that depend on efficiency, engineering difficulties and cost. Most popular wind turbine type is the horizontal axis wind turbine. Power of a wind turbine depends on diameter, d, of the blades and the speed, v, of the wind, with the maximum power given by. (maximum power) = (k)(diameter squared)(velocity cubed) where k is a constant normally equal to 0. 48 kg/m cubed. Theoretically, the efficiency of a wind turbine can be no more than about 59%, while the actual efficiencies are at most 35%.

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