Cooler, denser air flows toward the low pressure area at the surface to fill in the space left by the risen, heated air. This movement causes an area of low pressure at the surface, creating a vacuum that draws air in. The air above the land also gains thermal energy and expands, becoming less dense and rising. Radiation from the sun causes land to gain thermal energy. Wind is caused by differences in pressure created by the uneven heating of Earth's surface by the sun. Therefore, the more mechanical energy you start with - the faster the blades turn - the more electrical energy will be created by the turbine. Since energy is neither created nor destroyed, the greater the energy input, the greater the energy output will be. This causes a coiled wire to rotate around a magnet and creates an electrical current which we measure with a multimeter. ![]() Does the wind speed affect the electrical energy output?Īs the kinetic mechanical energy of the moving wind rotates the blades of the wind turbine, a generator inside the turbine is also rotated. How does the electrical output differ? Test the turbine with different wind speeds, such as low, medium and high fan settings.
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