A wind farm operator currently has a wind farm situated on cropland that has: Four 250KW machines with 13.5m blades and a hub height of 30m They are considering re-powering their site with: Four 2MW machines with 60m blades and a hub height of 90m. The operator knows from experience that the average wind speed at 30m is 7m/s. What is the power produced at 7m/s 30m hub height in MW? You may find the following information useful:- Terrain type Power law exponent (x) Smooth sea 0.12 Short grass 0.13 0.14 crops rural forest 0.16 h 0.23 Power in the Wind = ½0AV3 Vref suburban 0.24

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.