One of the steps shown is not required to solve the problem . A traffic sign uses solar panel for its power without being connected to grid. The dimensions are given. The wind blows over it with the given speed. The back side of panel is insulated and the panel surface has emissivity of 1. The efficiency of the solar panel is defined as electricity power produced over incident solar heat flux and it is function of temperature, η=15% at 20 C and drops 0.25 % per 1 degree Celsius temperature drop. Wasted

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.