true or false. If false, why? 6. the following mathematical formula: P ? g ? Q h

Question

true or false. If false, why?

6. the following mathematical formula: P ? g ? Q h where: P is the power in kilowatts; g is the gravitational acceleration; n is the turbine-generator efficiency; Q is the water flow rate; and h is the effective head 7. Most solar cells are ~60% efficient at converting sunlight into electricity. 8. Passive solar heating functions by incorporating building features that absorb heat and then release it slowly to maintain the temperature within the building. 9. Small-scale wind turbines are more efficient in urban environments than in rural environments. 10. Wind speed generally decreases with height; the higher the wind tower the smaller the wind speed.

Explanation / Answer

6. False , shaft power = runner power -losses

7. False , because of temperature effect and cell temperature ,they tend to produce higher voltage as temperature drops and conversly to lose voltage in high temperatures.

8. true

9 . true

10. False , because friction is more near the earth surface

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