Answer: C - It will need to be approximately 7.5 m2. 5x40 watts = 200 watts needed. With the efficiency of 15%, 1m2 will produce 27 watts. Thus, 200/27 = 7.41, or about 7.5 m2 of solar panel needed.

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FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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Solar panels are an environmentally-friendly way of producing electricity. Modern solar panels can reach 15% efficiency for converting light into electricity. In Washington, the average sunlight is about 180 W/m². If someone wants a solar panel capable of powering five 40-watt lights, how big will it need to be?

2 m²
4.5 m²
7.5 m²
10 m²
15 m²

Explanation

Answer: C - It will need to be approximately 7.5 m². 5x40 watts = 200 watts needed. With the efficiency of 15%, 1m² will produce 27 watts. Thus, 200/27 = 7.41, or about 7.5 m² of solar panel needed.

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FCAT Grade 8 Science Assessment Practice Questions

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FCAT Grade 8 Science Assessment Practice Questions

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