FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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?
  1. 2 m2
  2. 4.5 m2
  3. 7.5 m2
  4. 10 m2
  5. 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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