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The International Space Station (ISS) has several solar panels called wings - Edexcel - GCSE Physics - Question 1 - 2015 - Paper 1
Question 1
The International Space Station (ISS) has several solar panels called wings. The wings convert energy from the Sun into a form useful in the ISS. (a) The energy re... show full transcript
Worked Solution & Example Answer:The International Space Station (ISS) has several solar panels called wings - Edexcel - GCSE Physics - Question 1 - 2015 - Paper 1
Step 1
Step 2
What is the percentage efficiency of the wing?
Answer
To calculate the percentage efficiency of the wing:
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Determine the energy incident on the wing from the Sun:
The energy incident on the wing is five times the useful energy available. Hence,
egin{align*} ext{Energy incident} = 5 imes 34.3 ext{ kJ} = 171.5 ext{ kJ} ext{(1)} \ \ ext{2.} \text{ Use the efficiency formula:}
\egin{align*} ext{Efficiency} = \frac{\text{Useful Energy Output}}{\text{Total Energy Input}} \times 100\ \, \ ext{3. Substitute the values:}
\text{Efficiency} = \frac{34.3 ext{ kJ}}{171.5 ext{ kJ}} \times 100\ \end{align*}
= 20%
This indicates that the percentage efficiency of the wing is 20%.