Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 3 - 2012 - Paper 1
Question 3
Complete the sentence by putting a cross (X) in the box next to your answer.
The output power of a solar panel is the rate of transfer of
☐ A current
☐ B electro... show full transcript
Worked Solution & Example Answer:Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Physics - Question 3 - 2012 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The output power of a solar panel is the rate of transfer of C energy.
Step 2
Describe the difference between direct current and alternating current.
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Answer
Direct current (DC) flows in one direction only, providing a constant voltage or current. In contrast, alternating current (AC) changes direction periodically and can vary in voltage and current over time.
Step 3
State why a transformer cannot be used to increase this voltage.
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Answer
A transformer cannot be used to increase the voltage from the solar panel because it operates only on alternating current (AC) and not on direct current (DC).
Step 4
Explain why using solar panels to generate electricity for the National Grid benefits the environment.
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Answer
Using solar panels for electricity generation helps reduce reliance on fossil fuels, which lowers greenhouse gas emissions and mitigates climate change. Furthermore, solar energy is renewable and reduces air pollution, contributing to a cleaner environment.
Step 5
Calculate the payback time for the solar panels by selling energy to the National Grid.
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Answer
The annual earnings from the solar panel can be calculated as:
Annual earnings = Average energy supplied (in kWh) × Payment per kWh = 800 kWh × £0.40 = £320.
Payback time = Cost of solar panel / Annual earnings = £4800 / £320 = 15 years.
