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Figure 6 shows how much electricity was generated using coal-fired and gas-fired power stations in January for 5 years in the UK - AQA - GCSE Physics - Question 4 - 2020 - Paper 1
Question 4
Figure 6 shows how much electricity was generated using coal-fired and gas-fired power stations in January for 5 years in the UK. Determine the percentage increase... show full transcript
Worked Solution & Example Answer:Figure 6 shows how much electricity was generated using coal-fired and gas-fired power stations in January for 5 years in the UK - AQA - GCSE Physics - Question 4 - 2020 - Paper 1
Step 1
Step 2
Give two environmental advantages of using a gas-fired power station to generate electricity compared with using a coal-fired power station.
Answer
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Gas-fired power stations emit less sulfur dioxide, which helps reduce acid rain formation.
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Gas combustion results in lower carbon dioxide emissions per kilogram of fuel burned, contributing less to global warming compared to coal.
Step 3
Explain how the data in Figure 7 suggests the student is wrong.
Answer
The data in Figure 7 indicates a steady increase in mean sea surface temperature over the years. Specifically, from 1988 to 2016, the temperature rose from approximately 16.45 °C to 16.96 °C, demonstrating a clear trend of rising temperatures. This consistent upward trend supports the notion that climate change is occurring.
Step 4
Which of the four thermistors would be the most suitable to measure the surface temperature of the sea? Explain your answer.
Answer
Thermistor C would be the most suitable option to measure the surface temperature of the sea. This is because the change in resistance is greatest between 0 °C and 25 °C, which allows for more sensitivity to temperature changes in that range. Additionally, the gradient of resistance change in Thermistor C is higher than that of the others, making it more responsive to temperature variations.