Figure 1 shows some of the energy resources used to meet the demand for electrical power in the UK on one day in 2020. The maximum demand for electrical power on that day was at 6 pm. Determine the percentage of the maximum demand for electrical power that was generated using gas. Percentage = __________% The UK government wants to reduce carbon emissions as much as possible. Which energy resources need to be used to achieve this? Tick (✓) one box. Coal and gas Gas and nuclear Wind and coal Wind and nuclear A network of transformers and transmission cables transfers electrical power from power stations to consumers. What is this network called? Explain how using step-up transformers makes the network efficient.

GCSE AQA Physics Combined Science National & Global Energy Resources: Figure 1 shows some of the energ

Figure 1 shows some of the energy resources used to meet the demand for electrical power in the UK on one day in 2020 - AQA - GCSE Physics Combined Science - Question 1 - 2022 - Paper 1

Question 1

Figure-1-shows-some-of-the-energy-resources-used-to-meet-the-demand-for-electrical-power-in-the-UK-on-one-day-in-2020-AQA-GCSE Physics Combined Science-Question 1-2022-Paper 1.png

Figure 1 shows some of the energy resources used to meet the demand for electrical power in the UK on one day in 2020. The maximum demand for electrical power on th... show full transcript

Worked Solution & Example Answer:Figure 1 shows some of the energy resources used to meet the demand for electrical power in the UK on one day in 2020 - AQA - GCSE Physics Combined Science - Question 1 - 2022 - Paper 1

Step 1

Determine the percentage of the maximum demand for electrical power that was generated using gas.

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Answer

To determine the percentage, we can observe from the graph that the maximum demand for electrical power at 6 pm is 30,000 GW, and the amount generated using gas is 16,500 GW. We can apply the formula:

$ext{Percentage} = rac{ ext{Gas Demand}}{ ext{Total Demand}} imes 100 = rac{16500}{30000} imes 100 = 55\%$

Step 2

Which energy resources need to be used to achieve this? Tick (✓) one box.

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Answer

The correct choice is:

Coal and gas ✓

Step 3

What is this network called?

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Answer

This network is called the national grid.

Step 4

Explain how using step-up transformers makes the network efficient.

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Answer

Step-up transformers improve the efficiency of the network by:

Increasing Potential Difference: They raise the voltage, which minimizes energy loss during transmission.
Reducing Current: As voltage increases, the current flowing through the cables decreases, which reduces heat generated due to resistance.
Lower Energy Loss: By reducing the current, less energy is lost as heat to the surroundings, allowing more efficient power transfer over long distances.

Figure 1 shows some of the energy resources used to meet the demand for electrical power in the UK on one day in 2020 - AQA - GCSE Physics Combined Science - Question 1 - 2022 - Paper 1

Worked Solution & Example Answer:Figure 1 shows some of the energy resources used to meet the demand for electrical power in the UK on one day in 2020 - AQA - GCSE Physics Combined Science - Question 1 - 2022 - Paper 1

Determine the percentage of the maximum demand for electrical power that was generated using gas.

Which energy resources need to be used to achieve this? Tick (✓) one box.

What is this network called?

Explain how using step-up transformers makes the network efficient.

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