10 (a) Figure 13 shows wind turbines, used to generate electricity for the National Grid. The wind turns the turbine blades. The wind is a renewable source of energy. State two other renewable sources of energy. 1. 2. (ii) For one turbine -- the energy input per second from the wind is 6.2 kJ the energy output per second to the National Grid is 2.2 kJ. Calculate the efficiency of this turbine. efficiency = (iii) Suggest a reason why it is impossible for the turbine to use all the kinetic energy of the wind. (b) Nuclear fission and nuclear fusion are two non-renewable sources of energy. Your comparison should refer to: the differences between nuclear fission and nuclear fusion the relative advantages and difficulties involved in using these sources.

GCSE Edexcel Physics Energy resources: 10 (a) Figure 13 shows wind turb

10 (a) Figure 13 shows wind turbines, used to generate electricity for the National Grid - Edexcel - GCSE Physics - Question 10 - 2021 - Paper 1

Question 10

10 (a) Figure 13 shows wind turbines, used to generate electricity for the National Grid. The wind turns the turbine blades. The wind is a renewable source of energ... show full transcript

Worked Solution & Example Answer:10 (a) Figure 13 shows wind turbines, used to generate electricity for the National Grid - Edexcel - GCSE Physics - Question 10 - 2021 - Paper 1

Step 1

State two other renewable sources of energy.

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Answer

Solar energy
Biomass

Step 2

Calculate the efficiency of this turbine.

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Answer

The efficiency can be calculated using the formula:

ext{efficiency} = \left( \frac{\text{output energy}}{\text{input energy}} \right) \times 100

Substituting the values:

\text{efficiency} = \left( \frac{2.2\, \text{kJ}}{6.2\, \text{kJ}} \right) \times 100 = 35.48\% \approx 35\%

Step 3

Suggest a reason why it is impossible for the turbine to use all the kinetic energy of the wind.

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Answer

Air must move on the other side of the blades for the system to work, meaning not all kinetic energy can be converted into mechanical energy.

Step 4

Compare nuclear fission and nuclear fusion as sources for generating electricity using a nuclear reactor.

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Answer

Differences between Nuclear Fission and Fusion

Nuclear Fission: Involves splitting a heavy nucleus by a neutron, resulting in two daughter nuclei, more neutrons, and energy release, which can initiate a chain reaction.
- Advantages: Currently in use, providing significant energy output.
- Disadvantages: Produces radioactive waste that is hard to dispose of, with a risk of accidents.
Nuclear Fusion: Involves joining light nuclei at high energy, temperature, and density, resulting in helium and energy production.
- Advantages: No harmful waste products.
- Disadvantages: Not yet achieved on a practical scale, with difficulties in achieving the required energy and conditions.

10 (a) Figure 13 shows wind turbines, used to generate electricity for the National Grid - Edexcel - GCSE Physics - Question 10 - 2021 - Paper 1

Worked Solution & Example Answer:10 (a) Figure 13 shows wind turbines, used to generate electricity for the National Grid - Edexcel - GCSE Physics - Question 10 - 2021 - Paper 1

State two other renewable sources of energy.

Calculate the efficiency of this turbine.

Suggest a reason why it is impossible for the turbine to use all the kinetic energy of the wind.

Compare nuclear fission and nuclear fusion as sources for generating electricity using a nuclear reactor.

Differences between Nuclear Fission and Fusion

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