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6. (a) Eric owns a small farm where chicks are hatched from eggs - Edexcel - GCSE Physics - Question 6 - 2013 - Paper 1
Question 6
6. (a) Eric owns a small farm where chicks are hatched from eggs. He is considering generating his own electricity to heat and light a barn rather than using electr... show full transcript
Worked Solution & Example Answer:6. (a) Eric owns a small farm where chicks are hatched from eggs - Edexcel - GCSE Physics - Question 6 - 2013 - Paper 1
Step 1
Use the data in the graph to recommend the best turbine for Eric's barn.
Answer
The best turbine is turbine A because it can produce up to 7,200 kWh per year at a wind speed of 13 mph, which exceeds the barn's requirement of 6,000 kWh per year. Turbine B, however, produces less than 6,000 kWh at that wind speed and requires a higher wind speed to meet the same energy output.
Step 2
Eric pays 14p per kWh for electrical energy supplied by the National Grid. Calculate how much he could expect to save each year by using the energy from this wind turbine to heat and light the barn.
Answer
To calculate the annual saving, we can substitute and evaluate:
- Cost per kWh = £0.14 (which is 14p)
- Annual energy requirement = 6,000 kWh
Annual saving = 0.14 * 6000 = £840.
Step 3
Step 4
Step 5
Compare hydro-electric power with solar power as energy resources for the large-scale generation of electricity.
Answer
Hydro-electric power (HEP) is renewable and capable of producing large amounts of energy, but it can cause environmental issues such as damming rivers and disrupting ecosystems. Solar power is also renewable and can reduce reliance on fossil fuels, yet it is limited by geographical factors and requires consistent sunlight. Additionally, solar energy generation is currently less efficient than HEP, producing less energy overall, which affects large-scale application.