Paper 4 H - SAMPLE SET 1 Q7
7) Electricity in the UK is generated in many ways.
Figure 7 shows an undersea turbine.
The undersea turbine uses tidal energy to generate electricity.
Figure 7 shows an undersea turbine.
The undersea turbine uses tidal energy to generate electricity.
7.1) What is the original source of energy for tidal power schemes?
[1 mark]
7.2) Explain two advantages of using undersea tidal turbines to generate electricity rather than burning fossil fuels. [4 marks]
7.3) Some power stations burn wood instead of fossil fuels to generate electricity.
A coal-burning power station burns 6 million tonnes of coal per year.
Coal has an average energy value of 29.25 MJ per kg.
Wood chip from willow trees has an energy value of 13 MJ per kg.
A hectare of agricultural land can produce 9 tonnes of dry willow wood per year.
If this power station burned dry willow wood instead of coal, how much agricultural land would be needed to grow the willow? [3 marks]
7.2) Explain two advantages of using undersea tidal turbines to generate electricity rather than burning fossil fuels. [4 marks]
7.3) Some power stations burn wood instead of fossil fuels to generate electricity.
A coal-burning power station burns 6 million tonnes of coal per year.
Coal has an average energy value of 29.25 MJ per kg.
Wood chip from willow trees has an energy value of 13 MJ per kg.
A hectare of agricultural land can produce 9 tonnes of dry willow wood per year.
If this power station burned dry willow wood instead of coal, how much agricultural land would be needed to grow the willow? [3 marks]
Amount of land needed = ____________________ hectares
7.4) Table 3 shows the carbon dioxide emissions of four fuels used to generate electricity.
7.4) Direct CO2 emissions are the amounts of carbon dioxide released when the fuel is burned.
Lifecycle CO2 emissions is the total amount of carbon dioxide released during all stages from fuel extraction to when the fuel has been used.
Use the data from Table 3 to explain why wood is considered to be a low carbon dioxide emitting fuel. [2 marks]
(Total for Question 7 = 10 marks)
Lifecycle CO2 emissions is the total amount of carbon dioxide released during all stages from fuel extraction to when the fuel has been used.
Use the data from Table 3 to explain why wood is considered to be a low carbon dioxide emitting fuel. [2 marks]
(Total for Question 7 = 10 marks)