Extended tier only
Tidal power electrically transfers energy in the kinetic store of moving water.
When the tide is moving, a portion of sea water passes through the turbine. The turbine has a cylindrical shape as the turbine spins in a circular path. A turbine is shown in Fig. 1.1.
The cylinder is 24 m long and has a radius of 5.0 m. The tide is travelling at 6.0 m/s.
Calculate the kinetic energy of this cylinder of sea water.
Density of sea water = 1020 kg/m3
[4]
(ii)
Calculate the time taken for 24 m of water to pass through the turbine at 6.0 m/s.
[1]
(iii)
Calculate the power transferred to the turbine.
[1]
(iv)
The turbine's electrical power output is 7.0 MW. Calculate its efficiency.
[1]