A wind turbine is used to generate electricity.
At a particular wind speed, a volume of 1.8 × 104 m3 of air passes the blades each second. The density of air is 1.3 kg/m3. Calculate the mass of air passing the blades per second.
The power output of the turbine is directly proportional to the kinetic energy of the air passing the blades each second. Describe and explain the effect on the power output when the wind speed is doubled.
At a different wind speed, the wind turbine has a power output of 480 kW. The mass of air passing the wind turbine each second is 15,000 kg15,000 \text{ kg}15,000 kg. Calculate the speed of the air passing the blades. Assume that the process is 100% efficient.
Practise AQA GCSE Physics Energy transfers with exam-style questions for Foundation and Higher tier. 5 questions covering Power, Energy transfers in everyday appliances, and The National Grid, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.