Physics (AS & A Level) · Oct / Nov 2025 · Paper 52 · Question 1

Fig. 1.1 shows a model wind turbine with blades, each of length L, placed in moving air. blade terminals bench turbine moving air L Fig. 1.1 The area of the circle swept by the blades of the turbine is A. The output of the turbine has two terminals. The turbine is connected to a resistor of resistance R. At a speed v of the moving air, the current in the resistor is I. The atmospheric pressure is P and the thermodynamic temperature of the air is T. It is suggested that I is related to v by the relationship I2R Q = APv3 2T where Q is a constant. Plan a laboratory experiment to test the relationship between I and v. Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine a value for Q. In your plan you should include: • the procedure to be followed • the measurements to be taken • the control of variables • the analysis of the data • any safety precautions to be taken. 3 Diagram 4 [15]

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