A-LevelPhysicsWork, energy and power9702/12 · May/June 2012 · Q181 Mark
The diagram shows the design of a water wheel which drives a generator to produce electrical energy. The flow rate of the water is 200 kg s⁻¹. The generator supplies a current of 32 A at a voltage of 230 V. [Figure 18.1] Ignoring any changes in kinetic energy of the water, what is the efficiency of the system?
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A14%
B16%
C22%
D47%
✓ Correct answer
D: 47%
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