An electric motor accelerates a pottery wheel to its working speed. The motor transfers 360 J usefully to the kinetic energy store of the wheel. The efficiency of the motor is 45%.
Calculate the motor's energy input while the wheel reaches its working speed.
100 exam-style questions on Edexcel GCSE Physics 3.2 Dissipation and efficiency, covering 3.2.1 Dissipation of energy, 3.2.2 Reducing unwanted energy transfers, 3.2.3 Efficiency, and 3.2.4 Increasing efficiency. Each one has a worked solution and a mark scheme showing where the marks go.