A battery-powered tug pulls a train of luggage containers along a level service road at a steady speed.
The tug exerts a force of 320 N on the containers in the direction of motion. It travels 750 m in 5.0 minutes5.0\ \text{minutes}5.0 minutes.
During the journey, the total input power of the tug is 1.1 kW.
State what is meant by power.
Calculate the total energy supplied to the tug during the journey.
The manufacturer claims that at least 75% of the total energy supplied to the tug is transferred usefully to the containers.
Calculate the efficiency of the tug and state whether the manufacturer’s claim is supported.
Calculate the energy wasted by the tug during the journey.
128 exam-style questions on Edexcel GCSE Physics 8.3 Power and efficiency, covering 8.3.1 Power and 8.3.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.