A student is testing a small model wind turbine generator. During a trial, the turbine rotates steadily for 320 s. It produces a constant useful power output of 4.5 W and has an efficiency of 64%.
Calculate the total useful energy output of the generator during this trial.
State the equation linking efficiency, useful energy output, and total energy input.
Calculate the total energy input to the generator during this period.
12 exam-style questions on Edexcel IGCSE Physics Work and power. Each one has a worked solution and a mark scheme showing where the marks go.