A smart running shoe contains multiple kinetic energy harvesters embedded in the sole to power an integrated GPS tracker.
State the energy transfer taking place in these kinetic energy harvesters when the runner is in motion.
While running, the harvesters generate a constant average current of 12 mA12\text{ mA}12 mA. (i) State the equation linking charge, current, and time. (ii) Calculate the charge transferred by the harvesters during a run lasting 25 minutes25\text{ minutes}25 minutes.
The individual harvesters in the sole are connected in parallel. Suggest why they are connected in parallel rather than in series.
31 exam-style questions on Edexcel IGCSE Physics Electric charge. Each one has a worked solution and a mark scheme showing where the marks go.