An engineering student investigates how the terminal potential difference across a chemical cell varies with the current supplied to an external circuit, in order to determine its electromotive force (emf) and internal resistance.
Draw a suitable circuit diagram for this investigation.
Describe an experimental method the student could use to obtain the necessary measurements, and explain how they would analyse their data to determine both the emf and the internal resistance.
25 exam-style questions on Edexcel IGCSE Physics Energy and voltage in circuits. Each one has a worked solution and a mark scheme showing where the marks go.