A student tests the current at three positions in a series circuit containing two matched filament lamps. The same ammeter is moved between the three positions. The student records one reading at each position and leaves the switch closed throughout the test.
Suggest a change that would make the current readings more reliable.
Give a reason for the change.
81 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.