During a bench test, a battery-powered door chime, a switch and an ammeter form one loop. The ammeter reads a current while the switch is closed. The switch is then opened. Which description matches the ammeter reading now?
The ammeter reads no current.
The ammeter reads a smaller, non-zero current than before.
The ammeter reads a larger current than before.
The ammeter reads the same current as before.
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.