A student investigates a fixed resistor. The ammeter reads 0.02 A when no current flows. This zero error remains the same during the investigation. The table shows the recorded readings.
| Potential difference / V\mathrm{V}V | Ammeter reading / A\mathrm{A}A |
|---|---|
| 2.0 | 0.12 |
| 4.0 | 0.22 |
| 6.0 | 0.32 |
What is the resistance after correcting for the zero error?
16.7 Ω16.7\ \Omega16.7 Ω
18.8 Ω18.8\ \Omega18.8 Ω
20.0 Ω20.0\ \Omega20.0 Ω
25.0 Ω25.0\ \Omega25.0 Ω
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.