A technician checks the thermistor used in a room thermostat by measuring the potential difference across it and the current through it at two temperatures. The results are shown in the table.
| Temperature / °C | Potential difference / V | Current / A |
|---|---|---|
| 20 | 4.0 | 0.0020 |
| 60 | 4.0 | 0.0080 |
For each temperature, calculate the thermistor’s resistance using the meter readings.
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.