An experimental physicist is investigating the electrical characteristics of a newly synthesized thin-film manganite sensor. The table below shows the measured current through the sensor when a constant potential difference of 12.5 V12.5\text{ V}12.5 V is maintained across it at a temperature of 150 K150\text{ K}150 K.
| Potential difference (V) | Current 1st reading (A) | Current 2nd reading (A) | Current 3rd reading (A) | Mean current (A) |
|---|---|---|---|---|
| 12.5 | 1.65 | 1.12 | 1.71 | ImeanI_{\text{mean}}Imean |
Calculate the mean current ImeanI_{\text{mean}}Imean.
39 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.