A student investigates how the current in a component Y varies with the potential difference across it.
The Table shows the results.
Table
| Potential difference in V\text{V}V | Current in A\text{A}A |
|---|---|
| 0 | 0 |
| 1.0 | 0.25 |
| 2.0 | 0.40 |
| 3.0 | 0.50 |
| 4.0 | 0.57 |
| 5.0 | 0.62 |
Calculate the resistance of component Y at 1.0 V and at 5.0 V.
Deduce whether component Y is a fixed resistor or a filament lamp.
Give a reason for your answer.
The student reverses the connections to the power supply and sets the potential difference to -3.0 V.
Predict the current in component Y.
Suggest one improvement to the student's method.
Give a reason for your improvement.
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.