A student investigates how the resistance of a small heating element changes with potential difference.
The student obtains the following results:
| Potential difference (V) | Current (A) | Resistance (Omega\\OmegaOmega) |
|---|---|---|
| 2.0 | 0.50 | 4.0 |
| 4.0 | 0.80 | 5.0 |
| 6.0 | 1.00 | 6.0 |
| 8.0 | 1.14 | 7.0 |
| 10.0 | 1.25 | 8.0 |
The student writes this conclusion:
'The resistance of the heating element is directly proportional to the potential difference.'
Comment on the student's conclusion. Use data from Table 1 to support your answer.
59 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.