A student sets up a circuit to investigate how adding identical resistors in parallel affects the total resistance.
They record their results in the table below:
| Number of resistors in parallel | Total current in mA | Potential difference in V |
|---|---|---|
| 1 | 15.0 | 4.50 |
| 2 | 30.0 | 4.50 |
| 3 | 45.0 | 4.50 |
| 4 | 60.0 | 4.50 |
Using data from the table, explain what happens to the total resistance of the circuit as the number of resistors in parallel increases.
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.