A monitoring panel at a sports centre is supplied by a 12 V supply. Two components are connected in parallel, and the current in each branch is shown in the table.
| Branch | Current / A\mathrm{A}A |
|---|---|
| 1 | 0.40 |
| 2 | 0.35 |
A resistor is to be connected as a third parallel branch. The required total resistance of the three-branch combination is 8.0 Ω.
Calculate the resistance of the resistor that must be added.
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.