A fixed resistor has 4.8 V across it when the current is 160 mA. A student needs a current of 80 mA through the same resistor. What potential difference is needed?
2.4 V2.4\ \mathrm{V}2.4 V
1.2 V1.2\ \mathrm{V}1.2 V
0.60 V0.60\ \mathrm{V}0.60 V
9.6 V9.6\ \mathrm{V}9.6 V
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.