A variable resistor is connected across a supply that maintains a constant potential difference.
The current through the variable resistor is 0.24 A when its resistance is 25 Ω.
The resistance is then increased to 50 Ω.
State what happens to the current through the variable resistor.
Give the new current through the variable resistor.
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.