Determine the electrical resistance of a light-dependent resistor (LDR) in a solar-tracking control system when the potential difference across the LDR is 1.35 V and the electric current passing through it is 750 μA750\ \mu\text{A}750 μA.
Use the equation:
R=VI R = \frac{V}{I} R=IV59 exam-style questions on Edexcel GCSE Physics 10.2 Resistance. Each one has a worked solution and a mark scheme showing where the marks go.