A student investigates how the resistance of a length of constantan wire varies with its length LLL.
The student can connect the circuit to the test wire using either a thick crocodile clip (contact width ≈6 mm\approx 6\text{ mm}≈6 mm) or a sharp metal knife-edge jockey (contact width ≈0.2 mm\approx 0.2\text{ mm}≈0.2 mm).
How does using the knife-edge jockey affect the accuracy of the results and the resolution of the length measurement compared to using the crocodile clip?
Both accuracy and resolution are higher.
Accuracy is higher, but resolution is lower.
Accuracy is lower, but resolution is higher.
Both accuracy and resolution are lower.
39 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.