A student is provided with a variable DC power supply, an 80 cm length of constantan wire taped to a metre ruler, and other standard laboratory equipment.
Draw a circuit diagram of the apparatus the student should set up to determine the resistance of a 30 cm section of this wire.
Your circuit diagram must use standard circuit symbols and clearly show how the connection to the 30 cm section of the wire is made.
59 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.