A laboratory technician is investigating the electrical properties of a uniform strip of conductive carbon paper of total length 50 cm. They are provided with a fixed 12 V DC power supply, a rheostat, an ammeter, a voltmeter, and two metal contact probes.
Draw a circuit diagram of the apparatus the technician should set up to determine the resistance of a 25 cm section of this conductive strip.
Your circuit diagram must use standard circuit symbols and clearly show how the electrical connections to the 25 cm section of the strip are 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.