1 (a) Figure 1 shows some of the apparatus that students use to determine the resistance of a piece of iron wire - Edexcel - GCSE Physics Combined Science - Question 1 - 2023 - Paper 2

To complete the circuit in Figure 1, the voltmeter should be connected in parallel with the iron wire to measure the voltage across it, while the ammeter should be connected in series with the iron wire to measure the current flowing through it. This setup allows for the determination of resistance using Ohm's Law, where Resistance (R) is given by the formula: $R = \frac{V}{I}$ where V is the voltage measured by the voltmeter and I is the current measured by the ammeter.