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, you would need to connect the voltmeter in parallel with the iron wire and the ammeter in series with the iron wire. This setup allows for the measurement of voltage across the iron wire and the current flowing through it, enabling the calculation of resistance using Ohm's Law, which states that resistance (R) can be calculated as:

$R = \frac{V}{I}$

where V is the voltage across the wire and I is the current through the wire.