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Figure 3 shows some of the apparatus that students use to determine the resistance of a piece of iron wire - Edexcel - GCSE Physics - Question 2 - 2023 - Paper 2
Question 2
Figure 3 shows some of the apparatus that students use to determine the resistance of a piece of iron wire. Add connecting wires, a voltmeter and an ammeter to comp... show full transcript
Worked Solution & Example Answer:Figure 3 shows some of the apparatus that students use to determine the resistance of a piece of iron wire - Edexcel - GCSE Physics - Question 2 - 2023 - Paper 2
Step 1
Add connecting wires, a voltmeter and an ammeter
Answer
To complete the circuit shown in Figure 3:
- Connect the voltmeter in parallel with the iron wire. This allows the voltage across the wire to be measured accurately.
- Connect the ammeter in series with the iron wire, ensuring that current flow through the wire is measured correctly.
- Use connecting wires to link the battery, variable resistor, and apparatus as shown. The variable resistor allows for the adjustment of current in the circuit.
Step 2
Step 3
Step 4
Explanation linking any two factors
Answer
Increasing the resistance through the variable resistor keeps the current constant. This is important because when the current is consistent, it prevents overheating of the iron wire due to excess flow of electrons, ensuring accurate resistance measurements.