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 complete the circuit in Figure 3 so that the students can determine the resistance of the piece of iron wire. Figure 4 shows a graph of the results.

GCSE Edexcel Physics Potential difference & resistance: Figure 3 shows some of the appar

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

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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

Figure 4 shows a graph of the results.

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Answer

From the graph, the resistance can be determined based on the corresponding values of length and resistance. A straight line within the shaded region of the graph should be drawn to ensure accurate representation of the data collected.

Step 3

Any number between 2.7 and 3.3 inclusive

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Answer

The resistance value measured can be stated as a number within the range of 2.7 to 3.3 ohms, inclusive.

Step 4

Explanation linking any two factors

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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.

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

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

Add connecting wires, a voltmeter and an ammeter

Figure 4 shows a graph of the results.

Any number between 2.7 and 3.3 inclusive

Explanation linking any two factors

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