GCSE AQA Physics Current, Potential Difference & Resistance: A student investigated how the t

Question

A student investigated how the total resistance of identical resistors connected in series varied with the number of resistors.

The student used an ohmmeter to measure the total resistance of the resistors.

Figure 6 shows the student's circuit with 3 resistors.

The student repeated each reading of resistance three times.
Table 1 shows the student's results for 3 resistors in series.

Number of resistors

Reading 1
Reading 2
Reading 3
Mean

3
35.9
36.0
36.1
36.0

Calculate the mean resistance of 1 resistor.

What was the resolution of the ohmmeter the student used?
Tick (✓) one box.

0.1 Ω
0.2 Ω
1.1 Ω
36.0 Ω

How do the results show that the student's measurements were precise?
Tick (✓) one box.

The measurements are accurate.
The measurements are grouped closely together.
The measurements are reproducible.

Figure 7 shows the results.

How do the results show that the total resistance is directly proportional to the number of resistors?
Tick (✓) one box.

The results give a line with a positive gradient.
The results give a straight line that would go through the origin.
The results show a linear relationship.

A student investigated how the total resistance of identical resistors connected in series varied with the number of resistors - AQA - GCSE Physics - Question 4 - 2020 - Paper 1

Worked Solution & Example Answer:A student investigated how the total resistance of identical resistors connected in series varied with the number of resistors - AQA - GCSE Physics - Question 4 - 2020 - Paper 1

How do the results show that the total resistance is directly proportional to the number of resistors?

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