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2.1 Current, potential difference and resistance

2.1 Current, potential difference and resistance

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Question 11

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. Table 1 shows the student's results for 4 resistors in series.

Table 1

Number of resistorsReading 1 (Ω\OmegaΩ)Reading 2 (Ω\OmegaΩ)Reading 3 (Ω\OmegaΩ)Mean (Ω\OmegaΩ)
459.860.060.260.0
a.

Calculate the mean resistance of 1 resistor.

[2]
b.

What was the resolution of the ohmmeter the student used?

  • 0.1 Ω0.1\ \Omega0.1 Ω
  • 0.2 Ω0.2\ \Omega0.2 Ω
  • 1.0 Ω1.0\ \Omega1.0 Ω
  • 60.0 Ω60.0\ \Omega60.0 Ω
[1]
c.

How do the results show that the student's measurements were precise?

  • The measurements are accurate.
  • The measurements are grouped closely together.
  • The measurements are reproducible.
[1]
d.

How would a graph of mean total resistance against the number of resistors show that the total resistance is directly proportional to the number of resistors?

  • The results give a line with a positive gradient starting from the y-axis.
  • The results give a straight line that would go through the origin.
  • The results show a linear relationship with a non-zero intercept.
[1]
e.

Predict the mean total resistance of 8 of these resistors connected in series.

[2]
Markscheme

2.1 Current, potential difference and resistance Questions

  1. GCSE
  2. /Physics
  3. /2.1 Current, potential difference and resistance

39 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.

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