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 resistors	Reading 1 ( $Ω\Omega$ )	Reading 2 ( $Ω\Omega$ )	Reading 3 ( $Ω\Omega$ )	Mean ( $Ω\Omega$ )
4	59.8	60.0	60.2	60.0

Calculate the mean resistance of 1 resistor.

What was the resolution of the ohmmeter the student used?

$Ω0.1\ \Omega$
$Ω0.2\ \Omega$
$Ω1.0\ \Omega$
$Ω60.0\ \Omega$

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.

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.

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

Table 1

Number of resistors	Reading 1 ( $Ω\Omega$ )	Reading 2 ( $Ω\Omega$ )	Reading 3 ( $Ω\Omega$ )	Mean ( $Ω\Omega$ )
4	59.8	60.0	60.2	60.0

Calculate the mean resistance of 1 resistor.

What was the resolution of the ohmmeter the student used?

$Ω0.1\ \Omega$
$Ω0.2\ \Omega$
$Ω1.0\ \Omega$
$Ω60.0\ \Omega$

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.

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.

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

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