An electronics technician investigated how the total resistance of identical precision resistors connected in series varied with the number of resistors. The technician used a high-precision digital multimeter to measure the total resistance of the resistors. Table 1 shows the technician's results for 5 resistors in series.

Table 1

Number of resistors	Reading 1 ( $Ω\Omega$ )	Reading 2 ( $Ω\Omega$ )	Reading 3 ( $Ω\Omega$ )	Mean ( $Ω\Omega$ )
5	219.95	220.05	220.00	220.00

Calculate the mean resistance of 1 resistor.

What was the resolution of the multimeter the technician used?

0.01 Ω
0.05 Ω
0.10 Ω
220.00 Ω

How do the results show that the technician'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 12 of these resistors connected in series.

Table 1

Number of resistors	Reading 1 ( $Ω\Omega$ )	Reading 2 ( $Ω\Omega$ )	Reading 3 ( $Ω\Omega$ )	Mean ( $Ω\Omega$ )
5	219.95	220.05	220.00	220.00

Calculate the mean resistance of 1 resistor.

What was the resolution of the multimeter the technician used?

0.01 Ω
0.05 Ω
0.10 Ω
220.00 Ω

How do the results show that the technician'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 12 of these resistors connected in series.

2 Electricity

Question 41

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2 Electricity

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2 Electricity Questions