Students are modelling the effect of the resistance of electrical cables,
The students investigate the effect of changing
- To analyse the data, the students use the following equation to calculate the resistance of the cables for the circuit.
-
- Show that this equation is true for the circuit shown in Figure 18. Show your working. (2 marks)
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- Calculate the values of
and write them in the spaces provided in the last column of Table 1 . (1 mark)
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- Plot a graph of
on the -axis against on the -axis on the grid provided below. On your graph:
-
- choose an appropriate scale and numbers for the
-axis - draw a straight line of best fit through the plotted points (3 marks)
- choose an appropriate scale and numbers for the
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- Use the straight line of best fit to find the value of the constant resistance globe,
. Give your reasoning. (2 marks)
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