1a
5 marks
5 marksA wire-wound resistor can become hot when there is a current in it. This heating effect can be investigated using the apparatus shown.
A student investigated whether the temperature rise of the water ∆θ was proportional to the current I in the resistor. For each value of current, the student refilled the beaker with water at the same initial temperature.
i)
Identify two other control variables for this investigation.
(2)
ii)
The student recorded the following data.
| I/A | 1.5 | 2 | 2.5 | 3 |
| ∆θ | 3.5 | 7 | 9.5 | 15 |
Criticise the recording of this data.
(3)
1b2 marks
2 marksExplain one improvement the student could make to reduce the uncertainty in the measurement of ∆θ for each value of I.
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