Question 11
FA student investigates how the resistance of a nichrome wire depends on the length of wire used. The wire is kept at a constant temperature. Figure shows the student's results.
Figure: The resistance of a nichrome wire plotted against the length of wire used
a.[1]
Give the resistance of 70 cm of the wire. Use Figure.
b.[1]
One of the plotted points in Figure 2 is anomalous. Give the length of wire at which the anomalous result was obtained.
c.[2]
Describe the relationship between the resistance of the wire and the length of wire used.
d.[2]
Explain why the temperature of the wire must be kept constant during the investigation.
e.[1]
Give one way the student could keep the temperature of the wire constant.
2.1 Current, potential difference and resistance Questions
82 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.