Resistance of a wire at a constant temperature
I can describe how to investigate the resistance of a wire at a constant temperature and make scientific conclusions.
Resistance of a wire at a constant temperature
I can describe how to investigate the resistance of a wire at a constant temperature and make scientific conclusions.
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Lesson details
Key learning points
- A wire heats up when a current flows and its temperature will vary over time.
- A water bath helps to keep the temperature of a wire constant.
- Turning a circuit on for a very short time reduces the heating effect in a wire.
- In electricity investigations, it is often easy to take lots of readings rather than a few, repeated readings.
- The resistance of a wire is directly proportional to its length, at a constant temperature.
Keywords
Independent variable - the variable that the person doing the experiment changes
Dependent variable - the variable that is measured; it changes as a result of varying the independent variable
Control variable - a variable that needs to be kept the same to allow a fair test to be carried out
Random error - a type of error that affects results in an unpredictable way
Directly proportional - describes the relationship between two variables if both increase in the same proportion as each other
Common misconception
Pupils may not realise that the resistance of a wire varies with temperature.
Ensure pupils are aware that the temperature of a metal wire does affect resistance and that precautions should be taken to avoid a temperature change.
To help you plan your year 10 combined science lesson on: Resistance of a wire at a constant temperature, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 10 combined science lesson on: Resistance of a wire at a constant temperature, download all teaching resources for free and adapt to suit your pupils' needs.
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Explore more key stage 4 combined science lessons from the Electric fields and circuit calculations unit, dive into the full secondary combined science curriculum, or learn more about lesson planning.
Equipment
Nichrome wire, crocodile clips, electrical leads, metre ruler, voltmeter and ammeter.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Starter quiz
6 Questions
V
Ω
A
a variable that needs to be kept the same in a fair test
the variable that is measured to get a set of results
the variable that the experimenter selects values for
$$y$$-axis
does not appear on the graph
$$x$$-axis
Exit quiz
6 Questions
