Resistance of a wire at a constant temperature
Lesson 2 / 9
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I can describe how to investigate the resistance of a wire at a constant temperature and make scientific conclusions.
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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.
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