Year 10 - Science
Resistance of a wire at a constant temperature
Electric fields and circuit calculations
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers static electricity, electric fields, and current flow in series and parallel circuits. It explains current, resistance, and potential difference relationships and explores diodes, thermistors, and LDRs. The focus is on calculations, experiments, and accurate measurements.
Lesson Summary
You will learn to describe how to investigate the resistance of a wire at a constant temperature and make scientific conclusions.
Key Notes
- 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.
Vocabulary To Learn
- 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 Mistakes To Avoid
- Pupils may not realise that the resistance of a wire varies with temperature.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key 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.
2. Define this scientific word and use it in context. 'independent variable'
the variable that the person doing the experiment changes. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils may not realise that the resistance of a wire varies with temperature. Correction: 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.
More Lessons In This Unit
- Adding components to a parallel circuit Study Guide
- Analysing parallel circuits Study Guide
- Analysing parallel circuits: including complex calculations Study Guide
- Analysing series circuits Study Guide
- Analysing series circuits: including complex calculations Study Guide
- Electric fields Study Guide
- Linking current, potential difference and resistance Study Guide
- Moving electric charge Study Guide
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