Скачать или смотреть GCSE Physics Required Practical 3 | Investigating Resistance (AQA)

Master the AQA GCSE Physics Required Practical – Investigating resistance in one clear video. This experiment explores how the resistance of a wire depends on its length, and how to collect and analyse data using
R=V/I.

In this video, we will:
Explain the aim: to investigate how changing the length of a wire (or the arrangement of resistors) affects its resistance.
Show the full circuit setup using a power supply, ammeter, voltmeter, resistance wire and crocodile clips.
Walk through the step‑by‑step method: adjusting the wire length in measured steps, recording current and potential difference, and keeping the test fair.
Demonstrate how to calculate resistance for each length using R=V/I and record results in a clear table.
Help you plot and interpret a graph of resistance against length, and show how a straight line through the origin shows resistance is directly proportional to length.
Discuss sources of error and safety, including heating of the wire, zero errors, and how to improve reliability with repeats and averages.
Practise exam‑style questions based on this required practical, with model answers using key phrases like “directly proportional”, “control variables”, and “systematic error”.

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