Resistance and I–V Required Practical: Wire Length, Lamp and Diode | GCSE Physics

The GCSE Physics resistance and I–V characteristics practicals, animated step by step: measuring the resistance of a wire at different lengths with an ammeter and voltmeter (R = V ÷ I), a worked results table, plotting resistance against length and finding the gradient, and two 10 Ω resistors measured in series and in parallel. Then I–V characteristics with a variable resistor: a fixed resistor, a filament lamp and a diode with a protective resistor, reversing the connections for negative values, and why each graph has its shape. With errors and improvements (wire heating, the line that misses zero, fluctuating readings), safety, and a 6-mark exam-style question answered point by point. Covers: AQA required practicals 3 and 4 (Combined Science 15 and 16) · Edexcel core practical 10.17 · OCR PAG P6 and P7 (Foundation and Higher, Combined and separate Physics). 0:00 Intro 0:08 Aim 0:57 Part A: the wire 1:43 Part A: results and graph 5:52 Resistors in series and parallel 6:55 Part B: I–V characteristics 7:50 Part B: results and graphs 8:58 Errors, improvements and safety 10:01 Exam question 10:56 Summary Narrated with an AI voice. Worked Example is not affiliated with or endorsed by AQA, OCR or Pearson Edexcel. Exam board names are used only to show which specifications a video covers.