Resistance, V = IR and I–V Graphs: Resistor, Lamp, Diode | GCSE Physics

Resistance for GCSE Physics, animated: why a bigger resistance means a smaller current for the same potential difference, V = IR with its units and three worked examples (including the milliamp and kilohm trap), and how to measure resistance with an ammeter in series and a voltmeter in parallel. Then the three I–V graphs you need: a resistor at constant temperature (an ohmic conductor), a filament lamp (why the curve bends as the filament heats up), and a diode (current one way only). Finishes with the exam mistake of using the gradient instead of V ÷ I at a point. Covers: AQA 4.2.1.3–4.2.1.4 (Combined 6.2.1.3–6.2.1.4) · Edexcel Topic 10 (10.12, 10.13, 10.18, 10.21) · OCR Gateway P3.2 (Foundation and Higher, Combined and separate Physics). 0:00 Intro 0:08 Hook 0:39 Resistance and V = IR 1:20 Worked examples 1:58 The unit trap 2:52 Measuring resistance 3:34 I–V graph: a resistor 4:20 I–V graph: a filament lamp 5:01 I–V graph: a diode 5:36 Exam mistake: resistance from a graph 6:28 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.