INDEX of electricity notes section 3. igcse/gcse 9-1 Physics revision notes for AQA Edexcel OCR GCSE examinations

INDEX of Electricity Part 3 notes on:

Ohm's Law, experimental investigations of resistance and current-voltage graphs for selected devices and I-V graphs, calculations using I = V/R, Q = It and E = QV formulae

[Author © Dr WP Brown PhD: Doc Brown's physics exam revision notes suitable for students of UK IGCSE & GCSE level physics courses, ~ US grades 9-10 physics, electricity page updated Feb 8th 2026]

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Sub-index for this section 3 on Ohm's Law investigations, current-voltage graphs for devices and charge-energy transfer

3.1 Ohm's Law, investigation circuit, what affects resistance of a wire and V = IR calculations

3.2 Investigating the resistance of a wire at constant temperature, varying length and diameter

3.3 Investigating the current - voltage characteristics of a metal filament lamp (bulb) - graph explained

3.4 Investigating the current - voltage characteristics of a diode - graph explained

3.5 Movement and unit of electric charge, the coulomb, calculations using Q = It

3.6 How are potential difference and electrical energy transfer related?, E = QV calculations

3.7 How the total potential difference is split between resistances in series

See Part 1.1 for Important definitions, descriptions, formulae and units for electrical science

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Electricity and magnetism revision notes index

1. Usefulness of electricity, safety, energy transfer, cost & power calculations, P = IV = I²R, E = Pt, E=IVt

2. Electrical circuits and how to draw them, circuit symbols, parallel circuits, series circuits explained

3. Ohm's Law, experimental investigations of resistance, I-V graphs, calculations V = IR, Q = It, E = QV

4. Circuit devices and how are they used? (e.g. thermistor and LDR), relevant graphs

5. More on series and parallel circuits, circuit diagrams, measurements and calculations

6. The 'National Grid' power supply, environmental issues, use of transformers

7. Comparison of methods of generating electricity (= energy Part 6)

8. Static electricity and electric fields, uses and dangers of static electricity

9. Magnetism - magnetic materials - temporary (induced) and permanent magnets - uses

10. Electromagnetism, solenoid coils, uses of electromagnets

11. Motor effect of an electric current, electric motor, loudspeaker, Fleming's left-hand rule, F = BIL

12. Generator effect, applications e.g. generators generating electricity and microphone

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