Edexcel•GCSE•Physics
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Electricity and Circuits
Current, voltage, resistance, Ohm's law, series and parallel circuits
Practice 41 subtopics in Electricity and Circuits. All questions match the Edexcel GCSE specification.
About Electricity and Circuits
Electricity and Circuits is a key topic in the Edexcel GCSE Physicsspecification. This topic covers current, voltage, resistance, ohm's law, series and parallel circuits.
Master all 41 subtopics below with unlimited AI-generated questions. Each subtopic page includes sample questions and the ability to generate unlimited practice questions with detailed solutions.
All Subtopics (41)
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Electric current as flow of chargeCharge equation (Q = It)Conventional current directionElectron flow directionCircuit symbolsDrawing circuit diagramsPotential difference (voltage)Resistance definitionOhm's law (V = IR)Calculating current, voltage, resistanceFactors affecting resistance (length, cross-sectional area, material, temperature)Core Practical: Investigate I-V characteristicsI-V graph for resistor (straight line through origin)I-V graph for filament lamp (curved)I-V graph for diode (one direction only)Core Practical: Investigate resistance of a wireSeries circuit rulesCurrent same throughout series circuitVoltage shared in series (adds up)Total resistance in series (R = R₁ + R₂ + R₃)Parallel circuit rulesVoltage same across parallel branchesCurrent splits at junctionsTotal current = sum of branch currentsResistance in parallel (less than smallest)Calculating parallel resistance (1/R = 1/R₁ + 1/R₂) (H)Energy transfer in circuitsPower equations (P = IV, P = I²R, P = V²/R)Energy equation (E = Pt)Energy equation (E = QV)Cost of electricity calculationsKilowatt-hours (kWh)AC vs DCUK mains supply (230V, 50Hz)Three-core cable (live, neutral, earth)Live wire (brown) - 230V alternatingNeutral wire (blue) - completes circuit, ~0VEarth wire (green/yellow) - safetyFuses and circuit breakersHow fuses protect circuitsDangers of mains electricity
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