Edexcel•A-Level•Physics
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Electric Circuits
Current, voltage, resistance, EMF and circuit analysis
Practice 44 subtopics in Electric Circuits. All questions match the Edexcel A-Level specification.
About Electric Circuits
Electric Circuits is a key topic in the Edexcel A-Level Physicsspecification. This topic covers current, voltage, resistance, emf and circuit analysis.
Master all 44 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 (44)
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Electric charge and the coulombCurrent as rate of flow of charge: I = ΔQ/ΔtConventional current vs electron flowCharge carriers in conductorsNumber density of charge carriersDrift velocity equation: I = nAvqPotential difference (voltage)Work done per unit chargeResistance: R = V/IOhm's law and ohmic conductorsResistivity: ρ = RA/LEffect of temperature on resistanceEffect of temperature on metalsEffect of temperature on semiconductorsCore practical: Resistivity of a wireI-V graphs for resistorsI-V graphs for filament lampsI-V graphs for diodesI-V graphs for thermistorsI-V graphs for LDRsCore practical: I-V characteristicsSeries circuitsParallel circuitsKirchhoff's first law (current)Kirchhoff's second law (voltage)Total resistance in seriesTotal resistance in parallelCombined series-parallel circuitsPower in circuits: P = IVP = I²R and P = V²/REnergy transfer: E = VItE = I²Rt and E = V²t/RKilowatt-hour calculationsElectromotive force (EMF)EMF vs terminal potential differenceInternal resistanceε = I(R + r)ε = V + Ir (lost volts)Core practical: EMF and internal resistancePotential divider principleVout = Vin × R₂/(R₁ + R₂)Sensor circuits with thermistorsSensor circuits with LDRsPotentiometer applications
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