Numbers
AQA A-Level Physics 7408
Measurements and Their Errors
Particles and Radiation
Topic overviewConstituents of the atomStable and unstable nucleiParticles, antiparticles and photonsParticle interactionsClassification of particlesQuarks and antiquarksApplications of conservation lawsThe photoelectric effectCollisions of electrons with atomsEnergy levels and photon emissionWave-particle duality
Waves
Mechanics and Materials
Electricity
Further Mechanics and Thermal Physics
Fields and Their Consequences
Topic overviewFieldsNewton's lawGravitational field strengthGravitational potentialOrbits of planets and satellitesCoulomb's lawElectric field strengthElectric potentialCapacitanceParallel plate capacitorEnergy stored by a capacitorCapacitor charge and dischargeMagnetic flux densityMoving charges in a magnetic fieldMagnetic flux and flux linkageElectromagnetic inductionAlternating currentsTransformers
Nuclear Physics
AstrophysicsOptional topic
Topic overviewAstronomical telescope consisting of two converging lensesReflecting telescopesSingle dish radio telescopes, I-R, U-V and X-ray telescopesAdvantages of large diameter telescopesClassification by luminosityAbsolute magnitude, MClassification by temperature, black-body radiationPrinciples of the use of stellar spectral classesThe Hertzsprung-Russell (HR) diagramSupernovae, neutron stars and black holesDoppler effectHubble's lawQuasarsDetection of exoplanets
Medical PhysicsOptional topic
Topic overviewPhysics of visionDefects of vision and their correction using lensesEar as a sound detection systemSensitivity and frequency responseDefects of hearingSimple ECG machines and the normal ECG waveformUltrasound imagingFibre optics and endoscopyMagnetic resonance (MR) scannerThe physics of diagnostic X-raysImage detection and enhancementAbsorption of X-raysCT scannerImaging techniquesHalf-lifeGamma cameraUse of high-energy X-raysUse of radioactive implantsImaging comparisons
Engineering PhysicsOptional topic
Turning Points in PhysicsOptional topic
Topic overviewCathode raysThermionic emission of electronsSpecific charge of the electronPrinciple of Millikan's determination of the electronic charge, eNewton's corpuscular theory of lightSignificance of Young's double slits experimentElectromagnetic wavesThe discovery of photoelectricityWave–particle dualityElectron microscopesThe Michelson-Morley experimentEinstein's theory of special relativityTime dilationLength contractionRelativistic mass and energy
ElectronicsOptional topic
Topic overviewMOSFET (metal-oxide semiconducting field-effect transistor)Zener diodePhotodiodeHall effect sensorDifference between analogue and digital signalsLC resonance filtersThe ideal operational amplifierInverting amplifier configurationNon-inverting amplifier configurationSumming amplifier configurationReal operational amplifiersCombinational logicSequential logicAstablesPrinciples of communication systemsTransmission mediaTime-division multiplexingAmplitude (AM) and frequency modulation (FM) techniques
Fields and Their Consequences
Capacitance
- 3 things to know
- Papers 2 and 3
Overview
Defining capacitance, the farad, and the relationship between charge, voltage and capacitance.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Numbers
What do the symbols in C = Q/V mean, what is the unit of capacitance, and how is the farad expressed in coulombs and volts?
Numbers
Which rearrangements find capacitance and potential difference, and what happens to the potential difference if capacitance increases at constant charge?
Questions from this subtopic
Each one with the model answer underneath.
- 1
How is capacitance defined?
Model answer
Capacitance is the charge stored per unit potential difference across a capacitor.
- 2
What physical quantity does capacitance measure about a capacitor?
Model answer
It measures the ability of a capacitor to store charge for a given potential difference.
- 3
State the equation that defines capacitance.
Model answer
C = Q/V, where C is capacitance, Q is charge, and V is potential difference.
- 4
In the equation C = Q/V, what does each symbol represent?
Model answer
C is capacitance, Q is the charge stored on the capacitor, and V is the potential difference across it.
- 5
What is the SI unit of capacitance?
Model answer
The farad (F).
- 6
Why is the farad considered a very large unit in practical circuits?
Model answer
Because most capacitors store only small amounts of charge per volt, so capacitances are typically measured in microfarads (μF), nanofarads (nF), or picofarads (pF).
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