Presentation on theme: "The Data Sheet AQA AS Level. DATA - FUNDAMENTAL CONSTANTS AND VALUES Quality – highlight the ones you have come across – most are from A2! Symbol Value."— Presentation transcript:
DATA - FUNDAMENTAL CONSTANTS AND VALUES Quality – highlight the ones you have come across – most are from A2! Symbol Value - note most are 3 sig figs! Units – a useful place to look if you forget the case of the letter - N, kg, J, W, C, m etc.
Fundamental particles No excuse for classifying them incorrectly!
Quarks They even tell you that antiquarks have opposite signs.... The fact that baryon number is in thirds tells you a baryon has three quarks in it!
Leptons Charges are indicated Masses etc are in data section...
Photons – Electromagnetic quanta of energy and/or waves The first two deal with e.m. Waves deBroglie links particles (momentum – mass) and waves (wavelength) – used to find the wavelength of a mass particle
Electricity The first four can be used to express definitions...
Current - I Electric current is how much charge moves in unit time (rate of flow of charge) Need to know Q is Quantity of charge
Potential difference - V Potential difference is the energy transferred per unit charge (coulomb).
Resistance - R The electical resistance of a component is the ratio of the potential difference across the component to the current passing through it.
Electromotive force - The electromotive force is the energy per coulomb produced by a source of electricity.
EMF - EMF = voltage across external circuit (IR) plus voltage across the internal resistance (called ‘lost volts’) Now V = IR – so we can replace that... = V + Ir