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The Data Sheet AQA AS Level

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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.

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Useful....

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Probably not needed.. More an A2 requirement!

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Fundamental particles No excuse for classifying them incorrectly!

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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!

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Leptons Charges are indicated Masses etc are in data section...

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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

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Electricity The first four can be used to express definitions...

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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

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Potential difference - V Potential difference is the energy transferred per unit charge (coulomb).

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Resistance - R The electical resistance of a component is the ratio of the potential difference across the component to the current passing through it.

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Electromotive force - The electromotive force is the energy per coulomb produced by a source of electricity.

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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

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Resistor combinations

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Power – they already give you all combinations! (No excuse!!!)

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Resistivity is not another word for resistance! Resistivity is resistance of a specimen of unit length and unit cross sectional area. Unit is m not – they are different!

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AC I o is the peak current V o is the peak voltage I RMS is the root mean square current V RMS is the root mean square voltage

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Oscilloscope This is in the waves section – and is needed to interpret the trace on an oscilloscope.

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