The Data Sheet AQA AS Level DATA FUNDAMENTAL

The Data Sheet AQA AS Level

DATA - FUNDAMENTAL CONSTANTS AND VALUES • Quality – highlight the ones you have come across – most are from A 2! • 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.

Useful. .

Probably not needed. . More an A 2 requirement!

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 • de. Broglie 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. e

EMF - e • EMF = voltage across external circuit (IR) plus voltage across the internal resistance (called ‘lost volts’) • Now V = IR – so we can replace that. . . • e = V + Ir

Resistor combinations

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

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

AC • • Io is the peak current Vo is the peak voltage IRMS is the root mean square current VRMS is the root mean square voltage

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