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electricity

number density

number of free charge carries per unit volume

current

rate of flow of charge

voltage

energy transferred per unit charge, from electrical energy to other forms

emf

energy per unit charge from other forms to electrical - work done to charge carriers

internal resistance

resistance within components which dissipates energy and causes loss of voltage

kirchoffs 1st law

the sum of the currents entering a function is equal to sum of the currents out, conservation of charge

kirchoffs 2nd law

sum of the emf in a closed circuit is equal to the sum of potential difference, conservation of energy

conventional current

electrons move from positive to negative

drift velocity

average velocity of the charge carriers travelling through a conuctor I = Anev

power

rate of work done and energy transferred to an appliance per second

ohms law

current is proportional to potential difference for a conductor at a constant temperature

resistance

the difficulty for a current to flow through a conductor

resistivity

measures the extent to which a material opposes the flow of electric current through it

diode

A component that allows current through in one direction only heavy resistance in other directions

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