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25 terms

Y11 Electricity

key terms and formulae for the electricity topic
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Proton
Positively charged particle, found inside the nucleus of an atom
Electron
Negatively charged particle; located outside the atomic nucleus
Neutron
Neutral particle, found in the nucleus of an atom
ion
a charged atom, either positive or negative
staticly charged object
when an object has gained/lost electrons and has an overall unbalance of charge
static discharge
when charge flows to Earth, often as a spark
Earthed object
An object in contact with the ground via a conductor so no charge build up is possible
Current
The rate of flow of electrons
Amps
The unit of current
Voltage or potential difference
The energy given to the current
Volts
The unit of voltage/potential difference
Resistance
The opposition to the flow of current
Ohms
The unit of resistance
Resistance formula (Ohm's Law)
Resistance = Voltage / Current
Conductor
An material with 'free' electrons that charge can flow through easily
Insulator
A material that charge cannot easily flow through
Current formula
Current = charge / time
Voltage formula
Voltage = Energy transferred / charge
Coulomb
the unit of charge
The current in a series circuit
the same at all points
the voltage in a series circuit
shared between the components
total resistance in a series circuit
the sum of the individual resistances
the current in a parallel circuit
splits at a junction but the total current is constant
the current at a junction
takes the path of least resistance
the voltage in a parallel circuit
each branch gets the full voltage from the cell