More on Power
When an electrical charge goes through a change in potential difference, then energy is transferred
Energy is supplied to the charge at the power source to ‘raise’ it through a potential
The charge gives up this energy when it ‘falls’ through any potential drop in components elsewhere in the circuit.
Formula=E = QV
Energy Transferred= Charge flow x potential difference
That means that a battery with a bigger pd will supply more energy to the circuit for every coulomb of charge which flows around it, because the charge is raised up ‘higher’ at the start
As well as energy transferred in a given time, the power of an appliance can be found with
Power=Potential Difference x Current P=VI
You can also find the power if you don’t know the potential difference
P=I(2)R
When an electrical charge goes through a change in potential difference, then energy is transferred
Energy is supplied to the charge at the power source to ‘raise’ it through a potential
The charge gives up this energy when it ‘falls’ through any potential drop in components elsewhere in the circuit.
Formula=E = QV
Energy Transferred= Charge flow x potential difference
That means that a battery with a bigger pd will supply more energy to the circuit for every coulomb of charge which flows around it, because the charge is raised up ‘higher’ at the start
As well as energy transferred in a given time, the power of an appliance can be found with
Power=Potential Difference x Current P=VI
You can also find the power if you don’t know the potential difference
P=I(2)R