When a Charge Drops Through a Voltage it Transfers Energy Flashcards
When an electrical charge goes through a change in voltage then…
Energy is Transferred
How is energy supplied to the charge?
At the power source to ‘raise’ it through a voltage
When does the charge give up this energy?
When it ‘falls’ through any voltage drop in components elsewhere in the circuit
The bigger the change in voltage…
The more energy is transferred for a given amount of charge passing through the circuit
What does this mean for a battery with bigger voltage?
Will supply more energy to the circuit for every coulomb of charge which flows round it
Why is this?
This is because the charge is raised up ‘higher’ at the start - and as the diagram shows, more energy will be dissipated in the circuit too
What is voltage?
Voltage is the energy transferred per unit charge passed
What is the unit for voltage?
One volt is one joule per coulomb
What is the equation relating charge, voltage and energy transferred?
Energy transferred = charge x voltage
What is the equation relating charge, voltage, resistance and energy transferred?
Energy transferred = charge x voltage x resistance
