IB Physics: Part 1- Electric Potential Difference, Current, and Resistance
Part 1 – Electrical Potential Difference
Define electric potential difference.
Definition:
“This is the work done per unit charge to move a positive test charge from Points A to Point B”
Determine the change in potential energy when a charge moves between two points at different potentials.
Alright, pretend you have an electric field. If you want to move from Point B to Point A or vice-versa, what must you apply? Work.
As you move the charge from Point B to Point A, the charge is gaining electrical potential energy. To move the charge, work must be done.
Change in electric potential energy = Work done = Force x distance
= E x q x d
E = electrical field
q= charge
d = distance
Define the electronvolt.
Definition:
“Electronvolt is a replacement for the measure of energy (joule) at infinitesimally small quantities (subatomic ) e.g. electron, where the unit joule would be too large a measure”
The equivalency however, between joules and electronvolt is:
1 eV = 1.
6×10−19 Joules
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