Static electricity
Electric field intesity: E = KQ/d2 A field is determined by source charge only
Coulombs law: F = KQq/d2
F = qE q is the test charg in a field producing E electric field.
Electric field is a force per coulomb.
Voltage
Voltage is the difference in energy for a given charge. It is joules per coulomb.
Ways to express voltage: V, E, or emf (electro motive force)
V = Jouls/coulomb
Voltage is the driving force in an electrical circuit.
Circuits
Voltage: pushes electrons
Resistance: Slows electrons
Current: The number of electrons that flow due to voltage and resistance.
Ohms Law
V =IR
Series Formulas
|