Energy stored in a capacitor
Description
Capacitance is the ability of a body to store an electrical charge. Any object that can be electrically charged exhibits capacitance. A common form of energy storage device is a parallel-plate capacitor. The energy stored in a capacitor is equal to the work done to charge it. For a flat-plate capacitor the energy stored is directly proportional to the surface area of the conductor plates and inversely proportional to the separation distance between the plates.
Related formulasVariables
Wstored | Energy stored in the capacitor (J) |
ϵr | The relative static permittivity of the material between the plates (for a vacuum, εr = 1) (dimensionless) |
ϵ0 | electric constant |
A | The area of overlap of the two plates (m2) |
d | The separation between the plates (m) |
V | The voltage (V) |