Capacitance and Dielectrics
site menu
The Electric Universe, by David Bodanis

A Capacitor is a device that is used to store energy by separating charges.

Capacitance is the measure of a capacitor to store charge. The Capacitance is a property of the system and does not vary with voltage.

The capacitance of a pair of conductors depends on the geometry of the conductors

Mechanical Universe - Capacitors

Why are Coaxial Cables important to electronic applications?

Mechanical Universe - Lemon Batery

The Action Potential
it works now!
Mechanical Universe - Battery

Charging a Capacitor

The work done in charging a capacitor appears
as electric potential energy U stored in the capacitor.
This result applies to any geometry.

A dielectric is a non-conducting material. When a dielectric is inserted between the plates of a capacitor, the capacitance increases.


Electric discharge will occur if we apply an Electric Potential that produces an Electric Field that is stronger than the dielectric strength of the dielectric material.

Aligning with the Applied Electric Field

Polarized Dielectric
Induced Dipole Moment
Quick Quiz 26