Energy in Capacitors
Home Electrostatics Coulomb's Law Electric Field Gauss's Law Electric Potential Energy Electric Potential Capacitors Energy in Capacitors Current Electrical Power and Resistors Kirchhoff's Rules RC Circuits Magnetic Fields Moving Charges in a B-Field Magnetic Field of a Moving Charge Magnetic Field Due to a Current Ampere's Law



Phys 4, Section 2                                                                    Feb 1, 2002 

Energy Storage in Capacitors

V = Q/C and dW = v dq = q dq/C. So the work W to charge a capacitor C to Q is

Electric Field Energy

If the work done in charging the capacitor is viewed as producing energy, this energy can be seen as stored in the capacitor (U = CV2/2) or in the electric field. If the energy U is divided by the volume Ad of space between the capacitor plates, then the space can be considered to have an energy density u given by


Last modified on February 05, 2002