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Energy Stored in a Capacitor

Physics · Class 12

The energy stored in a capacitor is the electric potential energy required to separate charge onto its plates.

u = ½ε₀E²
U=½QV
U=½CV²
U=Q²2C
Energy Density: As a capacitor charges, its voltage rises from zero to final value `V`. For charge `q` at an interm
Formula / Key Relation: **U=½QV** **U=½CV²** **U=Q²2C**
Energy is stored in the capacitor's electric-field configuration.

Free-body idea — Energy Stored in a Capacitor — original sketch for this lesson (not copied from a textbook).