Example 1
A 1,000 µF capacitor at 12 V stores 0.072 J.
Mendeleev
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Physics tools › Energy stored in a capacitor
Mendeleev · Physics
Energy stored in a capacitor
A charged capacitor stores energy in its electric field. Stored energy grows with capacitance and with the square of voltage.
Formula usedE = ½CV²
Visual cue · field / circuit
Calculate
Energy stored in a capacitor
What do the symbols mean?
Eenergy
Ccapacitance
Vvoltage
Two worked examples
Example 2
Doubling voltage while keeping capacitance fixed multiplies the stored energy by four.
Good to knowThe expression uses the voltage across the capacitor.