Calculator · Electrical Engineering
Capacitor Energy Calculator
A charged capacitor stores E = ½·C·V². Pick which two quantities you know; the other two follow. Any two of C, V, Q and E fix the capacitor, except combinations that cannot fix C.
Inputs
Energy is never negative. From C and E only the voltage magnitude is recoverable, so the positive value is reported.
Results
Stored energy E = ½·C·V²
146.9 mJ
| Capacitance C | 470 µF |
|---|---|
| Voltage V | 25 V |
| Charge Q = C·V | 11.75 mC |
| Energy E | 146.9 mJ |
Explore in the Lab
Open this capacitor in the Capacitors & Transients Lab
The Lab holds C at V, so the energy view shows the same stored energy.
Technical reference
E = ½·C·V²
E = Q²/(2C) = ½·Q·V
Q = C·V
- E
- stored energy (≥ 0)[J]
- C
- capacitance (> 0)[F]
- V
- voltage[V]
- Q
- charge[C]
(Q, V) needs Q and V non-zero with the same sign; (Q, E) and (V, E) need non-zero values, otherwise C cannot be determined.