Capacitors - Energy Stored

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Capacitor - Energy Stored

The energy stored in a capacitor can be expressed as

W = 1/2 C V²         (1)

where

W = energy stored (Joules)

C = capacitance  (Farad)

V = potential difference (Voltage)

Capacitor - Power Generated

Since power is energy dissipated in a time - the potential power generated by a capacitor can be expressed as

P = W / t         (2)

where

P = potential power (Watts)

t = dissipation time (s)

Example - Capacitor, energy stored and power generated

The power stored in a 10 μF capacitor charged to 230 V can be calculated as

W = 1/2 (10 10^-6 F) (230 V)²

    = 0.26 Joules

If the energy is dissipated within 5 μs the potential power generated can be calculated as

P = (0.26 Joules) / (5 10^-6 s)

    = 52000 W

    = 52 kW

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