Energy Calculator
Energy StorageCalculator
Calculate energy (Joules), charge (Coulombs), and theoretical discharge time. Essential for pulse power, flash circuits, and backup power design.
Calculation Parameters
Enter values to calculate energy
V
W
For theoretical discharge time calculation
Enter capacitance and voltage to calculate
Governing Equations
Energy (Joules)
E = ½CV²Charge (Coulombs)
Q = CVDischarge Time
t = E / PTime Constant
τ = RCEngineering Insights
Energy scales exponentially with voltage (E ∝ V²). For high-density energy storage, increasing operating voltage is often more efficient than increasing capacitance.
Hold-Up Time Design
For power supply applications, useful energy is the difference between initial and minimum operating voltage:
E = 0.5 × C × (V²start - V²min)Safety Considerations
- •Capacitors above 50V can deliver lethal currents. Always install bleed resistors for discharge.
- •Electrolytic capacitors exhibit dielectric absorption—they can recover voltage after being shorted.
- •Always verify capacitor polarity before connecting power to electrolytic types.
Related Resources
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