Capacitor Energy Calculator
Energy from Capacitance & Voltage
Energy from Charge & Capacitance
Formula
E = ½CV² = ½QV = Q²/(2C), where E is energy in joules, C is capacitance in farads, V is voltage in volts, and Q is charge in coulombs.
Frequently Asked Questions
How is energy stored in a capacitor?
Energy is stored in the electric field between the capacitor's plates. As charge accumulates on the plates, the electric field grows, storing more energy. The energy equals ½CV².
What happens to the energy when a capacitor discharges?
When a capacitor discharges, the stored electrical energy is converted into other forms such as heat (in a resistor), light, or work done on a circuit. The energy is fully released when the voltage drops to zero.
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