Energia Capacitor
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
This capacitor energy calculator helps determine the stored energy in a capacitor, given its capacitance and applied voltage. The formula used is U = ½·C·V², where U is the stored energy in joules (J), C is the capacitance in farads (F), and V is the voltage in volts (V).
The energy stored in a capacitor is a measure of its ability to store electric charge. It directly depends on the capacitor's capacitance and the square of the applied voltage. This means small voltage variations can result in large changes in stored energy.
This tool is useful in contexts such as electronic circuit design, energy storage systems, and RC circuit analysis. However, it's crucial to remember that the actual stored energy can be affected by factors like the capacitor's internal resistance and current frequency.
When using this tool, it's essential to be careful with measurement units. Ensure that capacitance is in farads (F) and voltage is in volts (V) to get the energy in joules (J).
Frequently asked questions
What is the stored energy in a capacitor?
The stored energy in a capacitor is its ability to store electric charge, measured in joules (J).
How does voltage affect stored energy?
Stored energy is directly proportional to the square of the applied voltage. Increases in voltage result in significant increases in stored energy.
What are the required measurement units?
Capacitance in farads (F) and voltage in volts (V) to get the energy in joules (J).
When should I use this calculator?
In electronic circuit design, energy storage systems, and RC circuit analysis.
What factors can affect actual stored energy?
Capacitor's internal resistance and current frequency.