免费电容储能计算器

计算电容器中存储的电能E=½CV²。

μF
V

储存能量

0.072000 J

Stored Energy (mJ)72.000 mJ

Stored Energy vs Capacitance

公式

## Energy in a Capacitor A charged capacitor stores energy in its electric field. ### Formula **E = (1/2) * C * V²** This energy is released when the capacitor discharges. Doubling the voltage quadruples the stored energy.

计算示例

A 1000 μF capacitor charged to 12 V.

  1. 01E = 0.5 * C * V²
  2. 02E = 0.5 * 1000e-6 * 12²
  3. 03E = 0.5 * 0.001 * 144
  4. 04E = 0.072 J = 72 mJ

常见问题

Why does energy scale with voltage squared?

As voltage increases, both the stored charge and the voltage across the capacitor increase, giving a quadratic relationship.

Can a capacitor replace a battery?

Supercapacitors can store significant energy for short bursts, but batteries store far more energy per unit mass for sustained delivery.

Is it dangerous to discharge a charged capacitor?

Large capacitors at high voltages can store lethal amounts of energy. Always discharge capacitors safely before handling.

学习

Understanding Newton's Laws of Motion

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