> [!summary]
Conservation of energy is a law that states the energy before and after in a closed system is the same.
>
**Key Equation:**
>
Conservation of energy:
$\Delta E =0$
>[!info]+ Read Time
**⏱ 1 min**
# Definition
The conservation of energy is a fundamental law proven through experiments. It states that the total [[Energy|energy]] in a [[Closed system|closed system]] is always conserved. Mathematically, this is saying that the energy before and after must be the same
$
E_{i} = E_{f}
$
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