Watt's law

例句：

1. 1. The law of conservation of energy states that energy cannot be created or destroyed, only transformed.
   能量守恒定律表明，能量不能被创造或销毁，只能转化。
2. 2. This is a fundamental principle in thermodynamics, which explains how heat flows from hotter tocooler objects.
   这是热力学的一个基本原理，解释了热量如何从热的物体流向冷的物体。
3. 3. In the context of electrical engineering, Watt's law is used to calculate the power output of an electric motor.
   在电气工程的背景下，瓦特定律用于计算电动机的功率输出。