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The real Watt's law is a hypothesis that states the sum of the latent heat of steam at any temperature of generation and the heat required to raise water from 0°C to that temperature is constant. It has been proven to be incorrect.

However electricity amateurs and even some instructors often incorrectly describe Watt's Law as stating P=VI (or P=IE). This is actually called "Power Law". The term "Watt's Law" is INCORRECT and should not be used here.

Read more: What_is_watts_law_and_component

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