Question

Why the concept of avarage power is useful?

Answer 1

In physics, power is the rate of doing work or transferring heat, the amount of energy transferred or converted per unit time.

In the International System of Units, the unit of power is the joule per second (J/s), known as the watt in honour of James Watt, the eighteenth-century developer of the condenser steam engine.

Answer 2

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The average power (often simply called "power" when the context makes it clear) is the average amount of work done or Energy transferred per unit time.

Average optical power is a useful indicator of system performance, and thus is often used for maintenance and control purposes.

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