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'Power' is a rate; it simply tells us how much energy is being consumed per unit time. In SI, a 'watt' is a special name given to a 'joule per second'. So a 10-W lamp is consuming energy at the rate of 10 J/s (joules per second).

It is incorrect to say that 'power flows'. It's energythat 'flows', power simply tells us how quickly energy flows. You can think of 'power' as being equivalent to 'speed'; you would never ever say that 'kilometre per hour' flows, so you can't say that a 'watt' flows!

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