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Question 1: demonstration

The conservation of the instantaneous power leads to:

As we know:

The term corresponding to

consists of

  • a continuous component

  • a component with a pulsation

The term corresponding to

consists of

  • a component with a pulsation

  • a component with a pulsation

The term corresponding to

leads to

  • a component with a pulsation

  • a component with a pulsation

By regrouping the terms we obtain:

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Last update: 2005, September, 30 | Translation: Sergiu Ivanov