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The power dissipated in an electric circuit is given by the expression P RI2 where...

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Algebra

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The power dissipated in an electric circuit is given by the expression P RI2 where R is the resistance of the circuit and I is the current through the circuit For a sinusoidal alternating current the current might be represented by the relation I A sin 27ft where A is the amplitude f is the frequency and t is time Write an expression for P involving the sine function and use a fundamental identity to write P in terms of the cosine function OPRA sin 2 ft P RA RA cos 2 ft OP RA sin 2 ft P RA cos 2 ft OPRA sin 2 ft P RA cos 2nft P RA sin 2 ft P RA RA cos 2uft

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