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Derive expression P = Vrms Irms cosδ for an A.C. circuit |
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Answer» ith Explanation:Assume that the alternating voltage given by The resulting alternating CURRENT in the CIRCUIT be with a phase change of Ф, LET Ф=p and amplitude be I ;THEREFORE power P at any INSTANT is we can write as where z is impedance.z is given by ∠δ in phasor, where δ is same as phase difference between current and voltage in the circuit.The power in phasor form given by ∠δ.where |p|= is therefore,rewriting the phasor, we can write power as δ |
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