could you answer my questions about VAR ? 1. what phase angle between current and voltage makes power inside LCR circuit fully VAR ? 2. if current and voltage are in phase , does it mean that cos(phi angle) = 1 and power is fully REAL? 3. what if phase angle is 180 degrees ?
Forest, To my understanding: 1. what phase angle between current and voltage makes power inside LCR circuit fully VAR ? 90° as Cos(90) = 0 2. if current and voltage are in phase , does it mean that cos(phi angle) = 1 and power is fully REAL? yes as cos(0) = 1 3. what if phase angle is 180 degrees ? Not sure this is possible, but cos(180) = -1 whatever that means. All, Considering a parallel LCR circuit in resonance, the phases between V and I will be as picture 1 considering a series LCR circuit in resonance, the phases between V and I will be as picture 2 So real power only when V and I are in phase (0°). What about combining a series and parallel LCR circuit as proposed? Would there not be next to the real Ur and Ir in phase situations (real power) also not some real Uc and Ic in phase (cross LCR / cross picture) situations like depicted by the green vertical line? (and UL and IL) Is that what forest could mean? Not sure how to combine those LCR circuits though. Itsu
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