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- The acronym SQCDP comprises the five general performance factors that define optimal manufacturing operations. In other words, the visual tools provide information regarding S afety, Q uality, C ost, D elivery, and P eople.
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Q is the I 2 *X or Reactive power measured in volt-amperes reactive, VAr; S is the I 2 *Z or Apparent power measured in volt-amperes, VA; Φ is the phase angle in degrees. The larger the phase angle, the greater the reactive power; Cos(Φ) = P/S = W/VA = power factor, p.f. Sin(Φ) = Q/S = VAr/VA; Tan(Φ) = Q/P = VAr/W
- Reactive Power. We know that reactive loads such as inductors and capacitors dissipate zero power, yet the fact that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power.
- True Power. The actual amount of power being used, or dissipated, in a circuit is called true power, and it is measured in watts (symbolized by the capital letter P, as always).
- Apparent Power. The combination of reactive power and true power is called apparent power, and it is the product of a circuit’s voltage and current, without reference to phase angle.
- Calculating for Reactive, True, or Apparent Power. As a rule, true power is a function of a circuit’s dissipative elements, usually resistances (R). Reactive power is a function of a circuit’s reactance (X).
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