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Power Relationships

Power Relationships. P = watts S = volt-amps Q = volt-amps of reactance. Power Relationships. Resistance (R). Inductance Reactance (XL) Capacitance Reactance (Xc). Rate at which energy is being stored and returned to the ckt Inductance temporally stores energy

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Power Relationships

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  1. Power Relationships P = watts S = volt-amps Q = volt-amps of reactance

  2. Power Relationships • Resistance (R). • Inductance Reactance (XL) • Capacitance Reactance (Xc)

  3. Rate at which energy is being stored and returned to the ckt Inductance temporally stores energy Capacitors temporally store energy Measured in Volt-amps of Reactance Units VARS Symbol is Q Q=Ex x Ix Reactive Power

  4. Rate at which energy is dissipated or consumed in the CKT The load of the ckt ex motor, light Measure in Watts Units are W Symbol is P P=Er x Ir True Power

  5. Combined effect of Power and Reactive Power Measured in volt-amps Units VA Symbol is S S=E x I Apparent Power

  6. Ratio between power and apparent power P.f. = P/S Require the angle (θ) Angleθ = cos-1p.f Power Factor

  7. Power Triangle

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