Download - Power Relationships
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Power RelationshipsPower Relationships
P = watts
S = volt-amps
Q = volt-amps of reactance
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Power RelationshipsPower Relationships
Resistance (R).
Inductance Reactance (XL)
Capacitance Reactance (Xc)
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Reactive PowerReactive Power
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
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True PowerTrue Power
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
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Apparent PowerApparent Power
Combined effect of Power and Reactive Power
Measured in volt-amps Units VA
Symbol is S
S=E x I
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Power Factor Power Factor
Ratio between power and apparent power
P.f. = P/S
Require the angle (θ) Angleθ = cos-1p.f
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Power TrianglePower Triangle
POWER TRIANGLE
LAGGING WATTS
VO
LT
AM
PS
RE
AC
TIV
E
WATTS
VO
LT
AM
PS
CA
PA
CIT
IVE
POWER TRIANGLE
LEADING
P =
Q =
P =
Q =