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Trinity Technologies - Electric Formulas
E = Voltage / I = Amps /W = Watts / PF = Power Factor Eff = Efficiency /
HP = Horsepower
AC/DC Formulas
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To Find
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Direct Current
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AC / 1phase
115v or 120v
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AC / 1phase
208,230, or 240v
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AC 3 phase
All Voltages
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Amps when
Horsepower is Known
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HP x 746
E x Eff
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HP x 746
E x Eff X PF
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HP x 746
E x Eff x PF
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HP x 746
1.73 x E x Eff x PF
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Amps when
Kilowatts is known
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kW x 1000
E
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kW x 1000
E x PF
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kW x 1000
E x PF
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kW x 1000
1.73 x E x PF
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Amps when
kVA is known
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kVA x 1000
E
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kVA x 1000
E
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kVA x 1000
1.73 x E
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Kilowatts
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I x E
1000
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I x E x PF
1000
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I x E x PF
1000
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I x E x 1.73 PF
1000
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Kilovolt-Amps
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I x E
1000
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I x E
1000
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I x E x 1.73
1000
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Horsepower
(output)
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I x E x Eff
746
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I x E x Eff x PF
746
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I x E x Eff x PF
746
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I x E x Eff x 1.73 x PF
746
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Three Phase Values
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For 208 volts x 1.732, use 360
For 230 volts x 1.732, use 398
For 240 volts x 1.732, use 416
For 440 volts x 1.732, use 762
For 460 volts x 1.732, use 797
For 480 Volts x 1.732, use 831
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E = Voltage / I = Amps /W = Watts / PF = Power Factor Eff = Efficiency
HP = Horsepower
AC Efficiency and Power Factor Formulas
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To Find
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Single Phase
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Three Phase
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Efficiency
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746 x HP
E x I x PF
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746 x HP
E x I x PF x 1.732
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Power Factor
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Input Watts
V x A
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Input Watts
E x I x 1.732
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Power - DC Circuits
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Watts = E xI
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Amps = W / E
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Ohm's Law / Power Formulas
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P = watts
I = ampsR = ohms
E = Volts
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