Resources Your Company Can Use Today!
Useful Formulas
OHMS LAW
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Ohms = Volts Amperes
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Amperes = Volts Ohms
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Volts = Amperes x Ohms
POWER - A.C. CIRCUITS
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Power Factor = Watts (Volts x Amperes)
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Three Phase Kilowatts = (Volts x Amperes x Power Factor x 1.732) 1000
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Three Phase Volt-Amperes = Volts x Amperes x 1.732
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Three Phase Amperes = (746 x Horsepower) (1.732 x Volts x Efficiency x Power Factor)
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Single Phase Kilowatts = (Volts x Amperes x Power Factor)1000
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Single Phase Amperes = (746 x Horsepower) (Volts x Efficiency x Power Factor)
POWER - D.C. CIRCUITS
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Watts = Volts x Amperes
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Amperes = Watts Volts
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Horsepower = (Volts x Amperes x Efficiency) 746
MOTOR APPLICATION FORMULAS
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Torque (lbs.-ft.) = (Horsepower x 5250) RPM
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Shaft Stress (lbs. per sq. inch) = (Horsepower x 321000) (RPM x Shaft Diam3)
FOR PUMPS
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Horsepower = (GPM x Head in Feet x Specific Gravity) (3960 x Efficiency of Pump)
FOR FANS & BLOWERS
- Horsepower = (CFM x Pressure (lbs. per sq. ft.)) (33000 x Efficiency
SPEED
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Synchronous RPM = (Hertz x 120) Poles
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Percent Slip = (Synchronous RPM - Full Load RPM) Synchronous RPM x 100
