ELECTRICAL / MECHANICAL APPLICATION FORMULAS

Power - AC Circuits, Power - DC Circuits, Mechanical, Fans & Blowers, Pump Motors

OHMS LAW
Volts (E) = Amps (I) x Ohms (R)
Amps (I) = Volts (E) / Ohms (R)
Ohms (R) = Volts (E) / Amps (I)
R=Ohms, E=Volts, I=Amperes

POWER - AC CIRCUITS Eff. = Efficiency, PF = Power Factor, KW = Kilowatts, HP = Horsepower
Efficiency	=	746 x Output HP Input Watts		3ø KW	=	Volts x Amps x PF x 1.732 1000
3ø Amps	=	746 x HP 1.732 x Eff. x PF		3ø Eff.	=	746 x HP 1.732 x Volts x Amps x PF
3ø PF	=	Input Watts Volts x Amps x 1.732		1ø KW	=	Volts x Amps x PF 1000
1ø Amps	=	746 x HP Volts x Eff. x PF		1ø Eff.	=	746 x HP Volts x Amps x PF
1ø PF	=	Input Watts Volts x Amps		HP (3ø)	=	Volts x Amps x 1.732 x Eff. x PF 746
HP (1ø)	=	Volts x Amps x Eff. x PF 746		1 KW = 1000 Watts

POWER - DC CIRCUITS Eff. = Efficiency, HP = Horsepower
Watts	=	Volts x Amps		Amps	=	Watts Volts
HP	=	Volts x Amps x Eff. 746

MECHANICAL Torque in lb. ft., RPM=Revolutions Per Minute, HP = Horsepower
Torque	=	HP x 5250 RPM Result is lb.ft. Multiply by 12 for lb.in.		HP	=	Torque X RPM 5250
1 HP	=	36 lb.in. @ 1750 RPM		1 HP	=	3 lb. ft. @ 1750 RPM

FAN AND BLOWER MOTORS CPM = Cubic Feet per Minute, Pressure in lb. / sg. ft., Eff. = Efficiency
HP	=	CFM x Pressure 33000 x Eff.

PUMP MOTORS GPM = Gallons per Minute, S.G. = Specific Gravity, Eff. = Efficiency of Pump
HP	=	GPM x Head in Feet x S.G. 3960 x Eff.		Head in Feet	=	2.31 P.S.I.G.