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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



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POWER - AC CIRCUITS
Horizontal Line
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
Horizontal Line
Eff. = Efficiency, HP = Horsepower

Watts = Volts x Amps Amps = Watts

Volts
HP = Volts x Amps x Eff.

746
 
 

 
MECHANICAL
Horizontal Line
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
Horizontal Line
CPM = Cubic Feet per Minute, Pressure in lb. / sg. ft., Eff. = Efficiency

HP = CFM x Pressure

33000 x Eff.
 
 

 
PUMP MOTORS
Horizontal Line
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.
 










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Last Revision: 10/15/99