ELECTRICAL
/ MECHANICAL
APPLICATION FORMULAS
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Power - AC Circuits, Power - DC Circuits,
Mechanical, Fans & Blowers, Pump Motors |
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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 |
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Abbreviations:
Eff. = Efficiency
PF = Power Factor
KW = Kilowatts
HP = Horsepower |
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| Efficiency = |
746 x Output HP
Input Watts |
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| 3ÿ KW = |
Volts x Amps x PF x 1.732
1000 |
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| 3ÿ Amps = |
746 x HP
1.732 x Volts x Eff. x PF |
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| 3ÿ Eff. = |
746 x HP
1.732 x Volts x Amps x PF |
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| 3ÿ PF = |
Input Watts
Volts x Amps x 1.732 |
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| 1ÿ KW = |
Volts x Amps x PF
1000 |
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| 1ÿ Amps = |
746 x HP
Volts x Eff. x PF |
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| 1ÿ Eff. = |
746 x HP
Volts x Amps x PF |
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| 1ÿ PF = |
Input Watts
Volts x Amps |
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| HP (3ÿ) = |
Volts x Amps x 1.732 x Eff. x PF
746 |
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| HP (1ÿ) = |
Volts x Amps x Eff. x PF
746 |
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1 KW = 1000 Watts |
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POWER - DC CIRCUITS |
| Watts = |
Volts x Amps |
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| Amps = |
Watts
Volts |
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| HP = |
Volts x Amps x Eff.
746 |
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MECHANICAL |
| Torque = |
HP x 5250
RPM |
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(Result is lb.ft. Multiply by 12 for lb.in.)
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| Torque = |
HP x 63025
RPM |
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(Result is in lb.in. Divide by 12 for lb.ft.)
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| HP = |
Torque (lb.ft) x RPM
5250 |
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| HP = |
Torque (lb.in.) x RPM
63025 |
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| 1 HP = |
3 lb. ft. @ 1750 RPM |
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| 1 HP = |
36 lb.in. @ 1750 RPM |
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| FAN AND
BLOWER MOTORS |
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Abbreviations:
CFM = Cubic Feet per Minute
Pressure lb.in./ sq.ft.
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| HP = |
CFM x Pressure
33000 x Eff. |
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PUMP MOTORS |
Abbreviations:
GPM - Gallons per Minute
S.G. - Specific Gravity
Eff. = Pump Efficiency |
| HP = |
GPM x Head in Feet x S.G.
3960 x Eff. |
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| Head in Feet = |
2.31 P.S.I.G. |
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