Ohms Law
Ohms = Volts/Amperes (R=E/I)
Amperes = Volts/Ohms (I=E/R)
Volts = Amperes x Ohms (E=IR)

 

Power AC Circuits
3 phase KW = Volts x Amps x Power Factor X 1.732 / 1000
3 phase Amps = 746 x Horsepower / 1.732 x Volts x Efficiency x Power Factor
3 phase Power Factor = Input Watts / Volts x Amps x 1.732
1 phase Power Factor = Input Watts / Volts x Amps

 

Power DC
Watts = Volts x Amps (W=EI)
Amps = Watts / Volts (I=W/E)
Horsepower = Volts x Amps x Efficiency / 746

 

Conversion Factors
Conversion Web Site
Centimeters x .3937 = inches
Inches x 2.54 = Centimeters
Kilometers x .6214 = Miles
Meters x 3.281 = Feet
Miles x 1.609 = Kilometers
Celsius=(Fahrenheit-32) / 1.8
Kalvin=Celsius+273

 

Motor Application
Torque (lb. - ft.) = Horsepower x 5250 / RPM
Horsepower = Torque (lb. - ft.) x RPM / 5250