

Trinity Technologies  Electric Formulas
E = Voltage / I = Amps /W = Watts / PF = Power Factor Eff = Efficiency /
HP = Horsepower
AC/DC Formulas

To Find

Direct Current

AC / 1phase
115v or 120v

AC / 1phase
208,230, or 240v

AC 3 phase
All Voltages

Amps when
Horsepower is Known

HP x 746
E x Eff

HP x 746
E x Eff X PF

HP x 746
E x Eff x PF

HP x 746
1.73 x E x Eff x PF

Amps when
Kilowatts is known

kW x 1000
E

kW x 1000
E x PF

kW x 1000
E x PF

kW x 1000
1.73 x E x PF

Amps when
kVA is known


kVA x 1000
E

kVA x 1000
E

kVA x 1000
1.73 x E

Kilowatts

I x E
1000

I x E x PF
1000

I x E x PF
1000

I x E x 1.73 PF
1000

KilovoltAmps


I x E
1000

I x E
1000

I x E x 1.73
1000

Horsepower
(output)

I x E x Eff
746

I x E x Eff x PF
746

I x E x Eff x PF
746

I x E x Eff x 1.73 x PF
746

Three Phase Values

For 208 volts x 1.732, use 360
For 230 volts x 1.732, use 398
For 240 volts x 1.732, use 416
For 440 volts x 1.732, use 762
For 460 volts x 1.732, use 797
For 480 Volts x 1.732, use 831

E = Voltage / I = Amps /W = Watts / PF = Power Factor Eff = Efficiency
HP = Horsepower
AC Efficiency and Power Factor Formulas

To Find

Single Phase

Three Phase

Efficiency

746 x HP
E x I x PF

746 x HP
E x I x PF x 1.732

Power Factor

Input Watts
V x A

Input Watts
E x I x 1.732

Power  DC Circuits

Watts = E xI

Amps = W / E

Ohm's Law / Power Formulas


P = watts
I = ampsR = ohms
E = Volts


