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Amperes on the Electrical Contractor's Test

An Ampere is a measurement of current and it is represented by the letter A.

To calculate Amperes in Direct Current systems, use:

Amperes = Horsepower x 745.7 / Volts x Efficiency
I = HP x 745.7 / V x Eff

or

Amperes = KW x 1000 / Volts
I = KW x 1000 / V

To calculate amperes on single-phase, use:

Amperes = Watts / Volts x Power factor
I = P / V x Pf

Amperes = Horsepower x 745.7 / Volts
I = HP x 745.7 / V

or

Amperes Kilowatts x 1000 / Volts x Power factor
I = KW x 1000 / V x Pf

To find Amperes on three-phase, use:

Amperes = Watts / Volts x Power factor x 1.73
I = P / V x Pf x 1.73

or

Amperes = Horsepower x 745.7 / Volts x Efficiency x Power factor x 1.73
I = HP x 745.7 / V x Efficiency x Pf x 1.73

or

Amperes = Kilowatts x 1000 / Volts x Power factor x 1.73
I = KW x 1000 / V x Pf x 1.73
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Written by Yanis O.

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