To Find Amps from kW Basic Formula Calculations In DC and AC Circuits [Single, Three Phase]

In this post, you'll learn the formulas to find amps from kW in dc, single phase ac, and three phase ac circuits.

Learn other top 100 useful Basic Electrical Engineering formulas

DC Calculation formula

I(DC) = [kW * 1000] / E 

Calculate the current passing through 5 kW DC Motors having rated voltage of 40 V.

I = [kW * 1000] /E = 5000 / 40 = 125 A

Single Phase AC Calculation formula

I(1φ AC) = [kW * 1000] / [E * PF]

Calculate the current passing through 2 kW, single phase ac motor having PF 0.8. Rated voltage is 220 V.

I = [kW * 1000] / [E * PF] = 2000 / [220 * 0.8] = 11.36 A

Three Phase AC Calculation formula

I(3φ AC) = [kW * 1000] / [E * PF]

Calculate the current passing through 2.5 kW, three phase ac motor having PF 0.8. Rated voltage is 400 V.

I = [kW * 1000] / [E * PF] = 2500 / [400 * 0.8] = 7.8125 A