kW to Amps Formula | kilowatt to Ampere Formulas

kW to amps formula is used to calculate amperes from kilowatts. We can calculate current in DC, Single phase, two-phase, and three-phase circuits when the kilowatts are known.

where kW = kilowatt

E = voltage

PF = Power factor

DC kilowatts to Amps Formula

The equation used to calculating dc current from kilowatts is:

I = (kW * 1000)/E

Example 1: A 100 kW, 400 V dc generator powers a conveyor belt in a cement power plant. Calculate the amps.

Solution: I = (100 * 1000) / 400 = 250 Amps

Single phase kilowatts to amps formula

Single phase amps is a ratio of kilowatts * 1000 and voltage times PF:

I = (kW * 1000)/(E * PF)

Example 2: A 10 kW, 100 single phase motor operates at a PF of 85%. Calculate the single phase current.

Solution: I = (10 * 1000) / (100 * 0.85) = 117.64 Amps

Two-phase AC kilowatts to amps formula

Two-phase AC kilowatts is a ratio of kilowatts * 1000 to E * PF * 2.

I = (kW * 1000)/(E * PF * 2)

Example 3: A two-phase 20 kW, 250 V circuit is working at 0.88 PF. Find the amps.

Solution: I = (20 * 1000) / (250 * 0.88 * 2) = 45 Amps

Three-phase AC kilowatts to amps formula

Three-phase AC kilowatts is ratio of kilowatts * 1000 to E * PF * 1.73. Where 1.73 is an approximate for √3.

I = (kW * 1000)/(E * PF * 1.73)

Example 4: A three-phase 18 kW, 440 V circuit powers load at the power factor of 0.9. Calculate the amps.

Solution: I = (18 * 1000) / (440 * 0.9 * 1.73) = 26.27 Amps