![]() This formula measures the current draw for one pair of wires in the three-phase system to calculate the current for all three pairs of wires, you need to multiply the result by three. Use one of the formulas below for line to line or line to neutral RMS voltages. ![]() The formulas to convert kilowatts to amps for a three-phase AC circuit are a little different from the formula for a single-phase circuit. How to Find the Current of a Three-Phase AC Circuit In this example, the 5 kW motor will draw 34.72 amps of current. Try our power factor calculator to get the power factor if needed.įor example, let’s find the current of a 5 kW motor with an efficiency of 75% and power factor of 0.8 at 240 volts. The current I in amps is equal to the power P in kilowatts divided by the voltage V in volts times the efficiency η times the power factor PF. To find the input current required to achieve a certain motor output power accounting for power factor and efficiency, use the following equation. The magnitude of real and reactive together in alternating current power is called the apparent power, and the power factor is the ratio of real power to apparent power. Thus, the current I in amps is equal to the power P in kilowatts divided by the voltage V in volts times the efficiency η. To find the input current required to achieve a certain motor output power, use the following equation. Efficiency of the motor η, is defined as the ratio of power output to power input. How to Account for Motor Efficiency and Power FactorĮquipment is often not 100% efficient with power usage, and this must be factored in to find the number of amps consumed for a given output power. So, generating 1 kW of power at 120 volts will draw 8.33 amps of current. RLC Resonance frequency calculator: A useful electronics tool for finding the frequency at which a circuit resonates.For example, find the current of a circuit with 1 kW of power at 120 volts. Solution: I = / = 80.28 Aģ Phase Induction Motor current calculator: A useful calculator to find the FLA and RLA in 3 phase induction motorĮlectricity bill calculator: Used to find the cost of appliances in your bill.Ĥ Band Resistor color code calculator: A useful tool for decoding 4 band resistors.ĥ Band Resistor color coding calculator: Provides the value of 4 band resistor. Find the current if the power factor is 0.9. Three phase kW to Amps calculations involve a ration of 1000 times kW to the power factor times voltage and an additional factor 1.73 that represents an equivalent of √3 and is added because the circuit is three phase in nature.Įxample: A 3 phase 400 volt circuit has a 50 kW load connected to it. Solution: I = / = 31.25 A Three phase kW to Amps Here the formula is identical to the previous one with the difference being a 2 is introduced in the denominator.Įxample: A 200 volt, two-phase circuit operating at 0.8 PF is loaded with 10 kW load. Solution: I = / = 196 A Two-phase kW to Amps The system is operating at 0.85 power factor. ![]() Single phase formula is a ration of thousand times kilowatts to the power factor times operating voltages.Įxample: A 120-volt single phase AC circuit has 20 kW load. The single phase and all other alternating current circuits introduce an additional concept of power factor in the denominator. Solution: I = / 100 = 500 A Single phase kW to Amps It is a ratio of 1000 times kW to the system voltages.Įxample: A 50 kW, 100-volt dc (Direct current) generator power v belt at a cement production power plant.
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