Motor Current Ratings (Single-Phase AC) Motor current ratings based on kilowatt output at 120 and 240 volts single-phase AC with an efficiency of 0.8 and a power-factor of 1. Motor current ratings based on kilowatt output at 120, 208, 240, 277, and 480 volts three-phase AC with an efficiency of 0.8 and a power-factor of 1. This formula measures the current draw for all three wires in the three-phase system to calculate the current for a single wire, you need to divide the result by three. How to Convert Ampere to Milliampere 1 A 1000 mA 1 mA 0. I (A) = P (kW) × 1,000 / V L-N(V) × η × PF × 3 To convert ampere to milliampere (a to ma) you need to multiply ampere value with 1000. 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. Diegou Laobe bou saf nekh diongue ba neup woma 784058983 gua nieuw ma topatola soumila nap saye weene mathie. So, generating 1 kW of power at 120 volts will draw 8.33 amps of current. 200 Amp Outdoor Service Disconnect Switch. For example, find the current of a circuit with 1 kW of power at 120 volts.
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