The current I in amps is equal to the square root of the power P in watts divided by the resistance R in ohms. It is also possible to convert watts to amps if the resistance of a simple resistive circuit is known by using this formula: This formula calculates the current for all three wires in a three-phase system to find the current for a single wire, you’ll need to divide the result by three. The current I in amps is equal to the power P in watts divided by the product of line to neutral voltage V in volts, the power factor PF, and 3. Note that this formula measures the current draw for a single pair of wires in a three-phase system to calculate the current for all three pairs, you need to multiply the result by three.įor three-phase AC circuits where the line to neutral voltage is known, the formula to convert watts to amps is: The current I in amps is equal to the power P in watts divided by the product of line to line voltage V in volts, the power factor PF, and the square root of 3. Use the formulas below for line to line or line to neutral RMS voltages in a three-phase circuit.įor three-phase AC circuits where the line to line voltage is known, the formula to convert watts to amps is: The formulas to convert watts to amps for three-phase AC circuits are a bit different from the single-phase and DC formulas. ![]() ![]() If you want to learn more about calculating power factor, try our power factor calculator. In other words, the current I in amps is equal to the power P in watts divided by the product of voltage V in volts and the power factor PF. So, a 2,000-watt heater will draw 8.33 amps of current at 240 volts.Ĭonverting real watts to amps for a single-phase AC circuit with a power factor uses a slightly different formula. For example, let’s calculate the current draw of a 2,000-watt electric heater at 240 volts.
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