We finish with the formula for deriving the current from the power in three-phase installations with phase-neutral voltage: I (A) = P (W) / ( √3 × PF × V F-F(V) ) Phase neutral voltage If you have a three-phase installation and you want to calculate amperes from Watts knowing the phase-to-phase voltage, this is the formula to apply: The formula to be used in each case is detailed below: Voltage phase phase In three-phase installations, we have to differentiate between phase-to-phase and phase-to-neutral voltage. typical power factors although we recommend that you use the exact one so that the calculations are as accurate as possible: Device Please note that the power factor of a purely resistive load is equal to 1. If the explanation is not very clear, this is the mathematical formula that summarizes the above expression: If our electrical installation uses single-phase alternating current If a single-phase power supply is used, then we can calculate the phase current in Amperes by dividing the power P in Watts (W) by the product formed by the power factor multiplied by the voltage in Volts. If you do not know the voltage value, it may be that the Ohm's Law can help you if you know the resistive value of the device. This can be seen in the following mathematical formula: The current or intensity in Amperes is equal to the power in Watts (W) divided by voltage in Volts. Here's how you can to obtain the intensity or electric current from power on direct current (DC) or alternating current (AC) lines Direct current lines P (W) = I (A) x V (V) = 1A x 1V = 1W How to convert from Watts to Amps If we take into account Ohm's law, we could represent it as follows: Your unit is represented by the letter Wso that one watt represents the electrical power produced by 1V and 1A of current.
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