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Power Equation of Ohm’s Law and Joule’s Law . P = √3 x V L x I L x Cos Ф; P = 3 x V Ph x I Ph x Cos Ф; P = 3 x I 2 x R x Cos Ф; P = 3 (V 2 / R) x Cos Ф; Where: DC Power Formula. The SI unit of power is watt, one joule per second. We have used for the below formula to find DC voltage, DC current, DC Power and Resistance, Amperes when kW s Known; Amperes when Motor HP is known. Because power is a function of voltage multiplied by current, and both voltage and current doubled from their previous values, the power will increase by a factor of 2 x 2, or 4. Formula ; Electric power is defined as the rate, per unit time, at which an electric circuit transfers its electrical energy. P (W) = Real power in Watts. Divide the peak voltage by the square root of two to obtain the RMS voltage, which is equivalent to the required DC voltage. P = V x I x Cos Ф; P = I 2 x R x Cos Ф; P = V 2 / R (Cos Ф) Power Formulas in Three Phase AC Circuits. DC Power formula: Let us consider. DC power calculation. P = V x I; P = I 2 x R; P = V 2 / R; Power Formulas in Single Phase AC Circuits. R (Ω) = Resistance in Ohms. Voltage (V) calculation from current (I) and resistance (R): V (V) = I (A) × R (Ω) Complex power (S) calculation from voltage (V) and current (I): P (W) = V (V) × I (A) = V 2 (V) / R (Ω) = I 2 (A) × R (Ω) AC power calculator. V (V) = Voltage in Volts. I (A) = current in Amps. This page shows you the DC power formula to calculate the power in a given circuit using the values of voltage and ampere. A simple online DC power calculator to find out the power from the given values of voltage and current. Power is the product of voltage and the current. Enter 2 magnitudes + 2 phase angles to get the other values and press the Calculate button: Electrical Formulas in DC; Full load Current in Amperes (Alternating Current AC Motors) Alternating Current AC (Single-φ & 3-φ) Finding Motor Hp ( Horse Power), kVA (kilo-Volt Ampere) kW input, When Motor HP is known; kW (kilowatts) Amperes, when kVA is known. It is … Power, Voltage and Current are always inter-dependant to each other. RMS Equation for AC to DC Conversion: If we know the peak voltage of an AC, we can quickly figure out the necessary DC voltage. You can check this by dividing 432 watts by 108 watts and seeing that the ratio between them is indeed 4. DC Circuit Equations and Laws Chapter 1 - Useful Equations And Conversion Factors PDF Version. Basic Electric Power Formula in AC & DC Circuits Power Formulas in DC Circuits. NOTE: the symbol “V” (“U” in Europe) is sometimes used to represent voltage instead of “E”.