Electrical Formulas AC & DC Circuits (Single-φ & 3-φ) We can Find the Following Quantities by Using Below Formulas Chart 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. Amperes when kW s Known Amperes when Motor HP is known.