Electrical Calculator Electrical Calculator Calculate using Ohm's Law and Power Formulas Calculator Type Resistance R = V / I Power P = V × I Voltage V = I × R Current I = V / R Voltage (V) Current (A) Calculate Reference Formulas Ohm's Law • V = I × R (Voltage) • I = V / R (Current) • R = V / I (Resistance) Power CalculationsPower Calculations • P = V × I (Power) • P = I² × R (Power) • P = V² / R (Power)