Electrical Calculator This app is a gift for all Electrical / Electronics Engineering graduates and students. Now you don't need to remember all those complex formulas. This app contains all the Electrical Engineering calculations and conversions including Voltage, Efficiency, Resistor/Capacitor/Inductor combinations, Resonant Frequency, Reactance, 4-Band, 5-Band and 6-Band Resistor Colour Coding, Inductor Colour Coding, Delta/Star Impedance Conversion, Single/Three Phase Real/Reactive/Apparent