In an AC circuit having a resistor R, an inductor L, and a capacitor C, the voltage across the circuit is generally different from the phase of the current therein. If the parameters of the circuit components (L or C) or the power supply frequency are adjusted, they can be made to have the same phase, and the entire circuit appears to be purely resistive. To adjust the parameters of L or C, an accurate calculation is required. With this tool, calculations are fast and accurate.