Electronics Tools: ElectroCalc is a free application that contains many formulas and graphs that can be used for a variety of purposes. These include calculating the current, voltage, and resistance in a circuit, finding the power of a circuit, and calculating the resistance of a circuit. You can also use these formulas to calculate the potential difference across two different voltage sources, as well as the potential and current at any given point in a circuit. This application is useful for all those who are interested in the field of electronics and who wish to learn more about the subject.