ZRLC is a free Android application developed by FGV that helps users to draw and solve circuits. It is a perfect tool for those who want to learn about circuit design, or for professionals who need to calculate currents, voltages, input/output powers, and build vector diagrams.

One of the main features of ZRLC is the ability to draw circuits. Users can easily create and modify circuits with different components such as resistors, capacitors, inductors, and sources. Another great feature is the calculation of circuit parameters using Ohm's law and Kirchhoff's method of loop currents and node potentials. These calculations include finding currents, voltages, and input/output powers. Finally, the app also allows users to build vector diagrams, which is useful for visualizing circuit behavior.

Overall, ZRLC is an excellent tool for anyone interested in circuit design or analysis. Its intuitive interface, combined with its powerful calculation and drawing features, makes it a must-have for both beginners and professionals alike.