With this application it will be very easy for you to perform all the required calculations and just enter 2 values ​​for example: volts and ampere and press calculate and you will get the formulas and solution in both ohms fields (resistivity) and power (current) can also choose milliamp. Tip: Click Next. It is also very easy to calculate the value of the resistors. Select 4 or 5 bars, then press the resistor and the counter value appears. Helps you develop an electric circuit.