Voltage Divider Calculation

The divider can be used in an electrical circuit to take only a portion of the input voltage, as well as to read data from sensors. The calculation of the voltage divider is done to find out what the voltage will be in the circuit with such an element, based on the input voltage, resistor resistance indicators, and capacitor capacitance.

Typical calculation of the divider is done using the formula U1/U2 = R1/R2 according to Ohm's Law. The basic circuit can be more complex, and the resistance indicators themselves can change, being linear/non-linear or active or reactive.

In the classical understanding, the divider is a circuit with two resistors connected in series, providing two resistances when working with a voltage source. As a result, when turned on, the voltage is split in half; the connection point is considered the middle. When an additional resistance is connected in parallel, the total resistance of the arm decreases, its definition requires additional calculations. To determine the resistance readings with the help of a calculator, the following parameters must be specified:
• Input and output voltage.
• Series of Resistors (you need to choose between E24 and E96 from the dropdown list).
• Units in Ohms (the list includes indicators from 1 to 1000000 Ohms).
After that, you need to press the button «Calculate», and the program will output the indicators R1 and R2, designated in Ohms, and the percentage of error.